#include <Button.h>

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

void handleButtonReleaseEvents(Button &
btn)
{
  Serial.println("release");
  digitalWrite(WLED,LOW);
}
void setup()
{
  Serial.begin(9800);
  pinMode(WLED,OUTPUT);

  button.releaseHandler(handleButtonReleaseEvents);
}

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
   */
}