Arduinoを赤外線リモコンにするスケッチ。 とりあえず家電協とNECフォーマットに対応。たぶんSONYフォーマットにも対応させます。

ir_send.ino

/*
#        DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE 
#                    Version 2, December 2004 
#
# Copyright (C) 2013  Yoshihiro TSUBOI <ytsuboi-at-gmail.com>
#
# Everyone is permitted to copy and distribute verbatim or modified 
# copies of this license document, and changing it is allowed as long 
# as the name is changed. 
#
#            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE 
#   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 
#
#  0. You just DO WHAT THE FUCK YOU WANT TO.

Reffered: http://elm-chan.org/docs/ir_format.html
Reffered: http://hello-world.blog.so-net.ne.jp/archive/20110512

*/

#define IR_LED  7

void setup()  { 
  pinMode( IR_LED, OUTPUT );
}

unsigned char data[6] = {0xAA, 0x5A, 0x8F, 0x12, 0x16, 0xD1}; // AQUOS 0xAA 0x5A 0x8F 0x12 0x16 0xD1
// unsigned char data[4] = {0x40, 0xBF, 0x12, 0xED}; // REGZA 0x40 0xBF 0x12 0xED

void loop() {
  sendIrAEHA();  // AQUOS
  // sendIrNEC();      // REGZA
  while(1);
}

void sendIrAEHA() {
  // T=425us
  const int dataCount = sizeof data /sizeof data[0];
  irPulse( 3400, 1700 );        // Leader
  for (int i=0; i<dataCount; i++) {
    for (int j=0; j<8; j++) irPulse( 425, (data[i]>>j)%2 ? 1275:425 );  // Data
  }
  irPulse( 425, 68000 );  // wait
  irPulse( 3400, 1700 );  // Repeat
  for (int i=0; i<dataCount; i++) {
    for (int j=0; j<8; j++) irPulse( 425, (data[i]>>j)%2 ? 1275:425 );  // Data
  }
  irPulse( 425, 0 );  // Trailer
}

void sendIrNEC() {
  // T=562us
  const int dataCount = sizeof data /sizeof data[0];
  irPulse( 9000, 4500 );        // Leader
  for (int i=0; i<dataCount; i++) {
    for(int j=0; j<8; j++) irPulse( 562, (data[i]>>j)%2 ? 1687:562 );  // Data
  }
  irPulse( 562, 40000 );        // Trailer
}

void irPulse( unsigned long lenH, unsigned long lenL ) {
    unsigned long irExp = micros() + lenH;
    while ( irExp > micros() ) {  // Output pulse for lenH usec
      digitalWrite( IR_LED, HIGH );  delayMicroseconds(5);
      digitalWrite( IR_LED, LOW  );  delayMicroseconds(9);
    }
    
    if (lenL > 16000 ){  // To avoid Arduino's delayMicroseconds limitation
      delay(lenL / 1000);
    } else {
      delayMicroseconds( lenL );  // for LenL usec
    }
}

てへぺろ