Controlling a Motor

Powering a Motor

Pictured above is a diagram for connecting a motor to an Arduino. The Motor in our example is connected to digital pin 9. The following code will cause the motor to speed up and slow down.

/*Motor Speed Demonstration
* This program demonstrates adjusting the speed of a
* Motor connected to digital pin 9

/*Pin Motor is connected to*/
int Motor1 = 9;          

// the setup routine runs once when you press reset:
void setup() {

  // declare pin 9 to be an output:
  pinMode(Motor1, OUTPUT);

/*SetMotorSpeed is a function that uses the 
*analog write function to set the speed of the 
*Motor.  It takes two arguments, the pin#
*and the speed (0 - 255)
void SetMotorSpeed(int Motor,int Speed){

// the loop routine runs over and over again forever:
void loop() {
  //This first for loop incrementally increases
  //The Speed
  for(int Speed1=50;Speed1<256;Speed1++){
    SetMotorSpeed(Motor1, Speed1);

  //this for loop decreases the speed
  for(int Speed2=255;Speed2>50;Speed2--){
      SetMotorSpeed(Motor1, Speed2);