Create reliable and accurate step motor driving solution with MTS62C19A and STM32F031K6
Dual full-bridge stepper motor driver with both full and half step control modes
Published Oct 01, 2024
Click board™
Stepper 7 Click
Dev Board
Nucleo 32 with STM32F031K6 MCU
Compiler
NECTO Studio
MCU
STM32F031K6
Capable of driving both windings of a bipolar stepper motor or bidirectionally control two DC motors
A
A
Hardware Overview
How does it work?
Stepper 7 Click is based on the MTS62C19A, a dual full-bridge motor driver from Microchip. This IC's internal structure is symmetrical. It features two MOSFET H-bridges used to drive two coils of a bipolar step motor in both directions. The MTS62C19A uses a wide input voltage range - from 10V to 30V. This is the voltage used to energize the motor coils. A separate voltage level is used for the logic sections of this IC, and it is obtained from the mikroBUS™ +5V rail. The MTS62C19A has two PHASE inputs, which control the direction of current flow through H-bridges and, thus, the motor coils. The output current level is controlled by an internal PWM circuit, which is configured using two logic inputs (Ix0 and Ix1), a current sense resistor, and the voltage on the VREFx input - set to +5V on the Stepper 7 Click. By setting states on the Ix0 and Ix1 pins, the output current through the motor windings can be limited to 0%, 33%, 67%, and 100% of the maximum output current, which is set to about 500mA. This setup allows controlling the
step motor in both full-step and half-step modes by toggling states on the six control pins: PHASE1, PHASE2, I01, I02, I11, and I12. The bipolar step motor coils can be connected to the onboard screw terminals. There are two terminals used to connect each of the step motor coils. The third connector connects an external voltage, ranging from 10V to 30V, depending on the used motor voltage requirements. It should be noted that without a valid external voltage connected to this terminal, the motor will not work. Also, 40V is the absolute maximum voltage allowed as per the datasheet. Thus, the overtemperature protection might be activated when driving heavier loads. The recommended maximum voltage should not exceed 30V, as stated on the silk layer of the PCB. The MTS62C19A control lines are routed to the second IC on the Stepper 7 board, the MCP23S08, a well-known 8-bit I/O expander with a serial interface. It allows the control lines of the MTS62C19A IC to be driven via the SPI and the few pins it uses -
reducing the required pin count of the Stepper 7 click. This also allows for sending compact SPI messages instead of toggling several pins at once - which can introduce problems with timing sometimes, especially when those pins belong to different MCU ports. Changing the supply voltage for the port expander allows different SPI logic levels to be used for the communication - 3.3V or 5V, depending on the host MCU. This can be accomplished by switching the position of the onboard SMD jumper, labeled as PWR SEL. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the PWR 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.
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.
The 28BYJ-48 is an adaptable 5VDC stepper motor with a compact design, ideal for various applications. It features four phases, a speed variation ratio of 1/64, and a stride angle of 5.625°/64 steps, allowing precise control. The motor operates at a frequency of 100Hz and has a DC resistance of 50Ω ±7% at 25°C. It boasts an idle in-traction frequency greater than 600Hz and an idle out-traction frequency exceeding 1000Hz, ensuring reliability in different scenarios. With a self-positioning torque and in-traction torque both exceeding 34.3mN.m at 120Hz, the 28BYJ-48 offers robust performance. Its friction torque ranges from 600 to 1200 gf.cm, while the pull-in torque is 300 gf.cm. This motor makes a reliable and efficient choice for your stepper motor needs.
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ 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
1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.
2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.
3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.
Software Support
Library Description
This library contains API for Stepper 7 Click driver.
Key functions:
stepper7_set_direction- This function sets the motor direction to clockwise or counter-clockwise in ctx->directionstepper7_set_step_mode- This function sets the step mode resolution settings in ctx->step_modestepper7_drive_motor- This function drives the motor for the specific number of steps at the selected speed
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 Stepper 7 Click example
*
* # Description
* This example demonstrates the use of the Stepper 7 click board by driving the
* motor in both directions for a desired number of steps.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and performs the click default configuration.
*
* ## Application Task
* Drives the motor clockwise for 200 full steps and then counter-clockiwse for 200 half
* steps and 800 1/8th steps with 2 seconds delay on driving mode change. All data is
* being logged on the USB UART where you can track the program flow.
*
* @author Stefan Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "stepper7.h"
static stepper7_t stepper7;
static log_t logger;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
stepper7_cfg_t stepper7_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.
stepper7_cfg_setup( &stepper7_cfg );
STEPPER7_MAP_MIKROBUS( stepper7_cfg, MIKROBUS_1 );
if ( SPI_MASTER_ERROR == stepper7_init( &stepper7, &stepper7_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( STEPPER7_ERROR == stepper7_default_cfg ( &stepper7 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
log_printf ( &logger, " Move 200 full steps clockwise, speed: slow\r\n\n" );
stepper7_set_direction ( &stepper7, STEPPER7_DIR_CW );
stepper7_set_step_mode ( &stepper7, STEPPER7_MODE_FULL_STEP );
stepper7_drive_motor ( &stepper7, 200, STEPPER7_SPEED_SLOW );
Delay_ms ( 2000 );
log_printf ( &logger, " Move 200 half steps counter-clockwise, speed: medium\r\n\n" );
stepper7_set_direction ( &stepper7, STEPPER7_DIR_CCW );
stepper7_set_step_mode ( &stepper7, STEPPER7_MODE_HALF_STEP );
stepper7_drive_motor ( &stepper7, 200, STEPPER7_SPEED_MEDIUM );
Delay_ms ( 2000 );
log_printf ( &logger, " Move 800 1/8th steps counter-clockwise, speed: fast\r\n\n" );
stepper7_set_direction ( &stepper7, STEPPER7_DIR_CCW );
stepper7_set_step_mode ( &stepper7, STEPPER7_MODE_1_OVER_8_STEP );
stepper7_drive_motor ( &stepper7, 800, STEPPER7_SPEED_FAST );
Delay_ms ( 2000 );
}
int main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END
Additional Support
Resources
Category:Stepper
