SIMPLE INTERFACING OF DC MOTOR TO 8051

SIMPLE INTERFACING OF DC MOTOR TO 8051

• In this method we are using a Motor driver IC (L293D). It is Driver which provide supply to motor (up to 12V) and prevent the microcontroller from motor Back EMF problem.

• In our program we are using 3 pin of L293D that are en1, in1 and in2 for driving a motor. We must give a supply of 6V or 12V to Vss pin and 5V to Vs pin.

• In1 and in2 are two pin which control the clockwise direction of motor.

• En1 pin enable in1 and in2 or enable one side of IC’s Bridge, because it has two bridge which are control by en1 and en2.

• En1 control in1 and in2, En2 control in3 and in4 pin of IC.

• So we have assigned the Pin of Port0 i.e. P0.0 = in1, P0.1 = in2,P0.2 = en1.

• So to enable the circuit en1 must always be 1 or (high).

• And for Clockwise in1 = 1 and in2 = 0.

• For Counter-Clockwise in1= 0 and in2 = 1.

• So here is program for DC motor.

//--------------------------------------------------------------------------------------------------------//

#include<reg51f.h>

sbit in1 = P0^0;     //----Assigning Pin0 of PORT 0 as input 1 for motor

sbit in2 = P0^1;     //----Assigning Pin1 of PORT 0 as input 2 for motor

sbit en1 = P0^2;    //----Assigning Pin2 of PORT 0 as input 3 for enabling the driver IC

//--------Main Program-----------//

void main()

{

P0 = 0x00;           //----Assigning Port 0 as Output

en1 = 1;               //----Driver IC is enabled

while(1)               //----Creating Super loop

{

//-----To rotate motor in clockwise direction----//

in1 = 1;               //----Input 1 given as high

in2 = 0;               //----Input 2 given as low

}                        //----End of Super loop

}

//---------End of main program--------//

//---------------------------------------------------------------------------------------------------------//

Program:click for code

For video on above example:Click for video