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Introduction 

The L293D is a 16-pin Motor Driver IC which can control a set of two DC motors simultaneously in any direction.
The L293D is designed to provide bidirectional drive currents of up to 600 mA (per channel) at voltages from 4.5 V to 36 V (at pin 8!). You can use it to control small dc motors - toy motors. Sometimes it can be extremely hot.

​In this tutorial you will learn how to use it with Arduino uno to control two dc motors.
​

What you will need - Hardware

For this tutorial you will need:

The Circuit
L293 IC Motor Driver PInout 
​
The connections are easy, see the image above with the breadboard circuit schematic.

The code

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//L293D
//Motor A
const int motorPin1  = 5;  // Pin 14 of L293
const int motorPin2  = 6;  // Pin 10 of L293
//Motor B
const int motorPin3  = 10; // Pin  7 of L293
const int motorPin4  = 9;  // Pin  2 of L293

//This will run only one time.
void setup(){
    //Set pins as outputs
    pinMode(motorPin1, OUTPUT);
    pinMode(motorPin2, OUTPUT);
    pinMode(motorPin3, OUTPUT);
    pinMode(motorPin4, OUTPUT);
    //Motor Control - Motor A: motorPin1,motorpin2 & Motor B: motorpin3,motorpin4
    //This code  will turn Motor A clockwise for 2 sec.
    digitalWrite(motorPin1, HIGH);
    digitalWrite(motorPin2, LOW);
    digitalWrite(motorPin3, LOW);
    digitalWrite(motorPin4, LOW);
    delay(2000); 
    //This code will turn Motor A counter-clockwise for 2 sec.
    digitalWrite(motorPin1, LOW);
    digitalWrite(motorPin2, HIGH);
    digitalWrite(motorPin3, LOW);
    digitalWrite(motorPin4, LOW);
    delay(2000);
    
    //This code will turn Motor B clockwise for 2 sec.
    digitalWrite(motorPin1, LOW);
    digitalWrite(motorPin2, LOW);
    digitalWrite(motorPin3, HIGH);
    digitalWrite(motorPin4, LOW);
    delay(2000); 
    //This code will turn Motor B counter-clockwise for 2 sec.
    digitalWrite(motorPin1, LOW);
    digitalWrite(motorPin2, LOW);
    digitalWrite(motorPin3, LOW);
    digitalWrite(motorPin4, HIGH);
    delay(2000);    
    //And this code will stop motors
    digitalWrite(motorPin1, LOW);
    digitalWrite(motorPin2, LOW);
    digitalWrite(motorPin3, LOW);
    digitalWrite(motorPin4, LOW);
}
void loop(){
}
Download the code from here and open it with Arduino IDE.
l293_tutorial.zip
File Size: 0 kb
File Type: zip
Download File
You can keep playing with that, for example try to combine parts of code to move both motors simultaneously.
​
Try to use analogWrite(pin, PWM value) instead digitalWrite(pin, HIGH/LOW) to control the speed of motors!

Well done!

You have successfully completed one more Arduino "How to" tutorial and you learned how to use the L293D motor driver IC to control two dc motors with the Arduino uno board.

I hope you liked this, let me know in the comments!

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