SmartButton Library

SmartButton Library is used for handling various button events. It supports button press, release, multiple click and button hold events. Library is implemented in C++ with build-in Arduino port, but it is easy to port to different architecture.

Features

• asynchronous non-blocking API based on events callbacks
• hardware independent high-level architecture
• works well with digital, analogs and other signal input backends
• easy to use with Arduino boards
• unlimited number of buttons
• support multi-click events
• support press and release events
• support hold and long-hold events
• support auto-repeat events during hold and long-hold
• build-in debounce algorithm
• configurable timeouts

Changelog

2020.08.12 - 0.3.0

• [x] hold auto-repeat periodic events added

2020.08.10 - 0.2.0

• [x] optional initialization by object-interface added
• [x] optional initialization by bool-pointer added
• [x] optional context passing added

Example

Single and double click example:

#include <Arduino.h>
#include <SmartButton.h>

constexpr int BUTTON_PIN = 2;
constexpr int LED_PIN = 13;

using namespace smartbutton;

SmartButton button(BUTTON_PIN, SmartButton::InputType::NORMAL_HIGH);

void setup()
{
    pinMode(LED_PIN, OUTPUT);           // Digital output for led
    pinMode(BUTTON_PIN, INPUT_PULLUP);  // Digital input with pull-up resistors (normal high)

    // Initialize and register smart button
    button.begin([] (SmartButton *button, SmartButton::Event event, int clickCounter)
    {
        if (event == SmartButton::Event::CLICK) {   // Click event handler
            if (clickCounter == 1) {
                digitalWrite(LED_PIN, LOW);         // Single click will turn led off
            } else if (clickCounter == 2) {
                digitalWrite(LED_PIN, HIGH);        // Double click will turn led on
            }
        }
    });
}

void loop()
{
    SmartButton::service();   // Asynchronous service routine, should be called periodically
}