9/30/12Water Level Indicator Circuit-Liquid Level Sensor Project Home About Datasheets Lab Manual Testing Components Electronic Circuits and Diagram-Electronics Projects and Design Search Custom Search Ads by Google Water Level Switch Circuit Board Electronic Circuit Circuit Diagram Simple Water Level Indicator jacky February - 28 - 2008 199 Comments Water Level Meters No more broken water level tapes! Try our acoustic meters risk free. www.enoscientific.com Water Level Indicator Description This is the circuit diagram of a simple corrosion free water level indicator for home and industries. In fact the the level of any conductive non corrosive liquids can be measured using this circuit. The circuit is based on 5 transistor switches. Each transistor is switched on to drive the corresponding LED , when its base is supplied with current through the water through the electrode probes. One electrode probe is (F) with 6V AC is placed at the bottom of tank. Next probes are placed step by step above the bottom probe. When water is rising the base of each transistor gets electrical connection to 6V AC through water and the corresponding probe. Which in turn makes the transistors conduct to glow LED and indicate the level of water. The ends of probes are connected to corresponding points in the circuit as shown in circuit diagram.Insulated Aluminum wires with end insulation removed will do for the probe. Arrange the probes in order on a PVC pipe according to the depth and immerse it in the tank.AC voltage is use to prevent electrolysis at the probes. So this setup will last really long. I guarantee at least a 2 years of maintenance free operation. That’s what I got and is still going. Components T1 – T5 BC 548 or 2N2222 Transistors R1-R5 2.2K 1/4 W Resistors R6-R10 22K 1/4 W Resistors D1 – D5 LED’s ( color your choice) Notes: Use a transformer with 6V 500 mA output for power supply. Do not use a rectifier! we need pure AC. Use good quality insulated www.circuitstoday.com/simple-water-level-idicator Aluminum wire for probes. If Aluminum wires are not available try Steel or Tin.Copper is the worst. Try the circuit first on a bread 1/37 9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Aluminum wire for probes. If Aluminum wires are not available try Steel or Tin.Copper is the worst. Try the circuit first on a bread board and if not working properly, make adjustments with the resistance values. This is often needed because conductivity of water changes slightly from place to place. The type number of the transistors used here are not critical and any small signal NPN transistor will do the job. Few other suitable type numbers are BC546, BC107, PN2222, BC337, BF494, ZTX300, BEL187 etc. The circuit can be enclosed in a plastic box with holes for revealing the LEDs . Water Level Indicator Circuit Diagram and Sensor Arrangement. Water Level Indicator If you need a fully automatic water level controller circuit then try this circuit Water level controller. The circuit is fully based primarily on transistors. The sensing section is somewhat similar to this circuit but there is additional circuitry for switching the pump ON when the water level falls below a set level and the pump will be switched OFF when the tank is full. Few transistors , one 555IC and an electromagnetic relay is used for realizing the control section. The circuit is very simple cost effective , reliable and many guys have successfully assembled it.I am also working on a float type water level indicator/controller using the float type fuel gauge mechanism used in motor cycles.The level sensor section is finished and now I am working on the control circuitry. I will add the circuit here as soon as it is finished We have more circuits and applications that you may like;Take a look below: 1. Fridge Door Open Alarm www.circuitstoday.com/simple-water-level-idicator 2/37 9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project 2. Automatic LED Emergency Light 3. Fan Regulator Circuit 4. Door Bell Circuit 5. Fire Alarm Circuit You may also like: Audio oscillator circuit Simple function generator circuit Digital thermometer circuit Water level Controller Capacitance meter using LM2917 We recommend: LED based transistor tester Bluetooth Technology Six pin Microcontrollers from Atmel-AVR ATtiny10 Program for Arithmatic operations in 89C51 IMAX – The Giant Step to Movies Search Custom Search Posted in Home Circuits, Test & Measurement Circuits Tags: 2N2222, circuit design, circuit diagram, Electronic Circuits, hobby circuits, hobby projects, Home Circuits, Most Popular Circuits Leave a Reply Name (required) Mail (will not be published) (required) Website www.circuitstoday.com/simple-water-level-idicator 3/37 circuitstoday..i would like to do this water level indicator project. 2012 at 7:13 pm I am doing this circuit for my project but as far I am seeing need to do some calculations therefore form what i am seeing here on this circuit the transistor configuration is a fixed bias configuration but i have a bit of a problem when i am calculating Vce i am getting a negative value why is that Vce is always positve …. 2012 at 12:38 am i like this project sir. pl send it to my mail as fast as possible Reply mounika says: September 11. 2012 at 4:37 am The distance from the tank to the circuit is about 60 meters. Chlorine. Reply Fahad says: August 22. 2012 at 5:24 pm sir . 2012 at 6:42 pm Hello Monica.com/water-level-controller-using-8051 Reply abdullahi says: September 3. will u plz send me the ckt diagram and its working details to my mail…am intersted to do this project.my question is why Vce is negative using the resistor values given in this circuit Reply vaisakh v m says: September 15. Try our new water level controller project – http://www.com/simple-water-level-idicator 4/37 . can i get the detailed project report for this water level indicator.and detail explaination.iam a final year student. Will the design work? Also can it be used for chemical tanks using a stainless steel probe? such as Acid. i need the cct diagm. i like to do this project for my 5th semester. 2012 at 2:28 am sir. plz help me sir Reply jojo says: September 11.circuitstoday.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Submit Comment 199 Responses to “Simple Water Level Indicator” Curious says: September 19. finally can i add the number of LED to about 10 for a large water tank about 120m3? www.my project is liquid level control and indicator using 16f877microcontroller. 2012 at 10:07 am Has anyone built this circuit and was successful with the operation would like to know thank you Reply Brazzo says: September 13.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project finally can i add the number of LED to about 10 for a large water tank about 120m3? Reply Shawn says: August 10. the circuit to fully re designed with ac and dc operation. and works fine. Reply Paul says: September 16. hence you cannot measure or operate. 2012 at 9:14 am Hello Mr. ac for the sensor and dc for operating a relay or a semiconductor alarm. 2012 at 7:38 am Hello Mr. Reply Seetharaman says: September 14. Seetharaman Thanks for the response.circuitstoday. The result was that there is a constant mild sound from the buzzer and no variation when probe E is inside or outside water. 2012 at 5:57 pm Me. with no changes. Can you please provide the circuit for the requirement? Thanks in advance… Reply Shawn says: August 6. since all the voltages are either rms ac or rectified dc. Seetharaman www. Reply Paul says: August 7. Reply Paul says: August 1.com/simple-water-level-idicator 5/37 . 2012 at 5:04 am Hi Paul just replacing transformer and a buzzer will not do. I just make the diagram. Seetharaman Well I started off with my circuit with 12V / 1A transformer.. 2012 at 8:51 am Dear Mr. Thanks. I connected a 12V buzzer. Kindly help. 2012 at 11:44 am Hi i would to know if there is any way i can use this circuit and incorporate it with a another like to sound an alarm using the 555 timer for low and high level basically the circuit i want to design is a water level indicator an alarm circuit any ideas . I tried the circuit with 12V AC to probe F and probe E to the base of a BC548 transistor. I checked the voltage at location of R5 (where buzzer is connected) and it constantly 10V irrespective of whether E is immersed in water or not. In place of R5. Reply anu says: July 5. Reply Seetharaman says: August 8. Please suggest the circuit amendments to suit the buzzer instead of LED. thanks.circuitstoday. 2012 at 12:04 am This is a great post. Thank You. Thank You. Can I use it in this circuit? Is it harmful to create electric shock in water? If in that case I shall go for 6V.. Reply Ravi Sharma says: July 26. where output of T5 should power a piezobuzzer. pl send it to my mail Reply www. can i get the detailed project report for this water level indicator. 2012 at 12:54 pm You are actually a good webmaster. The site loading pace is incredible. 2012 at 5:21 am i like this project sir.com/simple-water-level-idicator 6/37 . 2012 at 12:30 am Can u do it with logic gates only. Many thanks in advance. you’ve performed a wonderful activity in this matter! Reply Gaurav patil says: July 11. i think you can do the same thing with digital gates (no transistors) actually I need this circuit for my project. The contents are masterpiece. Moreover. not too complicated like this one. 1A transformer. can i also get a copy of this project?? could you please sent it on my mail with full description i like to make it as our project. i like to do this project. The reason for opting 1Amp o/p Xmer is that the tank is atleast 30meters from the circuit location. no transistors. It sort of feels that you are doing any distinctive trick.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project I have a 230 / 12-0-12 V. just one simple circuit. 2012 at 6:55 am hi sir. I hope you can post it ASAP. Reply Ravi Sharma says: July 26. RaviSharma Reply Goods at auction says: July 13. 2012 at 8:14 am Hi Paul use the recommnded transformer for positive results with different transformers you have change all resistance values suitably. Will 500mA satisfy the length? Nextly I’m planning to use only probes E and F. 2012 at 7:06 am Dear sir i want all procedure of how to done water level project with ckt & all solution Reply keanno says: July 8. Thanking you Vishwanath Udupa Reply Seetharaman says: June 5. Reply anyi joseph says: June 4. 1) we are taking direct wire of transformer out put to tank what if transformer burn is there any risk of Shock if transformer burn out. Finally check the LED polarity.C. short lead should go to GND and long lead should go to emitter. which works with linear indication of tank level (i. If the wire is too long it may pickup stray AC signals and give falls triggering. Your above circuit needs a bunch of wires to run about 15 meter length. Works very good. You can use a 0.com/simple-water-level-idicator 7/37 . check collector base and emitter connection of transistors. * I wanted an electronic device to be done. Is there any impact on heperformance of transformer if the legnth of wire is about 80 metres from transformer output to tank. but rugged construction. 2012 at 9:35 pm Hello Sir.circuitstoday. Each manufacurer has his own configuration in labling the pins. of course we get alarm at any level of the tank. 2012 at 9:40 am Hello Seetharaman. Anticipating your earliest reply to my E mail. Hi Joseph kindly check the connection to common probe F from 6 Volt AC. Reply Manissh Sharma says: May 8. 2012 at 11:24 pm Dear Seetharaman. 2012 at 3:37 am how it works Reply Manish Sharma says: May 8. is it not dangerous to take direct 6 volts of transformer to into tank is there not any risk of power shock if transformer burn out .with everything in place yet its not working properly.1uF ceramic disc capacitor between base and ground of each transistor.e. using piezo beeper alarm. if source water tank is empty) Please help me to get the solution. You can include a 250mA fuse in the primary to protect it.e. please what may be the possible cause of this. www. the LED are not showing any indication when the probes are properly place. I have make this level indicator using 547 transistor and 12volt transformer and it working fine i have two questions plz answer them . 2012 at 9:30 am Hi Manish Burning of transformer is very rare with good quality ones. Another circuit in parallel is needed to stop the pump when pump runs dry more than a minute (i. 2012 at 4:03 pm please i’ve tried to build the circuit. * I have done my own mechanical device to indicate “water tank high level” as well as “no flow of water to tank” with mobile charger supply 5 v D. please i need your answer urgently Reply viju says: May 15. 0 to 100%) and it operates the pump at low level and high level.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Vishwanath says: June 8. . 2012 at 12:08 am When tank is full nodify in sound mode. 2012 at 12:11 am LED only glow in DC mode. Then how it glow… And when tank is to be full how can i get notify by sound. i am also working on DC current but i got resist of problem of water. 2012 at 8:42 am hello I want to install a buzzer at full level how could i install it???? plz reply Reply sai kiran says: www. Pls reply Reply Ganesh says: April 19. This is a well thought out design. since water resisting so dc current unable to flow easily that’s why circuit is useless for filled tank. which will happen with DC. Reply asad ali says: April 24. 2012 at 9:37 am Hi Azad why 6 volt AC should be lethal and 6 volt DC is safe? I dont under stand. could you advice some thing save or based on dc current or sensor base. how can i install Reply abhi says: April 16. Reply Seetharaman says: April 19.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project 2)Does the Length of wire from water level indicator to the the tranformer have any affect on the performance of transformer plz reply to my question thanks Reply Seetharaman says: April 25. besides.com/simple-water-level-idicator 8/37 . But u say AC 6v Transformer without Rectifier. put a link in place of LED D5. i seen above circuit but the fault is that you are working on AC6V which could be dangerous. i need a water level detector circuit. Reply moorthy says: April 19. 6 Volt AC is good enough nothing will happen. hope you would send me better solution. i don’t think that we should allow ac current in water tank. 2012 at 9:28 am Hi Friends for full level alarm use probe ‘E’ In place of R5 connect an electronic bleeper which can work from 2 to 12 volts. The electrodes also will not get corroded due to electrolysis..circuitstoday. 2012 at 1:07 am hi. is there any buzzer to install. e.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project April 13. the positive terminal place in tank.from the supply.negative terminal let us connect to LED directly. To avoid this AC is used. Reply bob66 says: March 11.why cannt we use this simple method.. 2012 at 12:11 am Hi Sai you can try. with tank water conduction with the low voltage a minute current alone can flow through the LED and it will glow very dim even in total darkness you will find it difficult to see the glow. 2012 at 4:27 am sir.i got this topic for miniproject……if i get any pblm i wl contact u again. hence the current is amplified with a transistor and fed to LED such that you can view the glow during day light. i did not get the use of resistor in our circuit Reply Seetharaman says: April 13.why these resistors and transistors? Reply Paul says: April 5. Reply sai says: April 10. 2012 at 8:44 am Hi Bob with DC the probes will act as electrodes and start electrolysis action. please send me ckt diagram of water level indicator with full description Reply priyanka says: March 13. instead of four stages can I have only one stage. 2012 at 8:44 pm dear sir.circuitstoday.com/simple-water-level-idicator 9/37 . generally.since water is conductor the LED will glow. 2012 at 6:05 pm Dear Friends I have a doubt. 2012 at 3:20 am i know this is a simple & usefull ckt. Thanks in advance. 2012 at 6:37 am I want to know the use transistor and resistor in this circuit.from the tank connect to LED. Reply dhiraj says: March 27. i. by which the electrodes will start getting corroded soon and the function will get affected. Reply seetharaman says: March 12. hence no electrolysis and the probes will be cleaner for a longer duration. 2012 at 3:24 am www. the last one (stage E)? Also what changes I have to make to replace the LED with a 12V buzzer? Any help shall be greatly useful. 2011 at 5:42 pm www. 2012 at 10:47 pm Gentlemen. 2012 at 5:27 am i want circuit diagram of water level indicator in this LCD except than LED…… Reply ramesh kumar says: January 15. 2012 at 7:22 am this is a very simple structure of water level indicator. I don’t understand why there can be AC current at the probes because the LEDs don’t let the reverse current pass to have the negative AC wave !!! Thanks for your help! Reply vijayaraj says: March 4.circuitstoday. Reply adinarayanan says: February 5.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project HI! I have a problem! I replaced the transistors with a darlington array (uln2003) and it becomes VERY hot with 9VAC ! It’S stays cool with 9vDC …. Thanks and regards. your picture doesn’t show which direction to fix it. 2012 at 4:55 am can use a dc power supply Reply Seetharaman says: December 19. thanks Reply prashant says: February 2. operated with 3 VDC. i like it but i want to know more about water level indicator. when the simple 2-wire probe touches water level in wells the LED & Buzzer should be ON.com/simple-water-level-idicator 10/37 . Need an electronic diagram with value of electronic parts for measuring water level in wells /tube-wells. the resister position better you give me original photo in this page. but . please reply me. 2012 at 6:28 pm hai i got parts as per your list.Why? Also. 2012 at 6:14 am i have already installing automatic waterlevrl swtichs I want some advanced circuits to prvent motor burning Reply MUHAMMAD ASLAM says: February 10. Reply rameez meman says: January 10. circuitstoday. When the Tank is full. Thank you Reply mohit kumar sharma says: December 16. no red light (T0 is off) and when tank is empty only red light is ON.com/simple-water-level-idicator 11/37 . When the Tank is full. another transistor (T0) with red LED and it is OFF when T1 is ON and vice versa so that the whole circuit works as follows. Reply Ahmed says: www. i like it. 2011 at 11:05 am Dear sir. Reply Ahmed says: December 19. 2011 at 9:24 am Dear Seetharaman. so thank you very much. Thanks for your prompt reply.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Hi Ahmed connect new added transistor ‘T0′ base to collector of T1. 2011 at 11:37 pm this is a very simple structure of water level indicator. 2011 at 8:20 am thnx a ton… Reply Ahmed says: November 22. please reply me. I would like to add a stage before T1 . Reply mohit kumar sharma says: December 16. another transistor (T0) with red LED and it is OFF when T1 is ON and vice versa so that the whole circuit works as follows. Reply maggie says: November 30. 2011 at 3:20 am Dear sir I want simple water level indicator circuit with LED indication. i like it Reply barnaprince says: December 5. connect RED LED from collector T0 via 220ohms 1/4 watt resistance to 6VAC line and emitter of T0 to GND(common). I would appreciate the full details for the modifications required with values and how they are connected. 2011 at 11:38 pm this is a very simple structure of water level indicator. I would like to add a stage before T1 .. I would appreciate the full details for the modifications required with values and how they are connected. no red light (T0 is off) and when tank is empty only red light is ON. If possible I would also like to auto fill the 64oz container. 2011 at 5:14 pm Hi Sameer you can use 9 volt battery (only the sensing electrodes will get oxidised soon you require frequent cleaning).R7. I would appreciate giving full details of the modifications involved.plzzz sir tell me what to do. Thanks in advance for your quick reply. 2011 at 2:11 am www.R10 Reply Richard Anderson says: October 6. To connect an electronic buzzer for high level alarm connect a BC148 transistor base to T5 emitter and emitter to common ground. 2011 at 7:26 am sir i want to know how i joint R6.R8. Reply akash kokate says: October 14. 2011 at 12:39 pm Hi Neeraj Connect free end of R6 to R10 to A sensor to E sensors in the tank. Reply sameer says: September 25. 2011 at 8:11 am sir. I am generating hydrogen (the electrolyte is Sodium Hydroxide) using a 12 volt car battery.com/simple-water-level-idicator 12/37 . 2011 at 9:35 am sir if iam using buzzer to indicate the tank full. Any suggestions? Richard Richs-ledlights@hotmail. connect the collector through the electronic buzzer to 9 volt of the battery by observing the polarity on the buzeer.i have to control water level so what i do for it? plz reply………… Reply seetharaman says: October 10. Reply sameer says: September 25. I would also like to use these level indicating probes in a dual purpose possibly thermocouples into measuring the water temperature.R9. 2011 at 5:04 pm Hi staff. Connect +of the battery to 6Volt AC point and – of the battery to common ground.what will be the changes………. i really need ur help. Reply neeraj says: October 8. 2011 at 10:41 am Dear Sir.circuitstoday.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project November 22. I want to make T1 off when T2 is ON and vice versa so that when the tank is full no red light (T1 OFF) and when tank is empty only red light is on (T1 ON).com Reply seetharaman says: September 25. 2011 at 7:59 am bkwassss…………………. Reply KM Ealachola says: June 27. Thank U. Please ignore my previous mail. since they are not screened your routing is very important.circuitstoday. 2011 at 12:34 am REMINDER: Hi sir. Reply seetharaman says: June 24. 2011 at 7:15 pm Thank You for the information Mr. I have insulated Aluminium wire of 18 SWG. I am still waiting for Your answer for my question posted by me on 24th June 2011. My water tank is about 13 meter apart from the room where I indented to fit the indicator.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project sir can i use 9v battery insted of 6v ac. 2011 at 8:55 am Dear sir.circuitstoday.com/simple-water-level-idicator 13/37 . regarding the connecting wire between the sensor and the circuit. Reply seetharaman says: June 27.kuch mzzedaar bnao yaar…. Reply KM Ealachola says: June 28.plz reply fast wanna submit the project. 2011 at 10:46 pm www. one at the 6v indication and other at gnd. since I got answer for that question from previous posts. 2011 at 7:57 am Hi KM you can use 9 volt transformer without any modification.com/simple-water-level-idicator#ixzz1QSnUan6e Under Creative Commons License: Attribution Reply KM Ealachola says: June 24.an if i am using 6v where to connect the conection. KM Ealachola. 2011 at 9:59 am Hi KM you can use. Can I use a CAT8 ethernet cable to connect the sensors to the circuit? I hope You will reply me soon as I finished my other works and waiting for your reply to purchase suitable wire to connect the sensors to the circuit. which I can use to make the probe. If you are in doubt use a metal conduit to route and ensure the cable is dressed away from mains cable route. my question was as follows: “Can I use a CAT8 ethernet cable to connect the sensors to the circuit? “Can I use a CAT8 ethernet cable to connect the sensors to the circuit” Read more: http://www. Reply KM Ealachola says: June 23. SR Regards.Briefly. Reply ruchi says: July 20. if the cable is too long. What modification to be done on your circuit to drop the voltage to 6V ?. I have a lot of step down transformers in my home stay idle. I am very much interested in your Water level indicator and preparing to assemble one soon. Reply deepak jairath says: June 9. changing to DC source will affect the circuit? Will more components be needed? Please reply… Reply pritesh says: June 14.and will not be used for a long time. This is for a small project. and when water comes to the prob then it glows bright so please give me its solution. 1stly thanxz 4 dt u may upload that kind of ckt in site sir.com/simple-water-level-idicator 14/37 . Reply Seetharaman says: June 17. KM Ealachola. I have 9 Volt and 12 volt transformers. can I use a DC source instead of AC source. 2011 at 12:09 am can we use 9v supply aginst 6v…? www. Reply YNK FC says: June 17. Reply Seetharaman says: June 10.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Dear sir. 2011 at 9:35 am Please. 2011 at 2:44 am sir i have probblem that led are glowing dim continously. Hi Pritesh please go through my earlier comments on this problem if the connecting wires are too long. the circuit will work. But none of them have an out put of 6V. etc. Reply YNK FC says: June 16. 2011 at 3:57 am Hi YNJ FC you can use DC. 2011 at 8:39 am sir. my requirement is dt i will make a project which may also mention d automatic control water level ckt at OHSR so dt it may give supply 2 public as per requirement Reply shashank says: May 21. So.circuitstoday. 2011 at 4:49 am Thanks for the quick reply Mr SEETHARAMAN. 2011 at 4:19 am Hi Shashank you can use 9 volt. no change is required. How can I use a 9V transformer in place of 6v ?. I am looking forward for your reply. Thanking You. and too sir i have to mount the circuit in my building basement and water tank is 50m high so as very long wires will be used (5 wires each of 50m) so there will be any problem in doing so or not…. 2011 at 4:04 am The cable can pick up stray mains hum and the LEDs can glow dimly. 2011 at 10:11 am sir thanks for ur reply…! i want to ask u something related to voltage if u can suggest plz help.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Plz reply… Reply Seetharaman says: May 14. base & emitter of transistor – the lead arrangement differs from manufacturer to manufacturer.. Reply Aki says: May 2. 2011 at 12:58 am Hi Aki you can use input 115 volt instead of 230 volts or you can use a 12 volt to 6 volt step down transformer.circuitstoday. Reply AkI says: April 29. but i have a 12v transformer so sir can u tell how can i use this 12v AC transformer to reduce it to 6V AC transformer. 2011 at 7:54 am Hi Akhil have connected one of the transformer 6volt AC to F line and other one to common shown as ground. Reply aki says: www. add 0.01 ceramic disc capacitors in parallel with the base and ground of each sensing circuit. 2011 at 10:17 am sir. sir as in circuit its 6v AC is used but i have DC source of 6v for the same. If every thing is ok it should work. Reply Akhil mathew says: May 13. 2011 at 1:02 am hi i just want to know if its okay to use 4 sensors other than five as given in the diagram.com/simple-water-level-idicator 15/37 . 2011 at 8:41 am Hi AKI this is due stray pick up check the cable routing/ or cable may be too long picks up stray field.i connectred the sensor to a 6V AC transformer but still nothing works!!! awaiting for u r reply Reply Seetharaman says: May 3. Check collector. Reply Seetharaman says: April 30. Also check the LED polarity. Also ensure F probe is connected to transformer.plz help… Reply Seetharaman says: April 19.my problem of dim lightening is over when i did with wires connection and when i mounted on pcb it started glowing means very dim without any probe in water so sir y this happening in pcb connection but not in wires connection. . Reply zubair says: February 16. I used ordinary electrial wires as probes. so y this happen on remove of water a very dim light glow. 2011 at 5:05 am HI i just want to know what the F sensor in the diagram is and how can i attach it to a water pumping motor for automatic on or off using a relay…… Reply VG KRISHNA says: March 13. 2011 at 10:59 pm Thanks a lot for the good work. I assembled the above circuit (with only one section out of 5 sections shown in the diagram i. I converted the voltage to D. 2011 at 8:22 am Sir. www. Reply Seetharaman says: February 15. Thanks Reply Seetharaman says: April 6. 2011 at 11:18 pm Hi Akhil F sensor is connected to 6 volt AC point. I have made this device with the same specified components and working perfectly well in Haryana (India). I have used 12V instead of 6V as LEDs brightness was not good with 6V supply.2010). so that as soon as the water touches both the probes . below the minimum level probe. I reduced the value of R1 to 330 ohms as suggested by Sri Seetharaman (Oct. Thanks a lot.please reply me soon to complete this circuit.I also attached a buzzer in parallel to Dl.com/simple-water-level-idicator 16/37 . Instead a common switch also can be arranged if it facilitates.D1. when the water level goes below sensor B let the pump start filling the tank. in this above circuit NPN transistor is used then please tell me which point is Base. I also switch on this water level indicator . will come and we switch off both the switches. 2011 at 11:23 am i made this circuit but when i dip in water it lights up but when there is no water id lso lights up but very dim. emitter and collector. once tank level reaches E level let the pump stop.5. Whenever I switch on the Motor to fill up the overhead tank. I am thankful to CIRCUITS TODAY for giving the above circit.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project April 18. the LED light along with buzzer sound. Reply Akhil mathew says: April 6.R1. by a rectifier. Reply Manmohan Garg says: March 5.but in the last I joined about 1/2 meter of Electric alluminium Service cable wire (available in Electrical shops).C. after redcing the number of alluminium wire strands from each wire (Red wire and blck wire) to make it thin and both the probes I put inside top protion of Over head tank (please see that there is no shorting between the two probes). 2011 at 8:43 am Hi Zubair it will be the bottom most. plz suggest waiting for ur reply. I have one more question that is.e. It is working very very fine for the last so many months. 2011 at 5:48 am Hi.T1 and R6).circuitstoday. 2011 at 8:21 am Thanks for reply sir please tell me where does the F probe connect in the circuit? Reply Seetharaman says: February 13. 2011 at 6:58 am www. The electronics can be around 20feet away. Then maybe we can help you to decide which one are you going to choose. routing of cable is very important. please also send me a photograph too. but 3 or more questions asked after me are replied? Subramanian Reply joseph says: February 8.reply me soon. Reply zubair says: February 12. Reply nauman says: February 2. 2011 at 11:55 am Dear Sir. size the length of the conduit kept such that it is tight fit in the tank by using bottom and top covering of the tank so that the whole assembly does not move or fall off.circuitstoday. Kindly send me a reply with more details about water electrode probe. 2011 at 8:32 am Hi Rougy correct F should be connected directly to 6 volt AC point. tip exposed by about 10mm will do.C negative point? and where does the F probe connect in the circuit?reply me soon Thanks. 2011 at 4:54 pm nauman. 2011 at 1:44 am Hi Zubair kindly connect one lead of the transformer secondary to 6V AC and the other wire to point indicated as GND. Why my last question is not answered. thanks Reply N Subramanian says: February 9. For probes you can use 1/18 PVC insulated aluminum solid conductor. 2011 at 2:47 am Hello.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Reply zubair says: February 15. please include your preferred topic. Reply zubair says: February 12. joseph Reply Seetharaman says: February 3. 2011 at 11:41 pm sir please tell me that where i connect the 6 volt main A. All these 6 probes (wires) are fixed around 15mm plastic conduit with thin plastic rope.com/simple-water-level-idicator 17/37 . beside main on/off switch of the motor at about 30 feet away from the tank? What are all the modifications needed to the circuit? Thanks & regards. but i don’t get the response u gave with regards to where to connect the F in the circuit. Can I use 4 pair telephone cable for probes and wiring? Can I put the probes alone at the tank and have the rest of the circuit at kitchen. I need few clarifications for “Simple Water Level Indicator”. 2011 at 10:56 pm What if we use aluminium wire immersed in water and then connected to transistor using copper wire in between? Reply Subbudu says: January 16.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project plz help me abt the topics of projetcs.circuitstoday.plzzzz Reply Rougy Y.Subramanian Chennai 9840130608 Reply admin says: February 9. beside main on/off switch of the motor at about 30 feet away from the tank? Ans: YES www.com/simple-water-level-idicator 18/37 . 2011 at 6:33 am hi hello respected sir I got this ready project replay soon Reply Amol says: January 19.Seetharaman. 2011 at 10:53 am Thanks. for the response to my earlier question. Is it directly or what? Also i will like to know to try out my prototype on a breadboard. Seeth. 2011 at 3:53 am Can I use 4 pair telephone cable for probes and wiring? Ans: YES Can I put the probes alone at the tank and have the rest of the circuit at kitchen. Will the circuit be sitting somewhere while the probes lie in the tank? Reply Parth says: January 27.. I am an electronics hobbyist (novice) and I lack theory. Daanaah says: January 31. you said it should be connected to the 6V AC. 2011 at 9:32 pm Dear Mr. Pls i have finished connecting all the various components as indicated in the diagram. N. Thank you very much for your kind information. Reply Seetharaman says: December 19. current is say 5mA (0. 2011 at 9:38 am Sir.7 volt for 2N2222. if this circuit (the values of resistances) follow it or not or how to calculate the valus if it doesn’t: 1. while doing this project I tested the LED by keeping the base terminal in water and keeping the F terminal in another vessel carrying water. Say you use a Red LED.7 volt for a fair glow.7 volts) Reply Amna says: December 10. I made this project in our college science fair. and does have LED to work with AC corrent. Now the LED is glowing.7+1. 2010 at 1:09 am Hi AJ Check with different probe input (swap the inputs of working one)may be input resistance in not low enough for the probe.7)=3.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Reply Vijay says: January 10.
[email protected] volts. 2010 at 5:17 am Hi Amna The collector resistances limit the current through the LEDs.v. say nearby preferred value of 680 ohms. 2010 at 3:40 pm hello my friend. i wanted to ask u about them. 2010 at 12:09 pm This project is perfect for me as i am just a learner at the moment.com Reply Seetharaman says: November 14.005Amps) then the collector resistance required is 3. please email me. 2010 at 12:07 am Hi Lakshmi the leakage path between the vessels might have been sufficient to light up the LED. please explain me how it is working even by keeping the F terminal in another vessel carrying water. (Vbe is 0.2 Potential difference between the collector base and emitter base of the pnp bjt used 2. why transistor using in circuits. www. Reply v. 2010 at 9:23 pm Dear sir. The supply is 6 volt the VCE sat is say 0.com/simple-water-level-idicator 19/37 . there should be a 0.2 volt is for germanium transistors for silicon transistors it is 0. Since there are some specifications i have to follow. current should nnt be more than 2 Amps I would be grateful if u can help me out in this Reply Gezim says: November 22. Reply Seetharaman says: November 9.6 / 5 kilo ohms.lakshmi says: November 12.circuitstoday. total voltage drop required is 6-(0. i have see your scheme and the transistor 2n2222 does he work with AC corrent or not. it requires 5mA @ 1.can i replace with 2 diodes. resistor. i will send my prototype photos soon.com/simple-water-level-idicator 20/37 . 2010 at 6:25 am Please as part of my final year project. it is happening in opposite way. 2010 at 3:58 am Dear sir Only my second LED is not glowing even though the transistor. Please also refer to the notes given below the article. If i want to connect a buzzer. Collector is connected to the can. Thank you. Reply rougy daanaah says: November 2. Reply Thomas Mierzwa says: October 14. Something is wrong with your circuit. 2010 at 6:51 am transistor pinouts are correct as installed. 2010 at 9:40 pm Hi sir Should i use only aluminium wire or can i use copper wire sir.circuitstoday. pls suggest the buzzer too Reply Seetharaman says: October 24.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Reply aj says: November 8. i to build a simple water level indicator. colector base shorting will give forward bias to the transistor hence it should light up brightly. Pls reply fast sir… Reply Seetharaman says: November 3. how can i connect it to the circuit to function well. www. Hi Malli You can use any insulated 18 Gauge solid wire any conductive metal. Reply Malli says: October 23. Emitter is indicated as a tab on the can. yellow for medium level and green for high etc. But am not too sure of the components required to build the circuit. 2010 at 3:12 am Hi Thomas Collector to Emitter is OK bur base emitter shorting should remove bias for the transister and it should estiguish. Help some help. 2010 at 4:27 am Hi Roughy The list shown is ok but only R1 to R5 to be reduced to 470 ohms for brighter LED indication. to have better illumination from all these LEDs R1 to R5 to be reduce as above.LED related to that are in working condition. 2010 at 10:33 pm Hi. 2N2222 has a metal can. Reply Vanan says: October 27. although the current flowing through all the transistor is same. you may use RED for low. 2010 at 9:41 am Hi Thomas there is nothing wrong in the circuit working fine for the last more than 6 months with 2N1711 transistors ( which is similar to 2N2222 and that was just on hand). (expose around 10 mm for sensing). Reply Seetharaman says: October 14. When I immerse a level probe into the water.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project kindly check the transistor lead out and rewire if necessary’ Reply Thomas Mierzwa says: October 13. 2010 at 9:23 am Hi Thomas your pcb may be leaky you may have to clean your pcb after soldering the components. kinly check up by shorting each transistor base and emitter.please how it increase . the above suggestion was given. 2010 at 6:07 pm Hi My LED Bulbs are very dim (Simple water Level Indicator) . the flux can produce a leakage path. 2010 at 9:40 am Hi Thomas it should work as it is with high efficient 5mA LEDs. Reply Harry says: October 10. Please as soon as possible. if you are getting after connecting the probes then the probe wires are too long or not properly routed. show me with simple diagram. 2010 at 7:23 am www. not brightly but they are lit. 2010 at 3:47 am Is this experimenter’s corner? Because I have $62 U.1uF in parallel from each transistor base to common. I was under the impression that the LED should be out completely until THAT probe’s sensor was under water. collector to base led goes out. in such adverse conditions you can use a 100k resistance with 0. These are all basic simple circuits may require refinement at times as per the operating conditions. For your information the resistivity of water is 820 ohms @ 25C. As soon as I plug in the transformer. Harry Reply Seetharaman says: October 10.circuitstoday. What is the function of the capacitor that is in parallel with the collector resistor? Reply Seetharaman says: October 11.S. Reply Harry says: October 10.com/simple-water-level-idicator 21/37 . 2010 at 5:43 pm emitter to base shorted as requested results are the led lights up brightly. emitter to collector led lights up brightly. Reply Thomas Mierzwa says: October 13. ALL LEDs light up. The When you plug AC and if all LEDs are glowing it is through the leakage path in the base circuit. 2010 at 1:52 am Hi harry Reduce R1 to R5 to 330 to 470 ohms to suit your LEDs. Reply Seetharaman says: October 13. the LED it is connected to increases in brightness ever so slightly. to eliminate this problem and to suit your type of LED. if the corresponding LED goes off then it is clear indication of either leakage path or stray induction is resulting in this glow. tied up in this so far. The total length of the probes and wire is fifty feet. Reply Thomas Mierzwa says: October 10. use a bigger pvc pipe. please help me soon . Reply Jack says: October 5. ensure the location where you measure the level there is no frothing or surge in level. are they insulated between them properly. 2010 at 2:32 am This circuit is going to be used to indicate forebay water elevation in a hydro-electric station. Won’t the copper resistance of the wire have anything to do with the sensitivity? The power supply is a plug in 120 volt to 6 volt ac step down transformer with an output of 600Ma. My plan is to use a red LED at the lowest level. I’ll check this out. Harry Reply Thomas Mierzwa says: October 10.Eletrônica – Dicas. but they do brighten slightly when continuity is established between the common and a level probe. ensure the routing of the cable is through a metal conduit to avoid stay inductions. 2010 at 1:55 am Hi friend visited site and replied. 2010 at 3:06 am Hi Thomas the lead resistance will not matter. If you can spare the time answer me in regular email please.com/simple-water-level-idicator 22/37 . 2010 at 5:51 am I soldered everything up and tested it on the bench. What is the type of your probes. if it cannot be avoided. Esquemas.circuitstoday. Links e muita Informação says: October 4. I made up a printed circuit board with ten transistors and associated resistors on it. with both ends open. all others are level sensors. Lights are very dim . by which the level alone will be communicated to the probes.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Hi! I prepared the circuit diagram of simple water Level indicater . If above checks are carried out it should work ok. Reply Seetharaman says: October 5. Ensure that your PCB is thoroughly cleaned. green LEDs for the intermediate levels and a yellow LED at the highest level. Reply Seetharaman says: October 5. 2010 at 1:33 pm www. The probe assembly is a piece of 1/2 inch pvc pipe with a common probe at the bottom and individual wires [probes] for each level at one tenth of an inch increments up to a foot. with NO level probe connected they’re dimly lit. Cursos. I am enclosing my comment. Reply Seetharaman says: October 10. to enclose all your probes. why do all the LEDs light up as soon as power is applied? They’re not at full brilliance. Reply Indicador do Nível de Água . but its not working properly. how can i correct the lights. 2010 at 2:12 am Hi Jack F is common. 2010 at 4:00 am Thanks Seetharaman. Hi R1 to R5 has to less than 1K (470 ohms is practical)if the LEDs to glow to visible level with ambient light level. try to use high efficiency LEDs. ] Mais informações …. 2010 at 7:52 am Hi Atul please refer to earlier comment on Aug 29th.. 2010 at 5:31 pm Hello sir. Reply Seetharaman says: October 3.. is it possible to attach a relay on this type of circuit? I intend to add a relay to automatically shut off the water pump when the water tank is full. i also want to asked the same question…is it possible to attach a relay on this type of circuit?. if you want to have the modified drawing pl send email to
[email protected] Reply jerome says: October 2. 2010 at 9:10 am an diode of which type and capacitor should be electrolytic one or other?????is it colpulsary to use this diode and capacitor???? www.com) with an attachment having circuit diagram of amplifier please read the mail and reply me soon Reply seetharaman says: September 6... I have built the circuit. but all leds D1-D4 glows even if one probes of A-D are put in water. 2010 at 10:01 pm Works perfectly. 2010 at 2:00 am Hi Jerome you can attach a relay by addind one more transistor you refer to my earlier comments.] Reply Jack says: October 4. Assuntos relacionados: Timer com apenas um CI 20000 Esquemas eletrônicos e circuitos eletrônicos grátis Diretório de Circuitos e esquemas eletrônicos Detector eletromagnético Chave controlada por toque [.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project [.. 2010 at 4:18 am Dear Sir.thanks… Reply Jay says: September 29. 2010 at 9:28 am hello seetharaman i have send you mail(
[email protected] will also use this on my automated hydroponics system.. You reply will be greatly appreciated. you have to use 1N4002 with 100uF to covert puslating DC available at the emitter to become pure DC before feeding into electronic sounder Reply Ilkin says: September 5. modified bit to handle 8 leds (different color) Reply ATUL BHIDE says: September 5..com/simple-water-level-idicator 23/37 . 2010 at 8:43 am Hello sir. Thank you… Reply emmi says: September 6.circuitstoday. 2010 at 9:08 am so should i replace 2. Reply Atif says: August 28. expose just 10mm wire at the water end.2k collector resistance to 100 ohms it should solve your problem. Ofcourse rectifier diode and capacitor is a must. 2010 at 6:51 am Hi Atul it will affect the transistor. 2010 at 4:45 am Hello sir! I made project its working but my BUZZER sound output is weak its a continious 3-24V buzeer as our supply is 6v due to the resistor its affects more make the buzzer sound weak so can i put resistors of other value less than the given values and i want to ask that can i connect the probe direct to the base of transistor this makes the sound of buzzer strong but will it affect the transistor????plaese reply soon so as i will make the changes!!!!! Reply seetharaman says: August 28. Reply ATUL BHIDE says: September 4. The above change will give your load around 25 to 30mA. since it is ripple DC the volume is low connect from emitter through a diode to the electronic buzzer also connect a capacitor of say around 100uF in parellel with the buzzer this should solve your problem.2k to 100 ohms but which i did the changes of supply would i be remain same????? Reply seetharaman says: September 5.????????? Reply ATUL BHIDE says: August 29. two of this will be required. 2010 at 8:57 pm Hello sir i made some different changes sir i changed the trasistor to CL100 it worked and i also changed the resistance value at base but when the probes were in water again the sound became low so then i changed the supply to 12 v to check then i faced a new problem that without giving the supply to base the transistor was on continiously………was it because of the supply…………. this will be your probe.so what i can i do further to increase the sound should i again change the trasistor to suit the supply if so then which trasistor can u tell me sir plzzzz……. which is sufficient for the LED and electronic sounder. 2010 at 3:04 am www.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Reply ATUL BHIDE says: September 5. 2010 at 7:13 am THANK you sir i will try this!!!!!! Reply seetharaman says: August 29.. 2010 at 8:16 am Hi Atul reduce 2. No other change is requires.com/simple-water-level-idicator 24/37 . connect one to 6 volt AC and the other one to transistor base through 22k resistance. 2010 at 7:58 am Hi Atul you can use 1-18 aluminum insulated wire (single strand 18SWG PVC insulated).circuitstoday. Reply ATUL BHIDE says: August 29. 2010 at 7:21 am thank you sir for urs quik reply can i use this system in my water tank??? and those 2 probes can i use alumunium ones????an one probe connected to 6v and other 1 to the transistors base???? Reply seetharaman says: August 23.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Ya Atul u can it with ur water tank i use it n its working fine Reply ATUL BHIDE says: August 23. 2010 at 10:14 am Hi Ashu you ca use asimilar circuit with F and A probe only in the water flow pipe line .circuitstoday. I have made one with 10 indicators and I also made up my Water Pump auto www. 2010 at 10:09 am Hi Thomas it should be connected to 6V AC Reply Thomas Mierzwa says: July 25. 2010 at 3:10 am I want to ask that when one probe gets elecrically connected the previous probe will be still connected on will get disconnect???? plzzz reply sonn i am eagerly wiatin to do this project Reply ATUL BHIDE says: August 22. 2010 at 9:19 pm Hello sir. Reply seetharaman says: July 25.com/simple-water-level-idicator 25/37 . Reply ATUL BHIDE says: August 23. 2010 at 4:22 am where does the F probe connect in the circuit? Reply aSHu says: July 25. 2010 at 1:45 am Hi. when water flows it will conduct when water flow stops it will go open and an alarm can indicate the dry run. This is a interesting circuit related with water tank. I WANT to ask that in this project there are to many LEDs connected this denotes that at each level at led glows but i want to ask that can we do one LED connection at last level and can we connect a buzzer to this ONE led connection means at final level of water along with this LED a buzzer will also start I WANT this connection at my home so plz tell me on small scale basis sie plzzz do reply can it be possible?????? Reply seetharaman says: July 25. 2010 at 4:14 am hi Atul you can use just 2 wires and one transistor with collector to LED and to an electronic sounder this will meet your requirement. Reply seetharaman says: July 23. But some how I saw corrosion happening to the wire dipped in the water after few weeks. in my area there sometime lack of water in the main water pipe line. you can try stainless steel rods in place of aluminum.com/simple-water-level-idicator 26/37 . SS tubes of 4mm and 6mm id are available from instrument dealers. The actual implementation was that I have dipped the output from the step-down transformer (6-0-6) which is an AC current into the water through the aluminium wires. So.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project system so it turns “On” when water level of the tank goes down and turns “Off” when water level reaches to its top level. I have attached ma Pump/Motor in the main pipe line for suction of water but sometimes Air catches in the Pump/Motor due to lack of water in the main pipe line. to avoid high reactions with water better to use low voltage which can be detected by electronic circuit hence i prefer around 3volt. This will be later replaced by the LED connectivity with connecting it to a 555 timer IC. Please Help me. Reply seetharaman says: June 26. 2010 at 9:49 am Hi Manjit you can use DC it will work but the electrodes(sensor) will get oxidised soon due to electrolysis of water with DC. It will be great if you can provide me your contact number so that I can contact you for any more details to my mail id sram_mohan at yahoo dot com. Should we use voltage in the range of 3-6V or if a voltage of 9V is also OK. I require a circuit which can be placed at the water flow end so that it can give a signal if there is water flowing or not. Thanks a lot for such a quick reply. 2010 at 3:02 am Hi Ram Mohan we use 1/18 insulated wire with 10mm exposed at the sensing point. Now the problem is. Supply instead of Ac supply???? Reply seetharaman says: June 26. even after one year of operation with low voltage AC (3 to 6volt AC ) the functioning was ok but very little colour change on both the wires. 2010 at 8:50 am Hi Ram Mohan 1/18 is single strand (solid conductor) of dia 18SWG wire. This is rectified using a bridge rectifier and given to the LED. 2010 at 9:32 pm Can we use a D. What is the 1/18 insulated wire. this should www. 2010 at 7:54 am Hi Seetharaman. Are they anything special wires or am I too dumb to understand . can you kindly let me know from where I can get the stainless steel rods as these are not so commonly available in the market. may be the water at your place may with more corrosive salts. and the Pump/Motor keeps running without water and heat up and burns. The other wire receives the current from the probe dipped in the water. Kindly let me know if I need to add any capacitors or any other circuit.C.circuitstoday. i will mail you soon Reply Ram Mohan S says: June 26. normally used for 5Amp lighting house wiring. -aSHu. Reply Manjit says: July 22. As for the next step. 2010 at 6:25 am Hi Mitu Moharana it is an audio stereo amplifier http://www. I kept it in the water (Basically a Jug of water) for few weeks but still found that one of the aluminium probe inserted in the water was getting dissolved. if this is also getting corroded.the 6v current will make any harm to us. Some how my previous query posted here went unseen by the author.com/simple-water-level-idicator 27/37 . Reply bucks says: May 28.circuitstoday.pdf. 2010 at 8:33 am dear sir. 2010 at 1:23 pm This circuit is very helpful especially in our home or in our piggery.But you do not mentioned their leg number. do you have any other alternative ideas like some float device using which I can make use of a probe. You can use float swiches but they are very expensive. it needed a DC signal. though expensive will be highly reliable. So when the probe in the above circuit is an AC current I needed to convert it to DC.plz do the same. i need this circuit for my home purpose means water supplies to bathrooms and kitchen. as a last resort you have to think of magnetic float and sealed magnetic reed switches.org/datasheet/rohm/ba5406. Reply Ram Mohan S says: June 25. Reply seetharaman says: May 29. 2010 at 8:30 am Hi you can use any insulated solid conductor of 1mm dia end around 10mm exposed. I wanted to make an automatic controller using 555 timer.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project solve your prolem. Reply MITU MOHARANA says: June 2. Kindly suggest. 2010 at 2:50 am can i use any wire for the probe? can i use a floating switch on an industrial project? Reply shahensha says: May 25. www. I can see some good number of posts from you in this website.datasheetcatalog. I am desperately trying to make a probe for my water level controller but failing when working on it. Reply seetharaman says: June 3. 2010 at 7:33 pm Hi Seetharaman. Could you kindly help me in this matter? P.S: The water is a bore water so it will have some salt content.i saw a circuit diagram details of the IC BA5406. Reply sonny says: May 29. 2010 at 8:03 pm Sir. So to the return line I put a bridge circuit using 1N4001 and converted it to DC and gave it to a LED with resistance in series as load. If this problem cannot be solved. 2N3904. 2010 at 9:08 pm Hi Edgardo You can connect a diode 1N400X (any one in the series) to LED anode (which ever the level you want to monitor) connect a filter capacitor say 47mfd (as the supply to this circuit is AC you will get 50Hz ripple at the LED) and connect through 1kilo ohms resistance to a switching transistor say 2N2218 and its collector through the 24volt relay to positive of a seperate 24volt DC supply. I. also in the posts. and more power to you. 2010 at 6:55 pm i nned a ful description about an emergency light of lm317 why we use lm317 ic why we donot use a potentiometer at place of this ic www. 2010 at 7:58 pm Hi Seetharaman sir. Seetharaman Sir. 2010 at 6:57 pm sr i want also make sap (simple as possible computer) what can i do to complete this Reply syed qamar says: April 17. Reply sumairaarshad says: April 17. Many thanks and more power to your site. BCY59. 2N1711. base of 2N2218 to limit Ibe. Reply seetharaman says: April 23.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Reply Edgardo Diolola says: May 12. Reply seetharaman says: May 8.com/simple-water-level-idicator 28/37 . this is a very good circuit as I see it. Reply Edgardo Diolola says: May 8.d love to buiuld one for this project. Emitter of the transistor also to be connected to LED cathode. Any transistor with a minimum specification of Vceo 40volt Ic 300mA Ptot 500mW. Where will i connect the 1 kohm resistor. hfe 100 @ 100mA and Ft 100MHz. Reply EDGARDO DIOLOLA says: April 23. 2010 at 10:12 pm Hi Edgardo yes. at the base of the transistor? What would be the other equivalent part number for transistor 2N2218? Thanks in advance. even though R1 to R5 is available.circuitstoday. My best regards. Thanks a lot for the very kind reply. can take care. Pl donot forget the freewheeling diode across the relay. 2010 at 7:25 pm Sir. whose negative should be connected to LED cathode . Can we incorporate a relay output of 24 volts coil rating in behalf of the LED output? Any suggestive circuit. 2010 at 8:21 am Hi. Any medium power NPN switching transistor can be used. i also followed the same thing but with some modifications. I was having problem with the sensor and after reading your post. Pump is 1/2 HP in capacity. Can some one suggest how to connect the relay and the specification of the relay needed.I’ve one suggestion. Reply Ram Mohan S says: March 1. However i made a basic water level indicator that signals when water level is full. 2010 at 10:44 pm if o/p was connected to the relay through timer. 2010 at 12:11 am circuit diagram for water level indicator using IC555 Reply Ram Mohan S says: March 9.500 ma) from the transformer in the water. 2010 at 6:10 am using this design how can the motor be switched off automatically when the required water level has been indicated? Reply Pankaj says: March 1. We use the bore water and basically the water is a lil hard in my place.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project please help me to construt this in typical method Reply sridhara says: April 7. you need to connect the output to a relay. I want to add relay switch to turn off the pump when water tank is full using the signal available. So i dipped one end of the AC output (9V AC. What you say is true but that would be tentative of the tank getting full.circuitstoday. 2010 at 1:28 am Hey its really nice and cheap too. Reply anubhuti says: March 1. If you are well versed with the functionality of a relay then it can be easy to do so. www. 2010 at 12:38 am Hi. The DC output was connected to the LED. This will turn on the tank for the specified amount of time irrespective of the tank getting overflowed or not getting filled to the desired level. 2010 at 9:32 pm To turn ON or OFF.) Reply Ram Mohan S says: March 3..com/simple-water-level-idicator 29/37 . 2010 at 9:42 pm Srikanth.. Initially it went on well. 6V is available at the signal Reply vivekanand says: March 17. Reply srikanth says: March 5. we can also control water level in the tank (by using simple 555 timer circuit which is in this site. and the other lead from the water to the full wave rectifier (4 diodes). 2010 at 2:14 am I am a layman on electronics. i connected the other lead of the transformer to the other lead of the full wave rectifier.Can we fix small buzzer for tank full indication. Reply s. 2010 at 1:16 pm I am not having much knowledge about electronics. P. Am I to insist on 1/4 watt while procuring? or just procure standard resistors. Could you kindly let me know if I am doing any thing wrong.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project The LED started glowing well and the probes dipped in the water was also clean. In small electronic shops they mention only the resistance value. If the circuit asks for a 0. As long as it is higher rated than what was asked for then you are safe.The 0. Am I to insist on 1/4 watt while procuring? or just procure standard resistors. Your circuit seems to be really simple with minimum components.SARAVANAN Reply senvin says: December 31. But why am I seeing this scale on one of the probe. -Rams Reply ajith vijayan says: February 21. Thanks Reply www. Thanks Senvin The power rating of a resistor is calculated.com/simple-water-level-idicator 30/37 .circuitstoday.S: I am using an aluminium wire dipped in the water. In small electronic shops they mention only the resistance value. I want to enhance this circuit so that I can control it completely to turn ON and OFF the motor. But after a month. 2010 at 10:37 am sir. If the author has stated a 0. As such I am passing an AC voltage through the water but rectifying it to DC when I get it to a load. 2010 at 5:20 pm dear sir. I have started seeing scales around one of the probe that is dipped in the water.25 Watt resistor but a 0.saravanan says: January 18.You have mentioned as 1/4 watt.25 will do.You have mentioned as 1/4 watt. I am having small doubt about Resistance. thank you Reply twits4twats says: February 7. Regards.i was mail from tirupur i give small robotics circuits and details of photographic by best regarts. then any rating above 0. I am having small doubt about Resistance.25 Watt resistor. in the circuit diagram ‘f’ is not marked. S. In fact. my name is s. Even though the LED is glowing I doubt how many more days will this connectivity go on.5 Watt. Your circuit seems to be really simple with minimum components.saravanan. the bigger the better within reason.5 Watt resistor is half the price.25 is typically allready overstated to prevent burn out. 2009 at 1:13 pm I am not having much knowledge about electronics. go for the 0.. Reply Nishit says: October 22. Reply Francy Kakkassery says: www. Reply niranjan says: November 11. niranjan Reply admin says: November 13. Sincerely yours. Kindly send me a reply with more details about water electrode probe. Immerse it into the water as per the description in the circuit. 2009 at 9:16 pm AC voltage means that it will have positive and negative half cycles. i would like to ask you that if i will use single strain wire as probe immersing in water. The transistor acts as switch and will drive the LED connected to its collector. thats nice. 2009 at 9:08 am sir. and it works. 2009 at 7:33 pm Dear Sir.com/simple-water-level-idicator 31/37 . 2009 at 12:56 am The probe i mentioned here is just insulated aluminum wires.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Serch says: December 2.will it create any problem? this wire we normally use for breadboard connection. 2009 at 6:56 am hi!: hi i probe ur circuit into an emulator. but my question is that if we have to use 2 transformers or use the same t the bottom. 2009 at 9:29 am why do we need the transistor why cant we simply use resistors only i am talking about a very small scale demonstration project Reply admin says: November 13. Due to persistence of vision we feel that LED is glowing steadily. Reply sahil says: September 1. 2009 at 1:01 am the current conducting through the water is not at all sufficient the light the LEDs. Since the mains frequency is 50 Hz the diode will be blinking 50 times per second.circuitstoday. The diode will light only in the positive half cycles. please also send me a photograph too. and can u tell me why the led�s turn on with AC if they are output comp of DC?? thanks Reply admin says: December 10. Just remove the insulation on the tip of the wires for 1cm. Probe is ready. sir plz do reply. Sincerely yours. 2009 at 12:40 am Happy to hear that you successfully constructed the circuit. India Reply admin says: July 9. Just remove the insulation on the tip of the wires for 1cm. Dawlyia Establishment.circuitstoday.I will give you a detailed description. To : Export Manager Dear: First off all we do hope if you & your team ok We are a private Saudi Arabia company for all kind of water & oil level controller & we would like to be your agent for your water level controller in Saudi Arabia shortly. Thanks once again. Kindly send me a reply with more details about water electrode probe. we are looking forward to hearing from you ASAP.Kerala.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project July 9. 2009 at 9:21 am The probe i mentioned here is just insulated aluminum wires. 2009 at 5:57 am From : Donia AL. Tel no: 00966-530279520 www. Thanks … Marketing Department Donia AL.India Reply admin says: July 14.com/simple-water-level-idicator 32/37 . Immerse it into the water as per the description in the circuit. Thank you very much for your message regarding the water electrode probe. Probe is ready. 2009 at 4:57 pm Dear Sir. Still not satisfied ???? Comment here . Finally. please also send me a photograph too. regards Reply Francy Kakkassery says: June 20. Reply alaa joujou says: April 25. I am satisfied with your explanation. and it is working properly. Kakkassery.Keep on. Kerala. Kakkassery. Dawlyia Est. 2009 at 8:15 am Dear Sir. 2012 at 6:24 pm Dear sir. Process. im working with my project now. Plsssssss help me… Thanks.circuitstoday.com Reliable & Accurate Level Sensors Measurement. Fuel.9/30/12 Water Level Indicator Circuit-Liquid Level Sensor Project Email: doniaaldawlyia2009@yahoo. can i ask a simple diagram or circuit using two sensor to indicate the low and high level of water in an open area? with a converter from 9 volts convert it to 220 volts.com/simple-water-level-idicator 33/37 ..sapconinstrum e nts.com Most Reliable.infine on-de signlink .. Alhambra Street.e lwa. Reply Get Daily Updates via Email Enter your email Subscribe Latest Articles AVR Microcontroller Tutorial – The complete guide to learn AVR Control structures and statements in C and C++ Quick Sorting algorithm with example code in C/C++/Java languages Insertion sorting algorithm with example in C/C++/Java languages Bit rate Vs Baud rate – the common misconception Selection Sort in C/C++/Java programming languages Difference between Procedure Oriented(POP) and Object Oriented Programming(OOP) How to recover/reset admin username and password of Vbulletin forum software What is C++ ? An Introduction to programming with C++ Interfacing ADC to 8051 Sapcon Instruments www. Register now to receive the latest updates! www. Waste and Fresh-Water www.e le ctrose nse . Reply john says: September 12. for example. determining the low and high level of water in a pond.com /Ne ws ELWA Water Level Meters www.com Kingdom of Saudi Arabia Jeddah City. NO Moving Parts. 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