button.h

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#ifndef BUTTON_H
#define BUTTON_H
 
#include <Arduino.h>
 
namespace modulove {
 
const uint8_t DEBOUNCE_MS = 10;
 
class Button {
   public:
    enum ButtonChange {
        CHANGE_UNCHANGED,
        CHANGE_PRESSED,
        CHANGE_RELEASED,
    };
 
    Button() {}
    ~Button() {}
 
    void Init(uint8_t pin) {
        pinMode(pin, INPUT_PULLUP);
        pin_ = pin;
    }
 
    void Init(uint8_t pin, uint8_t led_pin) {
        pinMode(led_pin, OUTPUT);
        led_pin_ = led_pin; 
#define LED_PIN_DEFINED
        Init(pin);
    }
 
    void Process() {
        old_read_ = read_;
        read_ = digitalRead(pin_);
 
        bool debounced = (millis() - last_press_) > DEBOUNCE_MS;
        bool pressed = read_ == 0 && old_read_ == 1 && debounced;
        bool released = read_ == 1 && old_read_ == 0 && debounced;
        // Update variables for next loop
        last_press_ = (pressed || released) ? millis(): last_press_;
 
        // Determine current clock input state.
        change_ = CHANGE_UNCHANGED;
        if (pressed) {
            change_ = CHANGE_PRESSED;
            on_ = true;
        } else if (released) {
            change_ = CHANGE_RELEASED;
            on_ = false;
        }
        #ifdef LED_PIN_DEFINED
        // Change LED state
        digitalWrite(led_pin_, on_);
        #endif
    }
 
    inline ButtonChange Change() { return change_; }
 
    inline bool On() { return on_; }
 
   private:
    uint8_t pin_;
    uint8_t led_pin_;
    uint8_t read_;
    uint8_t old_read_;
    unsigned long last_press_;
    ButtonChange change_;
    bool on_;
};
 
}  // namespace modulove
 
#endif