ESP32 buttons and bouncing

Rigged up button to GPIO 21 to explore, button presses, debouncing and interrupts. Following worked.

/*

 * This ESP32 code is created by esp32io.com Worked 7/11/24

 *

 * This ESP32 code is released in the public domain

 *

 * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-button-debounce

 */

#include <ezButton.h>

#define DEBOUNCE_TIME 50 // the debounce time in millisecond, increase this time if it still chatters

ezButton button(21); // create ezButton object that attach to pin GPIO21

void setup() {

  Serial.begin(9600);

  button.setDebounceTime(DEBOUNCE_TIME); // set debounce time to 50 milliseconds

}

void loop() {

  button.loop(); // MUST call the loop() function first

  if (button.isPressed())

    Serial.println("The button is pressed");

  if (button.isReleased())

    Serial.println("The button is released");

}

----------------------------------------------------Next: interrupts-----

#define BUTTON_PIN 21  // The ESP32 pin GPIO21 connected to the button  Worked 7/11/24

volatile bool buttonPressed = false; // use volatile for variable that is accessed from inside and outside ISR

void IRAM_ATTR handleButtonPress();

void setup() {

  Serial.begin(9600);

  // Initialize the GPIO pin as an input

  pinMode(BUTTON_PIN, INPUT_PULLUP);

  // Attach interrupt to the GPIO pin

  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), handleButtonPress, FALLING);

}

void loop() {

  // Main code here

  if (buttonPressed) {

    Serial.println("Button pressed!");

    buttonPressed = false;  // Reset the flag

  }

  // Other code here

}

// Interrupt Service Routine (ISR)

void IRAM_ATTR handleButtonPress() {

  // Serial.println("Button pressed!"); // do NOT use function that takes long time to execute

  buttonPressed = true;

}

------changed below button GPIO pin from 19 to 21. (RTC wants 19)---------

---------mmm how many GPIO pins can I use like this mmm----------

/*

 * This ESP32 code is created by esp32io.com Worked 7/11/24

 *

 * This ESP32 code is released in the public domain

 *

 * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-button-debounce

 */

#include <ezButton.h>

#define DEBOUNCE_TIME 50 // the debounce time in millisecond, increase this time if it still chatters

ezButton button(19); // create ezButton object that attach to pin GPIO21

void setup() {

  Serial.begin(9600);

  button.setDebounceTime(DEBOUNCE_TIME); // set debounce time to 50 milliseconds

}

void loop() {

  button.loop(); // MUST call the loop() function first

  if (button.isPressed())

    Serial.println("The button is pressedd");

  if (button.isReleased())

    Serial.println("The button is released");

}