Control a DC motor speed with Arduino and a MOSFET - Increasing speed

motor-with-mosfet-increasing-speed.ino

const int motorpin = 5;
int motor_speed = 0;

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

void loop()
{
  for(motor_speed = 0; motor_speed <= 255; motor_speed += 5)
  {
    printSpeed(motor_speed);
    analogWrite(motorpin, motor_speed);
    delay(250);
  }
  delay(5000);
}

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