IR Remote Control for Presentation PC

// Remote Control For Presentation PC
// Module Pro Micro (AT MEGA 32U4) 16MHz
// NEC protocol only

// Author: Piotr Sylwesiuk
// https://plus.google.com/109581799567307387329

// IR Remote library from https://github.com/z3t0/Arduino-IRremote
// HID library from https://github.com/NicoHood/HID

#include <HID-Project.h>
#include <HID-Settings.h>

#include <boarddefs.h>
#include <IRremote.h>
#include <IRremoteInt.h>

uint8_t ir_code();

// Infrared remote control
#define IR_ADDR 0x00FF // Address
// used keys
#define IR_KEY_3             0xE2  // Vol+
#define IR_KEY_6             0xC2  // Vol-
#define IR_KEY_9             0x90  // Mute
#define IR_KEY_0             0x98  // Play/Pause
#define IR_KEY_STAR          0x68  // ESC
#define IR_KEY_HASH          0xB0  // Shift F5
#define IR_KEY_UP_ARROW      0x18  // Arrow Up
#define IR_KEY_DOWN_ARROW    0x4A  // Arrow Down
#define IR_KEY_RIGHT_ARROW   0x5A  // Arrow Right
#define IR_KEY_LEFT_ARROW    0x10  // Arrow Left
#define IR_KEY_OK            0x38  // F5

// IR Receiver
#define IR_RECEIVER_PIN A2

IRrecv irrecv(IR_RECEIVER_PIN);

void setup() {
  // put your setup code here, to run once:

  // Initializing the infrared receiver
  irrecv.enableIRIn();
  irrecv.blink13(false);

  // Initializing control over the keyboard
  Keyboard.begin();
  Consumer.begin();
}

void loop() {
  // put your main code here, to run repeatedly:
  
  switch(ir_code()){
    case IR_KEY_UP_ARROW    : Keyboard.write(KEY_UP_ARROW); break;
    case IR_KEY_DOWN_ARROW  : Keyboard.write(KEY_DOWN_ARROW); break;
    case IR_KEY_RIGHT_ARROW : Keyboard.write(KEY_RIGHT_ARROW); break;
    case IR_KEY_LEFT_ARROW  : Keyboard.write(KEY_LEFT_ARROW); break;
    case IR_KEY_STAR        : Keyboard.write(KEY_ESC); break;

    // Shift F5
    case IR_KEY_HASH        : Keyboard.press(KEY_LEFT_SHIFT);
                              Keyboard.write(KEY_F5);
                              Keyboard.release(KEY_LEFT_SHIFT); break;
                               
    case IR_KEY_OK          : Keyboard.write(KEY_F5); break;
    case IR_KEY_9           : Consumer.write(MEDIA_VOLUME_MUTE); break;
    case IR_KEY_3           : Consumer.write(MEDIA_VOLUME_UP); break;
    case IR_KEY_6           : Consumer.write(MEDIA_VOLUME_DOWN); break;
    case IR_KEY_0           : Consumer.write(MEDIA_PLAY_PAUSE); break;
  }
}

// ----------------------------------------------------------
uint8_t ir_code() {
  decode_results irResults; // Here we store the results
  uint16_t irCode = 0;
  static uint8_t irTmp = 0;

  if (irrecv.decode(&irResults)) {
    if ((irResults.decode_type == NEC) && (!irResults.overflow)) {
      if ((irResults.bits == 32) && (((irResults.value & 0xffff0000)>>16) == IR_ADDR)) {
        irCode = irResults.value & 0x0000ffff;
        irTmp = (~(irCode & 0x00ff))& 0x00ff;
        irCode >>= 8;
        if (!(irCode == irTmp)) irCode = irTmp = 0;
        
             // Recognition of the code repetition of the pressed remote control button.
      } else if ((irResults.bits == 0) && (irResults.value == 0xffffffff) && (irTmp != 0)) {
        
          // Autorepeat for Vol+ and Vol- (IR_KEY_3 and IR_KEY_6)
          if((irTmp==IR_KEY_3)||(irTmp==IR_KEY_6)) irCode=irTmp; else irCode = 0xff; 
          
      } else irCode = irTmp = 0;
    } else irCode = irTmp = 0;
    irrecv.resume(); // Prepare for the next value
    return (irCode);
  } else {
    irCode = 0;
    return (irCode);
  }
}