Intermediate
30 min

Seize control and dominate the motion of your BLDC with STSPIN233 and STM32G474RE

Experience the future of motor control

STSPIN233 Click with Nucleo 64 with STM32G474RE MCU

Published Jul 22, 2025

Click board™

STSPIN233 Click

Dev. board

Nucleo 64 with STM32G474RE MCU

Compiler

NECTO Studio

MCU

STM32G474RE

Experience enhanced responsiveness and accuracy with our advanced brushless motor control, perfect for robotics, drones, and industrial automation

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Hardware Overview

How does it work?

STSPIN233 Click is based on the STSPIN233, a low voltage 3-phase integrated motor driver from STMicroelectronics. It contains three independent H-Bridges, each controlling one phase of the brushless motor. These integrated H-Bridges are very efficient - with an ON resistance of approximately 400mΩ (HS+LS) across each bridge. These features make STSPIN233 click perfectly suited for the rapid development of various battery-powered stepper motor applications, including toys, printers, mechatronics, drones, robotics-related applications, and more. Besides the brushless driver IC, this Click board™ also has STM32F031K6T6 MCU onboard, which serves as a “brain” of the STSPIN233 Click. It comes with preloaded firmware, which is programmed to take

control of the motor driver. It reads the current motor status and signals from an optional rotary encoder, calculates desired and real motor status values in real time, and makes necessary corrections to the motor driver. The motor can be controlled using RST, INT, and UART pins – RX and TX. That way, a very reliable brushless motor driver is achieved. The RST pin of the STSPIN233 Click is used to set both bridge outputs in the HIGH-Z mod, disconnecting the power supply from the H-Bridges. This pin allows lower average power consumption as no current can flow from the power supply to the motor. This pin is routed to the RST pin of the mikroBUS™. The INT pin has a double purpose: when set to a high logic level, it acts as a chip enable, allowing the device to

operate. In the case of a fault condition on the IC, it will be asserted to a LOW logic level, acting as an interrupt pin. A restart attempt will be made after a timeout period defined by the external capacitor and resistor values. This pin is routed to both INT pins of the mikroBUS™, allowing the host MCU to use both functions. The mentioned pin is labeled as FLT on the Click board™ respectively. The motor power supply can be connected to the input terminal labeled as VIN and should be within the range of 1.8V to 10V. Brushless motor coils can be connected to U, V, and W terminals. The Click board™ requires an external power supply for the motor to work. However, it also requires 3.3V from the mikroBUS™ rail.

STSPIN233 Click hardware overview image

Features overview

Development board

Nucleo-64 with STM32G474R MCU offers a cost-effective and adaptable platform for developers to explore new ideas and prototype their designs. This board harnesses the versatility of the STM32 microcontroller, enabling users to select the optimal balance of performance and power consumption for their projects. It accommodates the STM32 microcontroller in the LQFP64 package and includes essential components such as a user LED, which doubles as an ARDUINO® signal, alongside user and reset push-buttons, and a 32.768kHz crystal oscillator for precise timing operations. Designed with expansion and flexibility in mind, the Nucleo-64 board features an ARDUINO® Uno V3 expansion connector and ST morpho extension pin

headers, granting complete access to the STM32's I/Os for comprehensive project integration. Power supply options are adaptable, supporting ST-LINK USB VBUS or external power sources, ensuring adaptability in various development environments. The board also has an on-board ST-LINK debugger/programmer with USB re-enumeration capability, simplifying the programming and debugging process. Moreover, the board is designed to simplify advanced development with its external SMPS for efficient Vcore logic supply, support for USB Device full speed or USB SNK/UFP full speed, and built-in cryptographic features, enhancing both the power efficiency and security of projects. Additional connectivity is

provided through dedicated connectors for external SMPS experimentation, a USB connector for the ST-LINK, and a MIPI® debug connector, expanding the possibilities for hardware interfacing and experimentation. Developers will find extensive support through comprehensive free software libraries and examples, courtesy of the STM32Cube MCU Package. This, combined with compatibility with a wide array of Integrated Development Environments (IDEs), including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE, ensures a smooth and efficient development experience, allowing users to fully leverage the capabilities of the Nucleo-64 board in their projects.

Nucleo 64 with STM32G474RE MCU double side image

Microcontroller Overview

MCU Card / MCU

STM32G474RE front image

Architecture

ARM Cortex-M4

MCU Memory (KB)

512

Silicon Vendor

STMicroelectronics

Pin count

64

RAM (Bytes)

128k

You complete me!

Accessories

Click Shield for Nucleo-64 comes equipped with two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the STM32 Nucleo-64 board with no effort. This way, Mikroe allows its users to add any functionality from our ever-growing range of Click boards™, such as WiFi, GSM, GPS, Bluetooth, ZigBee, environmental sensors, LEDs, speech recognition, motor control, movement sensors, and many more. More than 1537 Click boards™, which can be stacked and integrated, are at your disposal. The STM32 Nucleo-64 boards are based on the microcontrollers in 64-pin packages, a 32-bit MCU with an ARM Cortex M4 processor operating at 84MHz, 512Kb Flash, and 96KB SRAM, divided into two regions where the top section represents the ST-Link/V2 debugger and programmer while the bottom section of the board is an actual development board. These boards are controlled and powered conveniently through a USB connection to program and efficiently debug the Nucleo-64 board out of the box, with an additional USB cable connected to the USB mini port on the board. Most of the STM32 microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the STM32 Nucleo-64 board with our Click Shield for Nucleo-64, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.

Click Shield for Nucleo-64 accessories 1 image

Brushless DC (BLDC) Motor with a Hall sensor represents a high-performance motor from the 42BLF motor series. This motor, wired in a star configuration, boasts a Hall Effect angle of 120°, ensuring precise and reliable performance. With a compact motor length of 47mm and a lightweight design tipping the scales at just 0.29kg, this BLDC motor is engineered to meet your needs. Operating flawlessly at a voltage rating of 24VDC and a speed range of 4000 ± 10% RPM, this motor offers consistent and dependable power. It excels in a normal operational temperature range from -20 to +50°C, maintaining efficiency with a rated current of 1.9A. Also, this product seamlessly integrates with all Brushless Click boards™ and those that require BLDC motors with Hall sensors.

STSPIN233 Click accessories image

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
Reset
PC12
RST
NC
NC
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
NC
NC
PWM
Fault Interrupt
PC14
INT
UART RX
PA3
TX
UART TX
PA2
RX
NC
NC
SCL
NC
NC
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Click board™ Schematic

STSPIN233 Click Schematic schematic

Step by step

Project assembly

Click Shield for Nucleo-64 accessories 1 image hardware assembly

Start by selecting your development board and Click board™. Begin with the Nucleo 64 with STM32G474RE MCU as your development board.

Click Shield for Nucleo-64 accessories 1 image hardware assembly
Nucleo 64 with STM32G474RE MCU front image hardware assembly
LTE Cat.1 6 Click front image hardware assembly
Prog-cut hardware assembly
LTE Cat.1 6 Click complete accessories setup image hardware assembly
Board mapper by product8 hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
NECTO Compiler Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Clicker 4 for STM32F4 HA MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

Software Support

Library Description

This library contains API for STPSIN233 Click driver.

Key functions:

  • stspin233_send_single_cmd - Send single command

  • stspin233_send_double_cmd - Send double command

  • stspin233_get_int_state - Get INT pin state

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 
 * \brief Stspin233 Click example
 * 
 * # Description
 * This application is motor driver.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Initializes driver and configures the Click board.
 * 
 * ## Application Task  
 * This example demonstrates the use of STSPIN233 Click board, by running the motor clockwise and counter clockwise.
 * All results will be displayed on USB UART.
 * 
 * *note:* 
 * For all other commands that you can use to control your engine, 
 * see the firmware documentation. We used an 8 pole motor for the test.
 * 
 * \author MikroE Team
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "stspin233.h"
#include "string.h"

#define PROCESS_COUNTER 10
#define PROCESS_RX_BUFFER_SIZE 500
#define PROCESS_PARSER_BUFFER_SIZE 500
// ------------------------------------------------------------------ VARIABLES

static stspin233_t stspin233;
static log_t logger;

static char current_parser_buf[ PROCESS_PARSER_BUFFER_SIZE ];

// ------------------------------------------------------- ADDITIONAL FUNCTIONS

static void stspin233_process ( void )
{
    int32_t rsp_size;
    uint16_t rsp_cnt = 0;
    
    char uart_rx_buffer[ PROCESS_RX_BUFFER_SIZE ] = { 0 };
    uint16_t check_buf_cnt; 
    uint8_t process_cnt = PROCESS_COUNTER;
    
    // Clear parser buffer
    memset( current_parser_buf, 0 , PROCESS_PARSER_BUFFER_SIZE ); 
    
    while( process_cnt != 0 )
    {
        rsp_size = stspin233_generic_read( &stspin233, &uart_rx_buffer, PROCESS_RX_BUFFER_SIZE );

        if ( rsp_size > 0 )
        {  
            // Validation of the received data
            for ( check_buf_cnt = 0; check_buf_cnt < rsp_size; check_buf_cnt++ )
            {
                if ( uart_rx_buffer[ check_buf_cnt ] == 0 ) 
                {
                    uart_rx_buffer[ check_buf_cnt ] = 13;
                }
            }
            
            // Storages data in parser buffer
            rsp_cnt += rsp_size;
            if ( rsp_cnt < PROCESS_PARSER_BUFFER_SIZE )
            {
                strncat( current_parser_buf, uart_rx_buffer, rsp_size );
            }
        
            // Clear RX buffer
            memset( uart_rx_buffer, 0, PROCESS_RX_BUFFER_SIZE );
        } 
        else 
        {
            process_cnt--;
            
            // Process delay 
            Delay_100ms( );
        }
    }
}
// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
{
    log_cfg_t log_cfg;
    stspin233_cfg_t cfg;

    /** 
     * 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.

    stspin233_cfg_setup( &cfg );
    STSPIN233_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    stspin233_init( &stspin233, &cfg );

    stspin233_default_cfg( &stspin233 );
}

void application_task ( void )
{
    log_printf( &logger, ">>> START MOTOR\r\n" );
    stspin233_send_single_cmd( &stspin233, STSPIN233_CMD_START_MOTOR );
    stspin233_process( );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    log_printf( &logger, ">>> Set clockwise direction\r\n" );
    stspin233_send_double_cmd( &stspin233, STSPIN233_CMD_DIR_MOTOR, STSPIN233_CW_DIR );
    stspin233_process( );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    log_printf( &logger, ">>> Set counter clockwise direction\r\n" );
    stspin233_send_double_cmd( &stspin233, STSPIN233_CMD_DIR_MOTOR, STSPIN233_CCW_DIR );
    stspin233_process( );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    log_printf( &logger, ">>> STOP MOTOR\r\n" );
    stspin233_send_single_cmd( &stspin233, STSPIN233_CMD_STOP_MOTOR );
    stspin233_process( );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    stspin233_send_single_cmd( &stspin233, STSPIN233_CMD_STATUS );
    stspin233_process( );
    log_printf( &logger, ">>> STATUS: %.5s\r\n", &current_parser_buf[ 9 ] );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    log_printf( &logger, "------------------------------\r\n" );
}

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

Additional Support

Resources

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