//this program blinks the internal led on a Seeeduino XIAO
//it uses serial communication to send a keypress to the Seeeduino
//the Seeeduino blinks once if the keypress is ´1´ and twice if the keypress is ´2´ etc.

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(9600);
}

void loop() {

  while (Serial.available() == 0) {
  }

  int key = Serial.parseInt();

  if (key >= 1 && key <= 9) {
          
    Serial.print("You pressed: ");       
    Serial.println(key); 
            
    for (int i = 0; i < key; i++) {
      digitalWrite(LED_BUILTIN, HIGH);
      delay(500);
      digitalWrite(LED_BUILTIN, LOW);
      delay(500);
    }
            
    Serial.println("Press a number on your Keyboard");
  }
}