#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>

#define LDR_PIN 17
#define LIGHT_PIN 26
#define TRIG_PIN 14
#define ECHO_PIN 12
#define SERVO_PIN 35 // Replace with the GPIO pin connected to the servo

LiquidCrystal_I2C lcd(0x27, 20, 4);

Servo myServo; // Create a servo object

void setup() {
  Serial.begin(115200);
  // Day Night mode
  pinMode(LDR_PIN, INPUT);
  pinMode(LIGHT_PIN, OUTPUT);

  // Ultrasonic Sensor
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  lcd.init();
  lcd.backlight();
  digitalWrite(LIGHT_PIN, LOW);
  myServo.attach(SERVO_PIN); // Attach the servo to the specified pin
}

void loop() {

  // Trigger the ultrasonic sensor
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Read the duration of the echo pulse
  long duration = pulseIn(ECHO_PIN, HIGH);

  // Calculate the distance in centimeters
  int distance = duration * 0.034 / 2;
  Serial.println(distance);

  if(distance < 40){
    myServo.write(100); // Set servo position based on angle (0 to 180)
    delay(15);
  }else{
    myServo.write(0); // Set servo position based on angle (0 to 180)
    delay(15);
  }

  lcd.setCursor(2, 0);
  if (digitalRead(LDR_PIN) == LOW) {
    lcd.print(" Evening Time!    ");
    lcd.print("   Bulb ON      ");  
    digitalWrite(LIGHT_PIN, HIGH);
  } else {
    lcd.print("   Day Time!     ");
    lcd.print("     Bulb OFF      ");  
    digitalWrite(LIGHT_PIN, LOW);
  }
  delay(100);
}