byte switchPin = 2;                       // Switch connected to pin 2
byte sendByte[] = {0x55, 0x56, 0x00, 0x00, 0x00, 0x03, 0x01, 0xAF};
//-------------------------------------------------------------------
void setup() {
  pinMode(switchPin, INPUT_PULLUP);      // Set pin 2 as an input
  Serial1.begin(9600);                    // Start serial communication at 9600 bps
  Serial.begin(115200);
}
//-------------------------------------------------------------------
void loop() {
  if (digitalRead(switchPin) == LOW) {  // If switch is ON,
    delay(30);
    if (digitalRead(switchPin) == LOW) {
      for (int i = 0; i < 8; i++)
      {
        Serial1.print(sendByte[i], HEX);                    // send 1 to Serial (Processing)
        Serial.print(sendByte[i], HEX);
      }
    }
    while (digitalRead(switchPin) == LOW) {}
    Serial.println(" ");
  }
}