Button press detector

This implements a version of THE ULTIMATE DEBOUNCER(TM) from hackaday.

It can monitor multiple pins, and sends button events over a queue for your application to process.

Available input GPIO pins

Only the following pins can be used as inputs on the ESP32:

0-19, 21-23, 25-27, 32-39

Example Usage

button_event_t ev;
QueueHandle_t button_events = button_init(BIT64(BUTTON_1) | BIT64(BUTTON_2));
while (true) {
    if (xQueueReceive(button_events, &ev, 1000/portTICK_PERIOD_MS)) {
        if ((ev.pin == BUTTON_1) && (ev.event == BUTTON_DOWN)) {
            // ...
        }
        if ((ev.pin == BUTTON_2) && (ev.event == BUTTON_DOWN)) {
            // ...
        }
    }
}

Event Types

BUTTON_DOWN

Triggered when the button is first considered pressed.

BUTTON_UP

Triggered when the button is considered released. In most cases you can use either the UP or DOWN event for your application, and ignore the other.

BUTTON_HELD

Triggered starting after 2 seconds of long holding a button and then every 50ms thereafter.