#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>

#define PIR_PIN 4
#define LED_PIN 5
#define BUZZER_PIN 10
#define LDR_PIN A0
#define DHT_PIN 3
#define TRIG_PIN 11
#define ECHO_PIN 8

#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LDR_PIN, INPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  Serial.begin(9600);
  dht.begin();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Suhu: ");
}

void loop() {
  // PIR Sensor
  int pirState = digitalRead(PIR_PIN);
  if (pirState == HIGH) {
    Serial.println("Motion detected!");
    digitalWrite(LED_PIN, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);
    delay(5000);
  } else {
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
  }

  // LDR
  int brightness = analogRead(LDR_PIN);
  if (brightness < 250) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }

  // DHT22
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
  } else {
    Serial.print("Humidity: 1  ");
    Serial.print(humidity);
    Serial.print(" %  Temperature: ");
    Serial.print(temperature);
    Serial.println(" *C ");

    lcd.setCursor(6, 0);
    lcd.print(temperature);
    lcd.setCursor(0, 1);
    lcd.print("Humidity: ");
    lcd.print(humidity);
    lcd.print("%");
  }

  // Ultrasonic Sensor
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  long duration = pulseIn(ECHO_PIN, HIGH);
  int distance = duration * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  if (distance < 5) {
    tone(BUZZER_PIN, 500);
    delay(1000);
    noTone(BUZZER_PIN);
  }

  delay(2000);
}