// For https://forum.arduino.cc/t/push-button-hold-it-down-but-only-send-message-once/987854/27

const byte normPin = 3;
const byte buttonPin = 2;
const byte ledPin = LED_BUILTIN;

void your_function(){
  static int j = 0;
  Serial.print(j++);
  for(int i = 0;i < 7; i++ ){
    Serial.print(",");
    Serial.print(i);
    digitalWrite(ledPin,!digitalRead(ledPin));
    delay(500);
  }
  Serial.println();
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(ledPin,OUTPUT);
  // https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/
  attachInterrupt(digitalPinToInterrupt(buttonPin), your_function, RISING);
}

void loop() {
  static int lastButtonState;
  int buttonState = digitalRead(normPin);
  if (buttonState != lastButtonState) {
    if (buttonState == HIGH) { // rising edge
      your_function();
    }
    // Delay a little bit to avoid bouncing
    //delay(50);  // already debounced by the time used by other functions
  }
  // save the current state as the last state, for next time through the loop
  lastButtonState = buttonState;
}


// https://www.arduino.cc/reference/en/language/variables/variable-scope-qualifiers/volatile/