#include <Button.h>

/*
  Wire like this:
 GND -----/ button ------ pin 12
 */
Button button = Button(12,BUTTON_PULLUP_INTERNAL);

void handleButtonHoldEvents(Button &btn) 
{
  Serial.println("hold");
  for (int i=0; i<10; i++)
  {
    digitalWrite(WLED, HIGH);
    delay(20);
    digitalWrite(WLED, LOW);
    delay(20);
  }
  digitalWrite(WLED, HIGH);
}

void setup()
{
  Serial.begin(9800);
  pinMode(WLED,OUTPUT);

  button.holdHandler(handleButtonHoldEvents,1500);
}

void loop()
{
  button.isPressed(); //update internal state
  /*
   Feel free to do your own processing here. 
   The buttons will be handeled 'automagically' by the handler functions
  */
}