Alexa Push button Tutorial: https://help.sinric.pro/pages/tutorials/doorbell

push-button.ino

#if defined(ESP8266)
  #define BUTTON_PIN        D4
#elif defined(ESP32) 
  #define BUTTON_PIN        34
#elif (ARDUINO_ARCH_RP2040)
  #define BUTTON_PIN        7
#endif

int button_state;
int lastbutton_state = LOW;

unsigned long last_debounce_time = 0;
unsigned long debounce_delay = 50; // increase if needed.

void setup() {
  Serial.begin(115200);	
  pinMode(BUTTON_PIN, INPUT);
}

void handle_button_press() {
  int reading = digitalRead(BUTTON_PIN);  
  if (reading != lastbutton_state) {
    last_debounce_time = millis();
  }

  if ((millis() - last_debounce_time) > debounce_delay) {
    if (reading != button_state) {
      button_state = reading;
      
      if (button_state == HIGH) {
        Serial.printf("Pressed!\r\n");
      }
    }
  }
  
  lastbutton_state = reading;
}

void loop() {
  handle_button_press();
}