arduino_button_reading.cpp

#include "Arduino.h"

#define BUTTON_GPIO 33
#define DEBOUNCE_DELAY 100

unsigned long lastDebounceTime = 0;
bool buttonState = HIGH;

void setup() {
  pinMode(BUTTON_GPIO, INPUT_PULLUP);
  Serial.begin(115200);
}

int count = 0;

void loop() {
  int reading = digitalRead(BUTTON_GPIO);
  
  if (!reading) {
    if (buttonState == HIGH && ((millis() - lastDebounceTime) > DEBOUNCE_DELAY)) {
      buttonState = LOW;
      lastDebounceTime = millis();
      count += 1;
      Serial.printf("click %d\n", count);
    }
  } else {
    buttonState = HIGH;
  }
}