Provide accurate measurements of acceleration, angular velocity, and orientation with ASM330LHHXG1 and STM32G474RE
6-axis automotive inertial measurement unit (IMU) with embedded machine learning core and dual operating modes
Published Nov 08, 2024
Click board™
Smart DOF 5 Click
Dev. board
Nucleo 64 with STM32G474RE MCU
Compiler
NECTO Studio
MCU
STM32G474RE
Achieve precise motion and orientation detection perfect for dead reckoning, vehicle telematics, and antitheft systems.
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Hardware Overview
How does it work?
Smart DOF 5 Click is based on the ASM330LHHXG1, a high-accuracy 6-axis inertial measurement unit (IMU) from STMicroelectronics, designed for precise motion and orientation detection in automotive applications. Built to meet the AEC-Q100 standards, the ASM330LHHXG1 features a 3-axis digital accelerometer and a 3-axis digital gyroscope. It uses ST's proprietary micromachining technology for its sensing elements and CMOS technology for the IC interfaces. This combination ensures precise circuit matching with the sensor's characteristics, improving performance. The sensor supports dual operating modes, high-performance and low-power, catering to different use cases depending on power efficiency and data precision needs. The ASM330LHHXG1 offers a flexible full-scale acceleration range of ±2/±4/±8/±16g and an extensive angular rate range of ±125/±250/±500/±1000/±2000/±4000dps. This flexibility allows the sensor to perform well in various automotive applications, including dead reckoning, telematics, vehicle-to-everything (V2X), antitheft systems, and motion-activated functionalities. The sensor is also designed for superior output stability, featuring extremely low noise and full data synchronization.
This Click board™ is designed in a unique format supporting the newly introduced MIKROE feature called "Click Snap." Unlike the standardized version of Click boards, this feature allows the main sensor area to become movable by breaking the PCB, opening up many new possibilities for implementation. Thanks to the Snap feature, the ASM330LHHXG1 can operate autonomously by accessing its signals directly on the pins marked 1-8. Additionally, the Snap part includes a specified and fixed screw hole position, enabling users to secure the Snap board in their desired location. This board supports communication with the host MCU through either SPI (maximum clock frequency of 10MHz) or I2C (maximum clock frequency of 400kHz) interfaces, with I2C being the default option. The communication interface is selected by adjusting the COMM SEL jumper to the desired position. To enhance flexibility, particularly with the detachable Snap section of the Click Snap format, an additional COMM 1 jumper is available. This jumper functions similarly to the COMM SEL, allowing for independent communication interface selection when the Snap section is used independently. To ensure proper functionality, all COMM jumpers must be set to the same interface.
For those using the I2C interface, the board also provides an ADDR jumper, enabling users to configure the I2C address as needed for their specific application. Beyond communication, this board is also equipped with an INT pin, which acts as an event-detection interrupt, essential for reliable motion-activated features. These include hardware recognition of events such as free-fall, 6D orientation, activity and inactivity states, and wake-up triggers. In addition to the previously mentioned features, the Snap section also includes an unpopulated 8-pin header, which allows users to use the ASM330LHHXG1's I2C Master interface for controlling external sensors. This provides added flexibility by enabling the integration of additional sensor modules, making it easier to expand the board's functionality for more complex applications. 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-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.
Microcontroller Overview
MCU Card / MCU
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.
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 64 with STM32G474RE 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 Smart DOF 5 Click driver.
Key functions:
smartdof5_get_int_pin- This function returns the interrupt 1 pin logic state.smartdof5_get_data- This function reads the accelerometer, gyroscope, and temperature measurement data.smartdof5_set_accel_fsr- This function sets the accel measurement full scale range.
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 Smart DOF 5 Click example
*
* # Description
* This example demonstrates the use of Smart DOF 5 click board by reading and displaying
* the accelerometer and gyroscope data (X, Y, and Z axis) as well as a temperature measurement
* in degrees Celsius.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and performs the click default configuration.
*
* ## Application Task
* Waits for a data ready indication and then reads the accelerometer, gyroscope, and temperature
* measurements. The results are displayed on the USB UART at 12.5 Hz output data rate.
*
* @author Stefan Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "smartdof5.h"
static smartdof5_t smartdof5;
static log_t logger;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
smartdof5_cfg_t smartdof5_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.
smartdof5_cfg_setup( &smartdof5_cfg );
SMARTDOF5_MAP_MIKROBUS( smartdof5_cfg, MIKROBUS_1 );
err_t init_flag = smartdof5_init( &smartdof5, &smartdof5_cfg );
if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( SMARTDOF5_ERROR == smartdof5_default_cfg ( &smartdof5 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
smartdof5_data_t meas_data;
if ( smartdof5_get_int_pin ( &smartdof5 ) )
{
if ( SMARTDOF5_OK == smartdof5_get_data ( &smartdof5, &meas_data ) )
{
log_printf( &logger, " Accel X: %.3f g\r\n", meas_data.accel.x );
log_printf( &logger, " Accel Y: %.3f g\r\n", meas_data.accel.y );
log_printf( &logger, " Accel Z: %.3f g\r\n", meas_data.accel.z );
log_printf( &logger, " Gyro X: %.1f dps\r\n", meas_data.gyro.x );
log_printf( &logger, " Gyro Y: %.1f dps\r\n", meas_data.gyro.y );
log_printf( &logger, " Gyro Z: %.1f dps\r\n", meas_data.gyro.z );
log_printf( &logger, " Temperature: %.2f degC\r\n\n", meas_data.temperature );
}
}
}
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
Category:Motion
