#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
Servo myServo;
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Define the pins for the ultrasonic sensor
const int trigPin = 8;
const int echoPin = 9;

// Define the pin for the servo motor
const int servoPin = 11;

// Variables for the duration and distance
long duration;
int distance;

// ----------------------------------------------------------------
void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  lcd.setCursor(0,0);
  lcd.print(" TEMPAT  SAMPAH  ");
  lcd.setCursor(0,1);
  lcd.print("      OTOMATIS      ");
  delay(1500);
  lcd.clear();

  myServo.attach(11);
  myServo.write(0);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  delay(1000);
}

void loop() {
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(2);
  digitalWrite(trigPin, LOW);
  delayMicroseconds(10);
  digitalWrite(trigPin, HIGH);

  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  // Print the distance to the serial monitor
  Serial.print("Jarak: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Display the distance on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Jarak: ");
  lcd.print(distance);
  lcd.print(" cm");

  if (distance < 20) {
    myServo.write(90); 
    Serial.println("TERBUKA");
    lcd.setCursor(0, 1);
    lcd.print("TERBUKA");
  } 
  else {
    myServo.write(0);  
    Serial.println("TERTUTUP");
    lcd.setCursor(0, 1);
    lcd.print("TERTUTUP");
  }

  delay(500);
}