text: // LED Display for TEST & Debug
  // Mar.12.2020 by H.Saeki
  //
  
  const int LED_B 20;
  const int LED_Y 21;
  const int LED_G 22;
  const int LED_R 23;
  
  // the setup function runs once when you press reset or power the board
  void LED_Init() {
    // initialize digital pin LED_BUILTIN as an output.
    pinMode(LED_B, OUTPUT);
    pinMode(LED_G, OUTPUT);
    pinMode(LED_Y, OUTPUT);
    pinMode(LED_R, OUTPUT);
  }
  