Option for Buzzer

[electric-m]

Hey there,

I was wondering if it would be possible to add code for using a buzzer at the ESP32.
Something like defining pins, make them configurable in config.h

When a tag is presented, the buzzer should output something like „beep beep“.

michael

[electric-m]

Maybe something like this?
Of course the action of pressing g a button would have to be exchanged for the trigger of the NFC chip.

void loop() {
    // Read the state of the button value:
    buttonState = digitalRead(buttonPin);
    // Check if the button is pressed.
    // If it is, the buttonState is LOW (because of INPUT_PULLUP) :
    if (buttonState == LOW) E
    // Buzz the butzer 5 times
    for (int i = 0; i < 5; i++) {
      digitalwrite(buzzerPin, HIGH); - //- Turn the Buzzer on delay (300);
      // wait for half a second
      digitalWrite(buzzerPin, LOW);
      // Turn the Buzzer off
      delay(300);
      // Wait for half a second
      ｝
      // Wait for the button to be released
      while (digitalRead(buttonPin) == LOW) {
        delay(30);
        // Little delay for debounce
      }
    }

[rednblkx]

Thanks for the suggestion!
I do see that i would make sense to have some external feedback, I'll see what i can do, i can definitely add an option to the config.h file so it's an opt in for people.

[5and0]

This is my remedial addition which I added...

// Function to activate the buzzer for a short time void activateBuzzer() { // Configure the GPIO pin for output printf("Activating buzzer...\n"); gpio_pad_select_gpio(BUZZER_PIN); gpio_set_direction(BUZZER_PIN, GPIO_MODE_OUTPUT); // Turn on the buzzer gpio_set_level(BUZZER_PIN, 1); // Delay for 100 milliseconds vTaskDelay(pdMS_TO_TICKS(250)); // Turn off the buzzer gpio_set_level(BUZZER_PIN, 0); }

I only activate when an NFC tag is scanned as iPhone/Apple Watch provide confirmation....

else { json payload; payload["atqa"] = utils::bufToHexString(atqa, 1, true); payload["sak"] = utils::bufToHexString(sak, 1, true); payload["uid"] = utils::bufToHexString(uid, uidLen, true); payload["homekey"] = false; mqtt.publish(MQTT_AUTH_TOPIC, payload.dump().c_str()); activateBuzzer(); // Activate the buzzer }

I was also thinking it would be good to provide some confirmation of authentication when the tag is accepted/denied. It would be good to have an LED to flash green or red.

[electric-m]

I think that’s a good idea, to only activate the buzzer for nfc tags.
Does your buzzer beep only once?

I thought about letting it beep quickly two times when a tag is recognized, because that’s a common sound pattern for „everything is alright, no error“.

[angelosan]

Hi,
i am very interested in this solution, please could i have the places where to insert the proposed code.

I added in config.h

#define BUZZER_PIN 12

i added in main.cpp

// Function to activate the buzzer for a short period of time
void activateBuzzer()
{
// Configures the GPIO pin for the output
printf(“Buzzer activation...\n”);
gpio_pad_select_gpio(BUZZER_PIN);
gpio_set_direction(BUZZER_PIN, GPIO_MODE_OUTPUT);
// Turn on the buzzer
gpio_set_level(BUZZER_PIN, 1);
// Delay of 100 milliseconds
vTaskDelay(pdMS_TO_TICKS(250));
// Turn off the buzzer
gpio_set_level(BUZZER_PIN, 0);
}

during compilation I get this error

argument of type “int” is incompatible with parameter of type “gpio_num_t ”C/C++(167)
#define BUZZER_PIN 12

I am missing to figure out where to insert

else { json payload; payload[“atqa”] = utils::bufToHexString(atqa, 1, true); 
    payload[“sak”] = utils::bufToHexString(sak, 1, true); 
    payload[“uid”] = utils::bufToHexString(uid, uidLen, true); payload[“homekey”] = false; 
    mqtt.publish(MQTT_AUTH_TOPIC, payload.dump().c_str()); 
    activateBuzzer(); 
    // Activates the buzzer
   }

Thank you and sorry for my English

Translated with DeepL.com (free version)