//Lab12 LDR+LCD
#include <LiquidCrystal_I2C.h> //libabry LiquidCrystal_I2C ke dalam program
int ldrPin = A0; //
int ledPin = 2; //
const float GAMMA = 0.7; //
const float RL10 = 50; //

LiquidCrystal_I2C lcd(0x27, 16, 2); //

void setup() {
  // put your setup code here, to run once:
  pinMode(ledPin, OUTPUT); //inisialisai ledPin sebagai pin output
  lcd.init(); //
  lcd.backlight(); //
}

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(0, 0); //
  lcd.print("Room: "); //
  if(lux > 500){ //
    lcd.print("Light"); //
    digitalWrite(ledPin, LOW); //
  }
  else{ //j
    lcd.print("Drak "); //
    digitalWrite(ledPin, HIGH); //
  }

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

  delay(100);
}