#include <LiquidCrystal.h>

const int trigPin = 2;  // Pin trig untuk sensor ultrasonik
const int echoPin = 3;  // Pin echo untuk sensor ultrasonik
const int fanPin = 9;  // Pin untuk mengontrol kipas

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(fanPin, OUTPUT);

  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
  lcd.print("Kipas Otomatis");
  lcd.setCursor(0, 1);
  lcd.print("Sensor Ultrasonik");
  delay(2000);
  lcd.clear();
}

void loop() {
  int distance = getDistance();
  lcd.setCursor(0, 0);
  lcd.print("Jarak: ");
  lcd.print(distance);
  lcd.print(" cm");
  if (distance < 20) { // Jika jarak kurang dari 20 cm, maka kipas akan menyala
    digitalWrite(fanPin, HIGH);
    lcd.setCursor(0, 1);
    lcd.print("Kipas Menyala");
  } else {
    digitalWrite(fanPin, LOW);
    lcd.setCursor(0, 1);
    lcd.print("Kipas Mati");
  }
  delay(50);
}

int getDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  int duration = pulseIn(echoPin, HIGH);
  int distance = duration * 0.034 / 2;
  return distance;
}