#include <Servo.h>

Servo myServo;

int sensor = 2;  

bool kereta = false; 

void setup() {
  myServo.attach(9); 
  pinMode(sensor, INPUT);  
}

void loop() {
  if (digitalRead(sensor) == HIGH) {
    kereta = true;
  } 
else {
    kereta = false;
  }

if (kereta) {
    tutupPalang();
    delay(5000); 
    bukaPalang();
  }
}

void tutupPalang() {
  for (int pos = 0; pos <= 90; pos += 1) {
    myServo.write(pos);  
    delay(50); 
  }
}

void bukaPalang() {
  for (int pos = 90; pos >= 0; pos -= 1) {
    myServo.write(pos); 
    delay(50);  
  }
}