Button.h

/*----------------------------------------------------------------------*
 * Arduino Button Library v1.0                                          *
 * Jack Christensen Mar 2012                                            *
 *                                                                      *
 * This work is licensed under the Creative Commons Attribution-        *
 * ShareAlike 3.0 Unported License. To view a copy of this license,     *
 * visit http://creativecommons.org/licenses/by-sa/3.0/ or send a       *
 * letter to Creative Commons, 171 Second Street, Suite 300,            *
 * San Francisco, California, 94105, USA.                               *
 *----------------------------------------------------------------------*/
#ifndef Button_h
#define Button_h
#if ARDUINO >= 100
#include <Arduino.h> 
#else
#include <WProgram.h> 
#endif
class Button
{
    public:
        Button(uint8_t pin, uint8_t puEnable, uint8_t invert, uint32_t dbTime);
        uint8_t read();
        uint8_t isPressed();
        uint8_t isReleased();
        uint8_t wasPressed();
        uint8_t wasReleased();
        uint8_t pressedFor(uint32_t ms);
        uint8_t releasedFor(uint32_t ms);
        uint8_t wasPressedOrReleasedFor(uint32_t ms);
        uint32_t lastChange();
    
    private:
        uint8_t _pin;             //arduino pin number
        uint8_t _puEnable;        //internal pullup resistor enabled
        uint8_t _invert;          //if 0, interpret high state as pressed, else interpret low state as pressed
        uint8_t _state;           //current button state
        uint8_t _lastState;       //previous button state
        uint8_t _changed;         //state changed since last read
        uint32_t _time;           //time of current state (all times are in ms)
        uint32_t _lastChange;     //time of last state change
        uint32_t _changeDuration; //time between the two last state changes
        uint32_t _dbTime;         //debounce time
};
#endif