Button Library

This is a simple button library for embedded systems. It provides an easy way to handle button presses and releases.

Features

• Debouncing
• Short and long press detection
• Multiple button support

Installation

To use this library, include the button.h file in your project.

Usage

Connect the switch between an appropriate MCU pin and ground. An internal pull-up resistor will be used.

#include "button.h"

setup() {
    Button btn = Button(2);         // Use PIN 2
    btn.setShiftRegisterSize(12);   // optional
    btn.setMinPressDuration(10);    // optional
}

loop() {
    uint8_t btn_state = btn.read();
    switch(btn_state) {
        case STATE_SHORTPRESS:
            // there was a short press
            break;
        case STATE_LONGPRESS:
            // there was a long press
            break;
    }
}

API

void Button::setShiftRegisterSize(uint8_t size)

Sets the size of the shift register used for debouncing.

• Parameters:
  • size: The size of the shift register.

void Button::setMinPressDuration(uint16_t d)

Sets the minimum duration for a press to be considered valid. Setting this to zero effectively disables checks for short presses.

• Parameters:
  • d: The minimum press duration in milliseconds.

void Button::setLongPressDuration(uint16_t d)

Sets the minimum press duration of a long press.

• Parameters:
  • d: The long press duration in milliseconds.

uint8_t Button::read()

Reads the current state of the button.

• Returns:
  • The current state of the button, which can be STATE_SHORTPRESS, STATE_LONGPRESS, STATE_NOPRESS.

uint16_t Button::lastduration()

Gets the duration (ms) of the last press.

• Returns:
  • The duration (ms) of the last press.

License

This project is licensed under the MIT License. See the LICENSE file for details.