Control a DC motor speed with Arduino and a MOSFET - Three speeds

motor-with-mosfet-three-speed.ino

const int motorpin = 5;
const int divider = 3;
int motor_speed = 0;

void setup()
{
  Serial.begin(57600);
  pinMode(motorpin, OUTPUT); 
}

void loop()
{
  for(motor_speed = 0; motor_speed <= 255; motor_speed += (int)(255/divider))
  {
    printSpeed(motor_speed);
    analogWrite(motorpin, motor_speed);
    delay(5000);
  }
}

void printSpeed(int motor_speed)
{
  Serial.print("Current Speed: ");
  Serial.println(motor_speed);
}