#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#define LDR_PIN 12
LiquidCrystal_I2C lcd(0x27, 20, 4);
// byte LDR_PIN = 12;
int led_pin = 19;
byte pir_pin = 14;
byte buzzerpin = 26;
byte dht_pin = 27;
const int triggerpin = 4;
const int echopin = 25;
DHT dht(dht_pin, DHT22);
void setup() {
  pinMode(LDR_PIN, INPUT);
  pinMode(led_pin, OUTPUT);
  pinMode(buzzerpin, OUTPUT);
  pinMode(pir_pin, INPUT);
  dht.begin();
  lcd.init();
  lcd.backlight();
}
void loop() {
  // ldr sensor

  // lcd.setCursor(2, 0);
  // lcd.print("Room: ");
  if (digitalRead(LDR_PIN) == LOW) {
    lcd.setCursor(0,3);
    lcd.print("Light!");
    digitalWrite(led_pin, LOW);
  } else {
    lcd.setCursor(0, 3);
    lcd.print("Dark ");
    digitalWrite(led_pin, HIGH);
  }
  // pir sensor----------------
  int sensorValue = digitalRead(pir_pin);
  Serial.println(sensorValue);

  if (sensorValue == HIGH) {
    lcd.setCursor(0, 2);
    digitalWrite(buzzerpin, HIGH);
    lcd.print("motion detected");
    Serial.println("motion detected");
  }
  else {
    lcd.setCursor(0, 2);
    digitalWrite(buzzerpin, LOW);
    lcd.print("motion false");
  }

  //  dht sensor ------------------------
  lcd.setCursor(0, 1);
  float temperature = dht.readTemperature();
  lcd.print("Temp:" + String(temperature));


  // ultrasonic sensor------------------------
  digitalWrite(triggerpin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerpin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerpin, LOW);

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

  // lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Distance: " + String(distance, 0) + "cm");


  delay(1000);
}