This uses an L293D chip as a motor controller
http://luckylarry.co.uk/arduino-projects/control-a-dc-motor-with-arduino-and-l293d-chip/
http://itp.nyu.edu/physcomp/Labs/DCMotorControl
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
}
}
See also http://www.ecs.umass.edu/ece/m5/tutorials/H-Bridge_tutorial.html
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