int buttonPushCounter = 0;
int buttonState = 0; 
int lastButtonState = 0;

void setup() {
  pinMode(5, INPUT);
  pinMode(13, OUTPUT);
  
  Serial.begin(9600);
}


void loop() {
  buttonState = digitalRead(5);

  if (buttonState != lastButtonState) {
    if (buttonState == HIGH) {
      digitalWrite(13, HIGH);
      Serial.println("H");
    } else {
      digitalWrite(13, LOW);
      Serial.println("L");
    }
    
    delay(50);
  }
  
  lastButtonState = buttonState;
}