Buzzer Button Sample

This application demonstrates button reading and tone playing functions of the module.

To run the example:

  1. Open the IoT Node Buzzer Button sketch from the examples menu.

  2. Select Turta IoT Node from Tools > Board menu.

  3. Select your device's COM port from Tools > Port menu.

  4. Open Serial Monitor from Tools > Serial Monitor.

  5. Select 115.200 baud from the Serial Monitor's status bar.

  6. Upload the code to your device.

Sample Code

#include <Turta_BuzzerButton_Module.h>
#define LED 13

// Global variables.
bool buttonPressed = false;
bool oldButtonState = false;

// Create Buzzer Button instance.
Turta_BuzzerButton_Module bb;

void setup() {
  // Initialize onboard LED.
  pinMode(LED, OUTPUT);

  // Initialize Buzzer Button.

  // Configure serial port.

void loop() {
  // Read button state.
  buttonPressed = bb.readButton();

  // On button pressed / released.
  if (oldButtonState != buttonPressed) {
    // Set LED state.
    digitalWrite(LED, buttonPressed ? HIGH : LOW);

    // Write button state to the serial monitor.
    Serial.println(buttonPressed ? "Button pressed." : "Button released.");

    // Play tone if button is pressed.
    if (buttonPressed) {
      // Buzzer tone alternative 1:
      // Play 5000Hz tone in 192/255 duty cycle for 100ms.
      bb.buzzerTonePeriod(5000, 192, 100);

    // Play tone if button is released.
    else {
      // Buzzer tone alternative 2:
      // Play 2000Hz tone in 64/255 duty cycle until stopped.
      bb.buzzerTone(2000, 64);
      // Delay 100ms.
      // Stop the buzzer.

  // Store last button state.
  oldButtonState = buttonPressed;

  // Delay 10ms.


After the application is uploaded to the device, it generates different tones when the button is pressed and released. The application also writes the following output to the serial monitor:

Button pressed.
Button released.

The application runs forever until you clear it from memory.

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