void digi2() {
  Serial.println("digi 2, button 2");
}

void digi3() {
  Serial.println("digi 3, button 1");
}

void digi4() {
  Serial.println("digi 4, button V");
}

void digi5() {
  Serial.println("digi 5, button U");
}

void digi6() {
  Serial.println("digi 6, button D");
}

void digi7() {
  Serial.println("digi 9, button L");
}

void digi8() {
  Serial.println("digi 10, button 4");
}

void digi9() {
  Serial.println("digi 11, button 3");
}

void setup() {
  Serial.begin(115200);

  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
  pinMode(6, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
  pinMode(10, INPUT_PULLUP);
  pinMode(11, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(2), digi2, RISING);
  attachInterrupt(digitalPinToInterrupt(3), digi3, RISING);
  attachInterrupt(digitalPinToInterrupt(4), digi4, RISING);
  attachInterrupt(digitalPinToInterrupt(5), digi5, RISING);
  attachInterrupt(digitalPinToInterrupt(6), digi6, RISING);
  attachInterrupt(digitalPinToInterrupt(9), digi7, RISING);
  attachInterrupt(digitalPinToInterrupt(10), digi8, RISING);
  attachInterrupt(digitalPinToInterrupt(11), digi9, RISING);
}

void loop() {

}