Arduino 101-02 Motor Control

gistfile1.c

int motorPin = 9;
int potPin = 0;
int lastValue = 0;
int motorSpeed = 0;
int delayTime = 250;

void setup() {
  Serial.begin(9600);
  pinMode(motorPin, OUTPUT);
  analogWrite(motorPin, motorSpeed);
}

void loop() {
  int value = readPot();
  updateSerial(value);
  updateMotor(value);
  delay(delayTime);
}

int readPot(){
  return constrain(analogRead(potPin) / 4, 0, 255);
}

void updateSerial(int new_value){
  if (lastValue != new_value) {
    lastValue = new_value;
    Serial.println(lastValue);
  }
}

void updateMotor(int newSpeed) {
  if (motorSpeed != newSpeed) {
    motorSpeed = newSpeed;
    analogWrite(motorPin, motorSpeed);
  }
}