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

const int ldrPin =36;
const int relayPin =26;
const int ledPin = 25;
const int buzzerPin =27;
const int servoPin = 23;
const float GAMMA = 0.7;
const float RL10 = 50;

LiquidCrystal_I2C lcd(0x27, 16, 2);

Servo myServo;

//int ldrThreshold = 500;

void setup() {
  //lcd.begin(115200);
  lcd.init();
  lcd.backlight();


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

pinMode(ldrPin, INPUT);
pinMode(relayPin, OUTPUT);
pinMode(ledPin, OUTPUT);
pinMode(buzzerPin, OUTPUT);

}

void loop() {
  int analogValue = analogRead(A0);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  lcd.setCursor(2, 0);
  lcd.print("Room: ");
  if (lux > 50) {
    lcd.print("Light!");
  } else {
    lcd.print("Dark  ");
  }

  lcd.setCursor(0, 1);
  lcd.print("Lux: ");
  lcd.print(lux);
  lcd.print("          ");

  delay(1000);
}