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