#include <IRremote.h>
#include <LiquidCrystal.h>

#define PIN_RECEIVER 2   // Signal Pin of IR receiver

IRrecv receiver(PIN_RECEIVER);

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

int A;
int B;
int result;

void setup()
{
  lcd.begin(16, 2);
  lcd.print("<KALKULATOR IR>");
  receiver.enableIRIn(); // Start the receiver
}

void loop()
{
  // Checks received an IR signal
  if (receiver.decode()) {
    translateIR();
    receiver.resume();  // Receive the next value
    
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Kalkulator IR:");
    lcd.setCursor(0, 1);
    lcd.print(A);
    lcd.setCursor(1, 1);
    lcd.print(" + ");
    lcd.setCursor(4, 1);
    lcd.print(B);
    lcd.setCursor(5, 1);
    lcd.print(" = ");
    lcd.setCursor(8, 1);
    lcd.print(result);
  }
}

void translateIR()
{
  // Takes command based on IR code received
  switch (receiver.decodedIRData.command) {
    case 2:
      B = A;
      A = 0;
      break;
    case 168:
      result = A + B;
      break;
    case 176:
      A = 0;
      B = 0;
      result = 0;
      break;
    case 104:
      A = 0;
      break;
    case 48:
      A = 1;
      break;
    case 24:
      A = 2;
      break;
    case 122:
      A = 3;
      break;
    case 16:
      A = 4;
      break;
    case 56:
      A = 5;
      break;
    case 90:
      A = 6;
      break;
    case 66:
      A = 7;
      break;
    case 74:
      A = 8;
      break;
    case 82:
      A = 9;
      break;
  }
}