Code:
   
    uint8_t keyNone[8] = { 0, 0, 0, 0, 0, 0, 0 };    uint8_t keyA[8] = { 0, 0, 4, 0, 0, 0, 0 };


    void setup()
    {
        pinMode(24, INPUT);
        Serial.begin(9600);
        delay(2000);


    }


    void loop()
    {
        if(digitalRead(24) == HIGH) {
        uint8_t ledStatus;


        Serial.write(keyA, 8);


        ledStatus = Serial.read();
        delay(100);


        Serial.write(keyNone, 8);
        }


    }
kannst du mal den Link zu der Seite Posten würde mich interessieren.