#include <LiquidCrystal_I2C.h>

#define LCD_ADD 0X27
const uint8_t ROWS = 2;
const uint8_t COLS = 16;
const float GAMMA = 0.7;
const float RL10 = 50;

LiquidCrystal_I2C lcd(LCD_ADD, COLS, ROWS);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  pinMode(11, OUTPUT);
  pinMode(13, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:

int analogValue = analogRead(A0);
Serial.println(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));
int lux = map(analogValue,0,1024,0,255);
// int lux2 = map(lux1,0,)
analogWrite(11,lux);
// Serial.println("lux:" +String(lux));
// Serial.println(lux1);
if(isfinite(lux)){
  if(digitalRead(13) == LOW){
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Room : Light");
    lcd.setCursor(0,1);
    lcd.print("LUX: "+String(lux));

  }else {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Room: Dark");
    lcd.setCursor(0,1);
    lcd.print("LUX: "+String(lux));
    // analogWrite(11,lux1);
    
    // digitalWrite(11,HIGH);
  }
}else{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Too bright");
}
delay(500);
}