Controlling a DC motor using L293

[SevenZero]

Here is the circuit diagram which you need to use to connect the motor to L293.

l293d.gif (9.48 KiB) Viewed 2872 times

Simple Arduino wiring diagram

dcmotor.png (167.95 KiB) Viewed 2872 times

Sample source code:

Code: Select all

int switchPin = 2; // switch input
int motor1Pin1 = 3; // pin 2 on L293D
int motor1Pin2 = 4; // pin 7 on L293D
int enablePin = 9; // pin 1 on L293D

void setup() {
    // set the switch as an input:
    pinMode(switchPin, INPUT);

    // set all the other pins you're using as outputs:
    pinMode(motor1Pin1, OUTPUT);
    pinMode(motor1Pin2, OUTPUT);
    pinMode(enablePin, OUTPUT);

    // set enablePin high so that motor can turn on:
    digitalWrite(enablePin, HIGH);
}

void loop() {
    // if the switch is high, motor will turn on one direction:
    if (digitalRead(switchPin) == HIGH) {
        digitalWrite(motor1Pin1, LOW); // set pin 2 on L293D low
        digitalWrite(motor1Pin2, HIGH); // set pin 7 on L293D high
    }
    // if the switch is low, motor will turn in the opposite direction:
    else {
        digitalWrite(motor1Pin1, HIGH); // set pin 2 on L293D high
        digitalWrite(motor1Pin2, LOW); // set pin 7 on L293D low
    }
}