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Button::Button( int pin )
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_last_real_state( false ),
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_millis_real_state( 0 )
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void Button::set_event_times( int event_times[] )
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_event_times = event_times;
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_state( digitalRead( pin )? false : true ),
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_state_millis( ::millis() ),
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void Button::add_event_at( int duration, int event_id )
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_press_events[ duration ] = event_id;
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unsigned long millis = ::millis();
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bool real_state = digitalRead( _pin )? false : true;
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// if real state has changed, reset the timer
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if( real_state != _last_real_state ) {
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_last_real_state = real_state;
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_millis_real_state = millis;
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// get state and check for change
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bool state = digitalRead( _pin )? false : true;
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_state_millis = millis;
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// work out current state; if the real state timer has elapsed, set our
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// state to real state
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if( _last_real_state != state && millis - _millis_real_state > 15 )
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state = _last_real_state;
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// if the button is pressed
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// if button has been pressed for any amount of time
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if( state && _state_millis < millis )
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// if it has just been pressed, record the time now and reset how much
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// of the press we have already generated events for
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_millis_state = millis;
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// calculate time that has elapsed in total this press
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unsigned long elapsed = millis - _millis_state;
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// look through the events to see if any need to be triggered
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for( int a = 0; _event_times[ a ]; a++ )
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// calculate new duration for this state
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unsigned long duration = millis - _state_millis;
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// check through events to see if the button has been
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// pressed long enough to trigger one
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for( std::map< int, int >::iterator i = _press_events.begin();
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i != _press_events.end(); i++ )
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// if this event is in the future, stop
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if( (unsigned)_event_times[ a ] > elapsed ) break;
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// if this event has already been triggered, skip
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if( (unsigned)_event_times[ a ] <= _millis_done ) continue;
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_pending_event = a + 1;
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// if this event is in the future, we can stop looking
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if( duration < (unsigned long)i->first )
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// if this event happened since the previous update, we
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if( _state_duration < (unsigned long)i->first )
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_event_id = i->second;
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// update the amount of press we have processed
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_millis_done = elapsed;
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// update the duration we've accounted for
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_state_duration = duration;
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int Button::get_event()
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int event = _pending_event;
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bool Button::get_state()
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int Button::get_triggered_event()