Arduino iRemote example for sending remote control commands to a LG Home Theater from the serial port

lg_remote.ino

/*
 * IRremote: IRsendDemo - demonstrates sending IR codes with IRsend
 * An IR LED must be connected to Arduino PWM pin 3.
 * Version 0.1 July, 2009
 * Copyright 2009 Ken Shirriff
 * http://arcfn.com
 */


#include <IRremote.h>

IRsend irsend;

// from https://github.com/z3t0/Arduino-IRremote/issues/263#issuecomment-274958604
/* ------------------------------------ */

// Reverse the order of bits in a byte
// Example: 01000000 -> 00000010
unsigned char ReverseByte(unsigned char b)
{
  b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
  b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
  b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
  return(b);
}

// Calculate 32 bit NECx code
unsigned long GenNECXCode(unsigned char p_Device, unsigned char p_SubDevice, unsigned char p_Function)
{
  unsigned long ReverseDevice = (unsigned long)ReverseByte(p_Device);
  unsigned long ReverseSubDevice = (unsigned long)ReverseByte(p_SubDevice);
  unsigned long ReverseFunction = (unsigned long)ReverseByte(p_Function);
  return((ReverseDevice << 24) | (ReverseSubDevice << 16) | (ReverseFunction << 8) | ((~ReverseFunction) & 0xFF));
}
/* ------------------------------------ */

int LG_BITS = 32;
#define LG_POWER_ON  GenNECXCode(45,45,48)
#define LG_AV  GenNECXCode(45,45,176)
#define LG_MODE_DVD  GenNECXCode(45,45,241)
#define LG_POWER  GenNECXCode(44,44,30)

void setup()
{
  Serial.begin(9600);
}

void loop() {
/*	for (int i = 0; i < 3; i++) {
		irsend.sendLG(LG_POWER, LG_BITS);
		delay(40);
	}
*/
if(Serial.available() > 0) {
  Serial.println("LG IR code:");
     String str = Serial.readStringUntil('\n');
     unsigned long command = GenNECXCode(44,44, str.toInt());
     for (int i = 0; i < 3; i++) {
         irsend.sendLG(command, LG_BITS);
         delay(40);
     }
}

	delay(40); //5 second delay between each signal burst
}