// Filename: spin_DC_motor.ino   PWM control of DC motor speed

int motorPin = 3;   // Connect the DC motor to PWM Pin 3

void setup( ) {
  pinMode(motorPin, OUTPUT);     // Set motor pin to output mode
}

void loop( )  {
   analogWrite(motorPin, 150);   // Motor at 150/255 of full speed
   delay(2000);
   analogWrite(motorPin, 250);   // Motor at 250/255 of full speed
   delay(2000);
}