Arduino Code

#include <Metro.h>

int button = 2;
int led = 13;
int points = 0;
int pointState = 3;

boolean ledState = LOW;

Metro ledButton = Metro(0);

void setup()
{
  Serial.begin(9600);
  pinMode (led, OUTPUT);
  pinMode (button, INPUT);
}

void loop()
{
  boolean buttonState = digitalRead(button);

  if (ledButton.check() == 1)
  {
      if (ledState == LOW)
      {
        ledState = HIGH;

        if (pointState == HIGH){
          points++;
          pointState = 3;
      }
      ledButton.interval(500);
    }

    else
    {
      ledState = LOW;

      if (pointState == LOW){
        points--;
        pointState = 3;
      }
      Serial.println(points);
    }
  }

  if (buttonState == HIGH && ledState == HIGH)
    pointState = HIGH;

  if (buttonState == HIGH && ledState == LOW)
    pointState = LOW;

  digitalWrite (led,ledState);
}