Enhance user experiences with advanced ERM motor control based on C1026B002F and STM32F031K6
Sync and thrive!
Published Oct 01, 2024
Click board™
Vibro Motor Click
Dev Board
Nucleo 32 with STM32F031K6 MCU
Compiler
NECTO Studio
MCU
STM32F031K6
In today's dynamic landscape of vibrational applications, our solution aims to simplify motor control and enhance vibrational experiences, offering a user-friendly way to manage ERM motors
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Hardware Overview
How does it work?
Vibro Motor Click is based on the C1026B002F, a compact-size Eccentric Rotating Mass (ERM) motor. This type of motor is often used for haptic feedback on many small handheld devices, such as cellphones, pagers, RFID scanners, and similar devices. This motor contains a small eccentric weight on its rotor, so it also produces a vibration effect while rotating. This kind of motor is sometimes called a coin motor due to its shape. Besides the vibration motor, the click is also equipped with the DMG3420U, a small MOSFET used to drive the motor. The Vibro Motor click is ideal for adding simple, one-pin-driven haptic feedback on any design. The circuit also contains
a protection diode, which protects the transistor from the reverse voltage since the motor represents an inductive load, and turning off its current can produce a kickback voltage that can damage the transistor. The gate of the MOSFET is driven by the PWM signal, routed through the PWM pin of the mikroBUS™. The PWM signal toggles the gate of the MOSFET with pulses of a certain width. As a result, the current through the motor is varied depending on the pulse width of the PWM signal, which directly affects the speed of the motor, effectively controlling the vibration force that way. The small, eccentric weight attached to the rotor of the coin motor generates
the centrifugal force while it rotates, which in turn results in the wobbling effect of the motor itself. The faster the rotation is, the bigger the force gets. Controlling the motor speed allows for the vibration intensity to be controlled. This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing 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.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M0
MCU Memory (KB)
32
Silicon Vendor
STMicroelectronics
Pin count
32
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
Take a closer look
Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Nucleo 32 with STM32F031K6 MCU as your development board.
Track your results in real time
Application Output via Debug Mode
1. Once the code example is loaded, pressing the "DEBUG" button initiates the build process, programs it on the created setup, and enters Debug mode.
2. After the programming is completed, a header with buttons for various actions within the IDE becomes visible. Clicking the green "PLAY" button starts reading the results achieved with the Click board™. The achieved results are displayed in the Application Output tab.
Software Support
Library Description
This library contains API for Vibro Motor Click driver.
Key functions:
vibromotor_set_duty_cycle- This function sets the PWM duty cycle in percentages ( Range[ 0..1 ] )vibromotor_pwm_stop- This function stops the PWM moudle outputvibromotor_pwm_start- This function starts the PWM moudle output.
Open Source
Code example
This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.
/*!
* @file main.c
* @brief VibroMotor Click example
*
* # Description
* This application contorl the speed of vibro motor.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes GPIO driver and PWM.
* Configures PWM to 5kHz frequency, calculates maximum duty ratio and starts PWM
* with duty ratio value 0.
*
* ## Application Task
* Allows user to enter desired command to control
* Vibro Motor Click board.
*
* @author Stefan Ilic
*
*/
#include "board.h"
#include "log.h"
#include "vibromotor.h"
static vibromotor_t vibromotor;
static log_t logger;
void application_init ( void ) {
log_cfg_t log_cfg; /**< Logger config object. */
vibromotor_cfg_t vibromotor_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.
vibromotor_cfg_setup( &vibromotor_cfg );
VIBROMOTOR_MAP_MIKROBUS( vibromotor_cfg, MIKROBUS_1 );
err_t init_flag = vibromotor_init( &vibromotor, &vibromotor_cfg );
if ( PWM_ERROR == init_flag ) {
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
vibromotor_set_duty_cycle ( &vibromotor, 0.0 );
vibromotor_pwm_start( &vibromotor );
log_info( &logger, " Application Task " );
}
void application_task ( void ) {
static int8_t duty_cnt = 1;
static int8_t duty_inc = 1;
float duty = duty_cnt / 10.0;
vibromotor_set_duty_cycle ( &vibromotor, duty );
log_printf( &logger, "> Duty: %d%%\r\n", ( uint16_t )( duty_cnt * 10 ) );
Delay_ms( 500 );
if ( 10 == duty_cnt ) {
duty_inc = -1;
} else if ( 0 == duty_cnt ) {
duty_inc = 1;
}
duty_cnt += duty_inc;
}
void main ( void ) {
application_init( );
for ( ; ; ) {
application_task( );
}
}
// ------------------------------------------------------------------------ END
