#include <LiquidCrystal.h>
const float GAMMA = 1.2;
const float RL10 = 20.0;

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
void setup() {
  // put your setup code here, to run once:
    Serial.begin(115200);
    lcd.begin(16, 2);
    pinMode(2, OUTPUT);
}

void loop() 
{
  // Convert the analog value into lux value:
  int analogValue = analogRead(A0);
  float voltage = float(analogValue) / 1024.0 * 5.0;
  float resistance = 2000.0 * voltage / (1.0 - voltage / 5.0);
  float lux = pow(RL10 * 1e3 * pow(10.0, GAMMA) / resistance, (1.0 / GAMMA));

  if(isfinite(lux))
  {

    if(lux >= 20.00)
    {
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Light!");

      digitalWrite(2, LOW);
    }
    else
    {
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Dark!");

      digitalWrite(2, HIGH);
    }
  }
  else
  {
    Serial.println("Too bright to measure");
  }

  delay(1000);


  
}