arduinonana.c

int pin1, pin2, pin3;

int currentPos = 0; // posisi derajat aervo
int currentState = NULL;

int SPIN = 1;
int STOP = 2;
int RESET = 3;

loop() {
  pin1 = digitalRead(PIN1);
  pin2 = digitalRead(PIN2);
  pin3 = digitalRead(PIN3);
  
  if (pin1 == HIGH) {
    currentState = SPIN;
  } else if (pin2 == HIGH) {
    currentState = STOP;
  } else if (pin3 == HIGH) {
    currentState = RESET;
  }
  
  Serial.print("State: ");
  Serial.println(currentState);
  
  if (currentState == SPIN) {
    // putar terus sampe 180°
    if (currentPos + 1 <= 180) {
      currentPos += 1;
      myservo.write(currentPos);
    }
  } else if (currentState == STOP) {
      // do nothing
  } else if (currentState == RESET) {
    // balikin ke 0°
    if (currentPos - 1 >= 0) {
      currentPos -= 1;
      myservo.write(currentPos);
    }
  }
  delay(15);
}