#define LOG_SERIAL Serial

char qrCode[] = {0x7b, 0x48, 0x65, 0x6c, 0x6c, 0x6f};

void setup() {
  LOG_SERIAL.begin(9600);
  delay(10);

  LOG_SERIAL.println("Start");
}

void loop() {
  LOG_SERIAL.println(String(qrCode));
  delay(20000);
}