ardEdu-dcMotor.ino

/*
This sketch is from the Adafruit Arduino series by Simon Monk.
Additional comments added by Jonathan Prozzi.
Adafruit Arduino - Lesson 13. DC Motor
*/

int motorPin = 3; // set the pin that controls the motor. this is the one that attachs to the resistor
 
void setup() 
{ 
  pinMode(motorPin, OUTPUT);
  Serial.begin(9600); // open the serial monitor so that you can input the speed value
  while (! Serial);
  Serial.println("Speed 0 to 255");
} 
 
 
void loop() 
{ 
  if (Serial.available()) // as long as the Serial monitor is available, enter the motor speed
  {
    int speed = Serial.parseInt();
    if (speed >= 0 && speed <= 255) // check to make sure that the value entered falls in the actual range
    {
      analogWrite(motorPin, speed); // this writes the speed value to the motor, causing it to rotate
    }
  }
}