Add interactive sound elements to various projects using STM32F031K6 and CMT-8540S-SMT

Blasting through noise: The resonant power of modern buzzers

BUZZ 2 Click with Nucleo 32 with STM32F031K6 MCU

Published Oct 01, 2024

Click board™

BUZZ 2 Click

Dev. board

Nucleo 32 with STM32F031K6 MCU

Compiler

NECTO Studio

MCU

STM32F031K6

Discover how our buzzer solution can revolutionize your daily life, from enhancing home security to streamlining industrial processes

Hardware Overview

How does it work?

BUZZ 2 Click is based on the CMT-8540S-SMT, a magnetic buzzer transducer from CUI Devices. The buzzer's resonant frequency is 4kHz. The click is designed to run on either a 3.3V or 5V power supply. The PWM pin on the mikroBUS™ line controls the CMT-8540S-SMT magnetic buzzer. You can create different sound patterns using

the Sound library supported in our compilers or utilize the microcontroller's internal PWM module to create the signal for the buzzer. Signal frequency determines the sound pitch, and the duty cycle determines the amplitude (sound volume). This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the

VCCIO SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.

Features overview

Development board

Nucleo 32 with STM32F031K6 MCU board provides an affordable and flexible platform for experimenting with STM32 microcontrollers in 32-pin packages. Featuring Arduino™ Nano connectivity, it allows easy expansion with specialized shields, while being mbed-enabled for seamless integration with online resources. The

board includes an on-board ST-LINK/V2-1 debugger/programmer, supporting USB reenumeration with three interfaces: Virtual Com port, mass storage, and debug port. It offers a flexible power supply through either USB VBUS or an external source. Additionally, it includes three LEDs (LD1 for USB communication, LD2 for power,

and LD3 as a user LED) and a reset push button. The STM32 Nucleo-32 board is supported by various Integrated Development Environments (IDEs) such as IAR™, Keil®, and GCC-based IDEs like AC6 SW4STM32, making it a versatile tool for developers.

Nucleo 32 with STM32F031K6 MCU double side image

Microcontroller Overview

MCU Card / MCU

Architecture

ARM Cortex-M0

MCU Memory (KB)

Silicon Vendor

STMicroelectronics

Pin count

RAM (Bytes)

4096

You complete me!

Accessories

Click Shield for Nucleo-32 is the perfect way to expand your development board's functionalities with STM32 Nucleo-32 pinout. The Click Shield for Nucleo-32 provides two mikroBUS™ sockets to add any functionality from our ever-growing range of Click boards™. We are fully stocked with everything, from sensors and WiFi transceivers to motor control and audio amplifiers. The Click Shield for Nucleo-32 is compatible with the STM32 Nucleo-32 board, providing an affordable and flexible way for users to try out new ideas and quickly create prototypes with any STM32 microcontrollers, choosing from the various combinations of performance, power consumption, and features. The STM32 Nucleo-32 boards do not require any separate probe as they integrate the ST-LINK/V2-1 debugger/programmer and come with the STM32 comprehensive software HAL library and various packaged software examples. This development platform provides users with an effortless and common way to combine the STM32 Nucleo-32 footprint compatible board with their favorite Click boards™ in their upcoming projects.

Used MCU Pins

mikroBUS™ mapper

RST

SCK

MISO

MOSI

Power Supply

3.3V

Ground

GND

PWM Buzzer Control

PA8

PWM

INT

SCL

SDA

Power Supply

Ground

GND

Take a closer look

Click board™ Schematic

Step by step

Project assembly

Click Shield for Nucleo-144 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Nucleo 32 with STM32F031K6 MCU as your development board.

Nucleo 144 with STM32L4A6ZG MCU front image hardware assembly

Stepper 22 Click front image hardware assembly

Board mapper by product8 hardware assembly

STM32 M4 Clicker HA MCU/Select Step hardware assembly

Necto No Display image step 8 hardware assembly

Debug Image Necto Step hardware assembly

Software Support

Library Description

This library contains API for BUZZ 2 Click driver.

Key functions:

buzz2_set_duty_cycle - BUZZ 2 sets PWM duty cycle
buzz2_play_sound - Play sound function
buzz2_pwm_start - BUZZ 2 start PWM module

Open Source

Code example

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

/*!
 * @file main.c
 * @brief Buzz2 Click example
 *
 * # Description
 * This example demonstrates the use of Buzz 2 Click boards.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initializes the driver and logger.
 *
 * ## Application Task
 * Plays the Imperial March melody. Also logs an appropriate message on the USB UART.
 *
 * @note
 * The minimal PWM Clock frequency required for this example is the frequency of tone C6 - 1047 Hz. 
 * So, in order to run this example and play all tones correctly, the user will need to decrease 
 * the MCU's main clock frequency in MCU Settings for the certain architectures
 * in order to get the required PWM clock frequency.
 * 
 * @author Jelena Milosavljevic
 *
 */

#include "board.h"
#include "log.h"
#include "buzz2.h"

#define W 4*Q // Whole 4/4 - 4 Beats
#define H 2*Q // Half 2/4 - 2 Beats 
#define Q 250 // Quarter 1/4 - 1 Beat
#define E Q/2 // Eighth 1/8 - 1/2 Beat
#define S Q/4 // Sixteenth 1/16 - 1/4 Beat

#define VOLUME 100 // goes up to 1000

static buzz2_t buzz2;
static log_t logger;

static void imperial_march( ) 
{
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_F6, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_C7, VOLUME, S );
    Delay_ms ( 1 + S );
    
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_F6, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_C7, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, H );
    Delay_ms ( 1 + H );
    
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_E7, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_E7, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_E7, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_F7, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_C7, VOLUME, S );
    Delay_ms ( 1 + S );
    
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Ab6, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_F6, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_C7, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, H );
    Delay_ms ( 1 + H );
    
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A7, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A7, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Ab7, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_G7, VOLUME, S );
    Delay_ms ( 1 + S );
    
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Gb7, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_E7, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_F7, VOLUME, E );
    Delay_ms ( 1 + E );
    Delay_ms ( 1 + E );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Bb6, VOLUME, E );
    Delay_ms ( 1 + E );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Eb7, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_D7, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Db7, VOLUME, S );
    Delay_ms ( 1 + S );
    
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_C7, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_B6, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_C7, VOLUME, E );
    Delay_ms ( 1 + E );
    Delay_ms ( 1 + E );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_F6, VOLUME, E );
    Delay_ms ( 1 + E );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Ab6, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_F6, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, S );
    Delay_ms ( 1 + S );
    
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_C7, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_C7, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_E7, VOLUME, H );
    Delay_ms ( 1 + H );
    
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A7, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A7, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Ab7, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_G7, VOLUME, S );
    Delay_ms ( 1 + S );
    
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Gb7, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_E7, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_F7, VOLUME, E );
    Delay_ms ( 1 + E );
    Delay_ms ( 1 + E );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Bb6, VOLUME, E );
    Delay_ms ( 1 + E );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Eb7, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_D7, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Db7, VOLUME, S );
    Delay_ms ( 1 + S );
    
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_C7, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_B6, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_C7, VOLUME, E );
    Delay_ms ( 1 + E );
    Delay_ms ( 1 + E );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_F6, VOLUME, E );
    Delay_ms ( 1 + E );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Ab6, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_F6, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_C7, VOLUME, S );
    Delay_ms ( 1 + S );
    
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_A6, VOLUME, Q );
    Delay_ms ( 1 + Q );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_F6, VOLUME, E + S );
    Delay_ms ( 1 + E + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_C7, VOLUME, S );
    Delay_ms ( 1 + S );
    buzz2_play_sound(&buzz2, BUZZ2_NOTE_Ab6, VOLUME, H );
    Delay_ms ( 1 + H );
}

void application_init ( void ) {
    log_cfg_t log_cfg;  /**< Logger config object. */
    buzz2_cfg_t buzz2_cfg;  /**< Click config object. */

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );

    // Click initialization.

    buzz2_cfg_setup( &buzz2_cfg );
    BUZZ2_MAP_MIKROBUS( buzz2_cfg, MIKROBUS_1 );
    err_t init_flag  = buzz2_init( &buzz2, &buzz2_cfg );
    if ( init_flag == PWM_ERROR ) {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    buzz2_set_duty_cycle ( &buzz2, 0.0 );
    buzz2_pwm_start( &buzz2 );
    Delay_ms ( 100 );

    log_info( &logger, " Application Task " );
}

void application_task ( void )
{
    log_printf( &logger, "Playing the Imperial March melody ...\r\n" );
    imperial_march( ); 
    // 10 seconds delay
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}

// ------------------------------------------------------------------------ END