Pushbuttons often generate improper open/close transitions when pressed, due to mechanical and physical issues: these transitions may be read as multiple presses in a very short time fooling the program, without debouncing, pressing the button once may cause unpredictable results.
This library keep track of the time passed since the button was pressed to deal with this issue.
Declare a ButtonDebouce object with pinNumber and timeMillis to debounce as parameter, and defined a callback function.
Example:
void onButtonChange(int state) {
Serial.println("Changed: " + String(state));
}
ButtonDebounce button(3, 250); // PIN 3 with 250ms debounce time
button.setCallback(onButtonChange);
Important: buttons don´t share resources. The following methods are avaliable.
update()called inloop method, used to verify the debounce timer and the button state changes.state()return the last button state.setCallback(function)set the callback function that will executed on button state changes.
Due the time buffer used in each button, please call the update() method in loop, so it can be update and reflect all state changes.
Be advised: Do not declare any delay() before the update functions, as it may interfere with the bounce time buffer.
void loop() {
buttonUp.update();
buttonDown.update();
}