Arduino UNO 3でカラーLED、Grove - Chainable RGB LEDで遊ぶ(P9813)

参考

Grove Starter Kit for BeagleBone Green

結果

プログラム

//Chainable_LED_UNO_1
//1個専用のカラーRGB LEDのライブラリ


//送信クロックの発生
void clk() {

  digitalWrite(19, LOW);//clk
  delay(20);                       // wait for a second
  digitalWrite(19, HIGH);//clk
  delay(20);                       // wait for a second

}//clk


//1バイトを送信する
void sendByte(int b) {

  for (int i = 0; i < 8; i++) {
    if ( (b & 0x80) == 0) {
      digitalWrite(18, LOW);//data
    } else {
      digitalWrite(18, HIGH);//data
    }//endif
    clk();
    b = b << 1;
  }//for i

}//sendByte


//1個のLED専用
void setColorRGB(int red, int green, int blue) {

  //開始
  sendByte(0);
  sendByte(0);
  sendByte(0);
  sendByte(0);

  //ここから
  int prefix = 0b11000000;
  if( (blue  & 0x80)==0 ) {prefix = prefix | 0b00100000;}
  if( (blue  & 0x40)==0 ) {prefix = prefix | 0b00010000;}

  if( (green & 0x80)==0 ) {prefix = prefix | 0b00001000;}
  if( (green & 0x40)==0 ) {prefix = prefix | 0b00000100;}

  if( (red   & 0x80)==0 ) {prefix = prefix | 0b00000010;}
  if( (red   & 0x40)==0 ) {prefix = prefix | 0b00000001;}
  sendByte(prefix);

  sendByte(blue);
  sendByte(green);
  sendByte(red);
  //ここまで

  //終了
  sendByte(0);
  sendByte(0);
  sendByte(0);
  sendByte(0);

}//setColorRGB


// the setup function runs once when you press reset or power the board
void setup() {
  //GPIOポートの初期化
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(18, OUTPUT); //data
  pinMode(19, OUTPUT); //clk
}//setup


// the loop function runs over and over again forever
void loop() {

  //赤
  setColorRGB(0x55, 0x00, 0x00);
  delay(500);                       // wait for a second

  //緑
  setColorRGB(0x00, 0x55, 0x00);
  delay(500);                       // wait for a second

  //青
  setColorRGB(0x00, 0x00, 0x55);
  delay(500);                       // wait for a second
  
}//loop