// Adding a callback function example.
// In this example we'll setup and demo a callback. As well as read the button state in
// loop(). You don't need the button state stuff in loop() to make the callback stuff
// work. Its just there to show you two things going at once.

#include <mechButton.h>

#define BTN_PIN	2     // Pin we'll hook the button to. The other side hooks to ground.
#define LED_PIN	13    // Usual pin number for built in LED.

mechButton aButton(BTN_PIN);  // Set button one to pin BTN_PIN.

// Your standard sketch setup()
void setup() {
   Serial.begin(9600);						// Fire up our serial monitor thing.
   pinMode(LED_PIN,OUTPUT);				// Set up the LED pin for output.
   aButton.setCallback(myCallback);		// Set up our callback. 

// This is the guy that's called when the button changes state.
void myCallback(void) {

   Serial.print("Button just became ");
   if (aButton.trueFalse()) {
   } else {

// Your standard sketch loop()
void loop() {
   bool	buttonState;
   idle();											// Let all the idlers have time to do their thing.
   buttonState = aButton.trueFalse();		// Have a look at what the current button state is.
   digitalWrite(LED_PIN,!buttonState);		// Since the button grounds when pushed, invert logic with !