#define ldrpin A0
const float gamma = 0.7;
const float rl10 = 50;
#include <LiquidCrystal.h>
#include <IRremote.h>
#define PIN_RECEIVER 2   // Signal Pin of IR receiver
IRrecv receiver(PIN_RECEIVER);

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  lcd.begin(16, 2);
  // you can now interact with the LCD, e.g.:
  //lcd.print("Hello World!");
  receiver.enableIRIn(); // Start the receiver

}
int power = 0;
void loop() {
  // put your main code here, to run repeatedly:
  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));
  if (receiver.decode()) {
    switch (receiver.decodedIRData.command) {
      case 24:
        if (power == 0) {
          lcd.clear();
          lcd.setCursor(2, 0);
          lcd.print("POWER OFF");
          power = 1;
          digitalWrite(LED_BUILTIN, LOW);
        } else {
          lcd.clear();
          lcd.print("POWER ON");
          power = 0;
          lcd.setCursor(0, 1);
          lcd.print("Lux: ");
          lcd.print(lux);
        }
        break;
    }
    receiver.resume();  // Receive the next value
  }
  if (power == 0) {
    lcd.setCursor(0, 1);
    lcd.print("Lux: ");
    lcd.print(lux);
    digitalWrite(LED_BUILTIN, HIGH);
  }
  //Serial.println(receiver.decodedIRData.command);
  delay(100);

}