Interfacing DC Motor to 8051 Microcontroller Using AT89S51

20/10/2013Interfacing DC motor to 8051 microcontroller using AT89S51 Home Forums Datasheets Lab Manual Testing Components Buy Project Kits Electronic Circuits and Diagram-Electronics Projects and Design Search Custom Search ► DC Motor ► Microcontroller ► Circuit Projects ► Circuit Diagram Interfacing DC motor to 8051 admin July - 4 - 2012 13 Comments Pwm Dc Motor Control www.Analog.com/Power-App-Bulletin Save Your System From Overvoltage Faults. Get ADI Power Guide Here. This article shows how to interface a DC motor to an 8051 microcontroller. Interfacing DC motor to 8051 forms an essential part in designing embedded robotic projects. A well designed 8051-DC motor system has essentially two parts. Firstly an 8051 with the required software to control the motor and secondly a suitable driver circuit. Most of the DC motors have power requirements well out of the reach of a microcontroller and more over the voltage spikes produced while reversing the direction of rotation could easily damage the microcontroller. So it is not wise to connect a DC motor directly to the microcontroller. The perfect solution is to use a motor driver circuit in between the microcontroller and the DC motor. L293 motor driver. L293 is a dedicated quadruple half H bridge motor driver IC available in 16 pin package. To know more about H bridge, check this link. H bridge motor driver circuit. L293 has a current capacity of 600mA/channel and has supply voltage range from 4.5 to 36V DC. They are fitted with internal high speed clamp diodes for inductive spike protection. Other good features of L293 are high noise immunity, internal ESD protection, thermal shutdown, separate input supply for each channel etc. The pinout and truth table of an L293 motor driver is shown in the figure below. L293 pinout and function diagram Bi directional DC motor using 8051. This project describes a bidirectional DC motor that changes its direction automatically after a preset amount of time (around 1S). www.circuitstoday.com/interfacing-dc-motor-to-8051 1/10 This makes the motor to run in the anti clockwise direction for the same duration and the entire cycle is repeated. W A I T 2 D J N ZR 4 . Then the logic of P1.circuitstoday. C2 and X1 are related to the oscillator. S1 and C3 forms a debouncing reset circuitry.1 controls the direction of the motor. # 0 0 0 0 0 0 0 1 B/ /m o t o rr u n sc l o c k w i s e A C A L LD E L A Y/ /c a l l st h e1 SD E L A Y M O VP 1 . W A I T 3 D J N ZR 3 .1 will be low. www.com/interfacing-dc-motor-to-8051 2/10 . Initially when power is switched ON. C1.1 are swapped and this condition is also maintained for the same duration . This condition is maintained for a preset amount of time (around 1S) and for this time the motor will be running in the clockwise direction (refer the function table of L293).0 and P1.0 and 3. The software is so written that the logic combinations of P1. O R G0 0 H/ /i n i t i a ls t a r t i n ga d d r e s s M A I N :M O VP 1 . Resistors R2 and R3 are the pull down resistors for P3. Program.1 respectively.0 will be high and P1. # 0 0 H W A I T 2 :M O VR 2 . These pushbutton switches are interfaced to P0rt 3 of the microcontroller. # 0 0 0 0 0 0 1 0 B/ /m o t o rr u n sa n t ic l o c k w i s e A C A L LD E L A Y/ /c a l l st h e1 SD E L A Y S J M PM A I N/ /j u m p st ol a b e lM A I Nf o rr e p a e t i n gt h ec y c l e D E L A Y :M O VR 4 .1 are connected to the corresponding input pins of the L293 motor driver. Bi directional DC motor using 8051 In the circuit components R1. Circuit diagram is shown below. The motor is connected across output pins 3 and 6 of the L293.0 and P1. The circuit shown below is of an 8051 based bi directional motor whose direction can be controlled using 2 push button switches. # 0 F H W A I T 1 :M O VR 3 . The circuit is very similar to the previous one except for the two push button switches . Port pins P1.0 and P1.20/10/2013 Interfacing DC motor to 8051 microcontroller using AT89S51 AT89S51 is the microcontroller used here and L293 forms the motor driver. # 0 0 H W A I T 3 :D J N ZR 2 . W A I T 1 R E T E N D Bidirectional motor with pushbutton control. P1. So do not use a motor that consumes more than that. # 0 0 0 0 0 0 1 0 B/ /m a k e st h em o t o rt or u na n t ic l o c k w i s e L A B E L 2 : S J M PM A I N/ /j u m p sb a c kt ot h eM A I Nl o o p E N D About the program.0 goes high and P1. To check S3. L A B E L 2/ /c h e c k sw h e t h e rS 3i sp r e s s e d M O VP 1 . If the operands are not equal that means the S2 is not pressed and the controller jumps to LABEL1 which is to check the S3. www. # 0 0 0 0 0 0 0 0 B/ /c l e a r sP 1f o rk e e p i n gt h em o t o rO F Fi n i t i a l l y M A I N : M O VA .#00000010B) which makes the motor run anti clockwise is executed. Both operands are equal means the S3 is pressed and the next instruction (MOV P1. # 0 0 0 0 0 0 0 1 B .20/10/2013 Interfacing DC motor to 8051 microcontroller using AT89S51 Push button controlled bi-directional DC motor The code for the above project is so written that initially when power is switched ON. status of P3 is moved to A again and it is compared with 00000010B using the CJNE instruction. The maximum current capacity of L293 is 600mA/channel. Checking whether a particular push button is pressed is done using the CJNE (compare and jump if not equal) instruction. In simple words the CJNE instuction compares two operands and jump to a predefined LABEL if the operands are not equal. Whenever push button S2 is pressed the status of P3 will be 00000001B . Program.This status is moved to accumulator A and compared with 00000001B using the CJNE instruction. L A B E L 1/ /c h e c k sw h e t h e rS 2i sp r e s s e d M O VP 1 . the motor remains OFF. # 0 0 0 0 0 0 1 0 B . # 0 0 0 0 0 0 0 0 B/ /i n i t i a t e sP 3a st h ep u s h b u t t o ni n t e r f a c e M O VP 1 . # 0 0 0 0 0 0 0 1 B/ /m a k e st h em o t o rr u nc l o c k w i s e L A B E L 1 : C J N EA .0 and P1.1 toggles making the motor to run in the opposite direction and this condition is maintained until the next press of S2. When push button switch S3 is pressed the logic of P1. Both operands are equal means S2 is pressed and the next instruction (MOV P1.circuitstoday.#00000001B) which makes the motor run clockwise is executed. Notes. P 3/ /m o v e st h ec u r r e n ts t a t eo fP 3t oA c c u m u l a t o r C J N EA .1 remains low. When push button switch S2 is pressed P1.com/interfacing-dc-motor-to-8051 3/10 . If the two operands are equal nothing happens and the next instruction is executed. Both operands are not equal means S3 is not pressed and the controller goes to check S2 again and this cycle is repeated. The motor runs in the clockwise direction and this condition is maintained until S3 is pressed. O R G0 0 H/ /i n i t i a l ls t a r t i n ga d d r e s s M O VP 3 . You may also like: Interfacing hex keypad to 8051 Delay using 8051 timer Software delay routine in 8051 microcontroller Random number generator using 8051 Voltmeter using 8051 We recommend: 1KHz IR transmitter circuit.20/10/2013 Interfacing DC motor to 8051 microcontroller using AT89S51 The supply voltage range of L293 is between 4. So you can use a motor falling in that range.com/interfacing-dc-motor-to-8051 4/10 .5 and 36V DC.circuitstoday. Voltmeter circuit using LED Digital compass circuit 20W audio amplifier using LM1875 4 X 15 Watt power amplifier Search Custom Search Posted in 8051 Tags: interfacing DC motor to 8051 Leave a Reply Name (required) Mail (will not be published) (required) Website Submit Comment 13 Responses to “Interfacing DC motor to 8051” www. . Every time I read your article…. or . 2012 at 7:07 am Thank you Manu. In proteus you have to add that . Reply Hareem Ashraf says: May 3..asm file or just copy and paste the program and send to Micro controller. pleas reply me quickly as possible.exe . 2012 at 1:47 am Thanks Jojo…. 2013 at 1:00 am thanks for such a nice explanation….. 2013 at 8:39 am Hello sir.com/interfacing-dc-motor-to-8051 5/10 . but some missfiring is occuring .circuitstoday. for one year onwards i’m working to design one auto programmable dental furmace with 555 timer ic & h bridge using p& n channel mos: . Reply Khan says: April 28.It Let me Know lot of Knowledgeable stuffs …. 2012 at 7:06 am Thank you Elex for the nice words www. how we can send the above program to Micro controller and in what format? for example run the program on MASM and then send .Great Article Reply jojo says: July 9.hex file of your code. i hope you can help me. I enjoyed reading it Reply dd_student says: February 22. from the time being i’m searching for a microcontroller circuit for controlling each & every action and now i’m very happy to get 8051 circuits. You can use Keil for this purpose. says: July 5.20/10/2013 Interfacing DC motor to 8051 microcontroller using AT89S51 archana says: September 19.hex file in your micro controller’s program file. and i made it working. Hope your new attempt would work well Reply Elex Wood says: July 5. 2013 at 4:45 am You have to create a . Reply Nora says: April 22. 2012 at 11:57 pm Dear Sir. 2013 at 11:07 am Nice work. 2013 at 1:21 am I’m using stepper motor instead of DC motor.obj . .once more i’m thanking you… Reply jojo says: July 9.\ what is the interfacing of Stepper motor to 8051?I’M BUILDING A MATURE OF THREE STOREY’s elevator Reply Manu. org/wiki/Assembly_language Reply Get Daily Updates via Email Enter your email Subscribe Latest Articles Object counter using 8051 Zener Diode – Invention History & Story Behind the Development Shockley Diode – Invention History Digital Count Down Timer using PIC Microcontroller Digital Voltmeter using Micro Controller PIC16F73A DatasheetLib – A new Datasheet Database Website to revolutionize Datasheet Discovery Solar Cell – Invention History & Story – From Selenium to Silicon Vacuum Tube Invention History and Story behind Invention Integrated Circuit Invention History and Story Behind the Scenes Introduction to MATLAB Tutorial www. 2012 at 4:28 pm VERY GOOD ARTICLE. 2012 at 1:31 am very good article.com/interfacing-dc-motor-to-8051 6/10 .I learned a lot.. Read more here:. 2012 at 7:05 am The codes are written in assembly language.wikipedia. 2012 at 7:46 pm @MROHM – Thanks for the nice words Reply MROHM says: July 4..20/10/2013 Interfacing DC motor to 8051 microcontroller using AT89S51 Reply jojo says: July 4.http://en.circuitstoday.but which programming language have you used Reply jojo says: July 9.Thanks!!! 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