ESP32 KY-012 Active Buzzer Module

🛠️ KY-012 Active Buzzer Module Troubleshooting

This guide outlines a systematic approach to troubleshoot and resolve common problems with the . Start by confirming that the hardware connections are correct, as wiring mistakes are the most frequent cause of issues. If you are sure the connections are correct, follow the below steps to debug common issues.

❌ No Sound Emitted

🔊 Continuous Sound

💻 Code Examples

Below you can find code examples of KY-012 Active Buzzer Module with ESP32 in several frameworks:

• Arduino IDE
• ESP-IDF
• ESPHome
• PlatformIO
• MicroPython

If you encounter issues while using the KY-012 Active Buzzer Module, check the Common Issues Troubleshooting Guide.

ESP32 KY-012 Arduino IDE Code Example

Example in Arduino IDE

Fill in your main Arduino IDE sketch file with the following code to use the KY-012 Active Buzzer Module:

int buzzer = 13;

void setup() {
    pinMode(buzzer, OUTPUT); // Initialize the buzzer pin as an output
}

void loop() {
    digitalWrite(buzzer, HIGH); // Turn the buzzer on
    delay(4000); // Wait for 4 seconds
    digitalWrite(buzzer, LOW); // Turn the buzzer off
    delay(2000); // Wait for 2 seconds
}

This Arduino code alternates the KY-012 buzzer on and off. The buzzer is connected to pin 13, which is set as an output. The buzzer is turned on for 4 seconds and then off for 2 seconds in a continuous loop.

Connect your ESP32 to your computer via a USB cable, Ensure the correct Board and Port are selected under Tools, Click the "Upload" button in the Arduino IDE to compile and upload the code to your ESP32.

ESP32 KY-012 ESP-IDF Code Example

Example in Espressif IoT Framework (ESP-IDF)

If you're using ESP-IDF to work with the KY-012 Active Buzzer Module, here's how you can set it up and read data from the sensor. Fill in this code in the main ESP-IDF file:

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"

#define BUZZER_PIN GPIO_NUM_15

void app_main(void) {
    gpio_config_t io_conf = {
        .pin_bit_mask = (1ULL << BUZZER_PIN),
        .mode = GPIO_MODE_OUTPUT,
        .pull_up_en = GPIO_PULLUP_DISABLE,
        .pull_down_en = GPIO_PULLDOWN_DISABLE,
        .intr_type = GPIO_INTR_DISABLE
    };
    gpio_config(&io_conf);

    while (1) {
        gpio_set_level(BUZZER_PIN, 1); // Turn the buzzer on
        vTaskDelay(pdMS_TO_TICKS(4000)); // Wait for 4 seconds
        gpio_set_level(BUZZER_PIN, 0); // Turn the buzzer off
        vTaskDelay(pdMS_TO_TICKS(2000)); // Wait for 2 seconds
    }
}

This ESP-IDF code configures GPIO15 as an output to control the KY-012 active buzzer. The buzzer is turned on for 4 seconds and then off for 2 seconds in a loop.

Update the I2C pins (I2C_MASTER_SDA_IO and I2C_MASTER_SCL_IO) to match your ESP32 hardware setup, Use idf.py build to compile the project, Use idf.py flash to upload the code to your ESP32.

ESP32 KY-012 ESPHome Code Example

Example in ESPHome (Home Assistant)

Fill in this configuration in your ESPHome YAML configuration file (example.yml) to integrate the KY-012 Active Buzzer Module

output:
  - platform: gpio
    pin: GPIO15
    id: buzzer_output

switch:
  - platform: output
    name: "KY-012 Buzzer"
    output: buzzer_output
    turn_on_action:
      - output.turn_on: buzzer_output
      - delay: 4s
      - output.turn_off: buzzer_output
    turn_off_action:
      - output.turn_off: buzzer_output

This ESPHome configuration sets up the KY-012 active buzzer on GPIO15 using a simple GPIO switch. The buzzer can be toggled on and off through the ESPHome interface.

Upload this code to your ESP32 using the ESPHome dashboard or the esphome run command.

ESP32 KY-012 PlatformIO Code Example

Example in PlatformIO Framework

For PlatformIO, make sure to configure the platformio.ini file with the appropriate environment and libraries, and then proceed with the code.

Configure platformio.ini

First, your platformio.ini should look like below. You might need to include some libraries as shown. Make sure to change the board to your ESP32:

[env:esp32]
platform = espressif32
board = esp32dev
framework = arduino

ESP32 KY-012 PlatformIO Example Code

Write this code in your PlatformIO project under the src/main.cpp file to use the KY-012 Active Buzzer Module:

#include <Arduino.h>

#define BUZZER_PIN 15

void setup() {
    pinMode(BUZZER_PIN, OUTPUT);
}

void loop() {
    digitalWrite(BUZZER_PIN, HIGH); // Turn buzzer on
    delay(4000);
    digitalWrite(BUZZER_PIN, LOW); // Turn buzzer off
    delay(2000);
}

This PlatformIO code configures GPIO15 as an output to control the KY-012 active buzzer. The buzzer is turned on for 4 seconds and off for 2 seconds in an alternating cycle.

Upload the code to your ESP32 using the PlatformIO "Upload" button in your IDE or the pio run --target upload command.

ESP32 KY-012 MicroPython Code Example

Example in Micro Python Framework

Fill in this script in your MicroPython main.py file (main.py) to integrate the KY-012 Active Buzzer Module with your ESP32.

import machine
import time

BUZZER_PIN = machine.Pin(15, machine.Pin.OUT)

while True:
    BUZZER_PIN.value(1)  # Turn buzzer on
    time.sleep(4)        # Wait for 4 seconds
    BUZZER_PIN.value(0)  # Turn buzzer off
    time.sleep(2)        # Wait for 2 seconds

This MicroPython script configures GPIO15 as an output for the KY-012 active buzzer. It alternates the buzzer on and off in a cycle of 4 seconds on and 2 seconds off.

Upload this code to your ESP32 using a MicroPython-compatible IDE, such as Thonny, uPyCraft, or tools like ampy.