arduino-L293D

Arduino library for using a L293D motor controller chip

Usage

Download the source:

git clone https://github.com/tylersweat/arduino-L293D.git

and manually install the library. (http://www.arduino.cc/en/Guide/Libraries#toc5)

Setting motor speed

motor.set(255); // Full on forward
motor.set(1.0); // Also full on forward

motor.set(-255); // Full on reverse
motor.set(-1.0); // Also full on reverse

Wiring

For controlling motor speed more than 100% on or off, you must use a PWM enabled pin on the Arduino for the L293D enable pin (ie: pins 3, 5, 6, 9, 10, and 11 on Arduino Uno).

See the L293D datasheet for more information on connecting to the Arduino and to the motor. (http://www.ti.com/lit/ds/symlink/l293.pdf)

Example Arduino sketch

#include <L293D.h>

L293D motor(9,8,7);

setup()
{
}

loop()
{
  // Set motor speed and direction with a double value between -1 and 1
  motor.set(.75); // 75% power forward
  delay(2500);
  motor.set(-.3); // 30% power reverse
  delay(2500);
  // Set motor speed and direction with an int value between -255 and 255
  motor.set(200);
  delay(2500);
  motor.set(-150);
  delay(2500);
  
  // Use motor.get() to get current speed and then update it from that
  motor.set(-255);
  while(motor.get() != 255)
  {
    motor.set(motor.get() + 5); // Increment motor speed from previous speed
    delay(100); // Delay 100ms to see the speed changing
  }
}