Achieve accurate measurement of vertical velocity with FXLS8974CF, MPL3115A2 and STM32F030R8
Measure the speed at which an object is ascending or descending vertically
Published Feb 26, 2024
Click board™
Accel&Pressure Click
Dev Board
Nucleo-64 with STM32F030R8 MCU
Compiler
NECTO Studio
MCU
STM32F030R8
Unlock precise vertical velocity insights and determine your application's exact rate of ascent or descent
A
A
Hardware Overview
How does it work?
Accel&Pressure Click is based on the FXLS8974CF, a 3-axis low-g accelerometer, and the MPL3115A2, a precision pressure sensor with altimetry, both from NXP Semiconductor. The accelerometer has a ±2/4/8/16 g user-selectable, full-scale measurement range with a 12-bit acceleration data output. It can work in several modes, such as active, hibernate, standby, and more. The integrated FIFO/LIFO buffer of 144 bytes can store 32 12-bit X/Y/Z/ data triplets. The sensor also has flexible data change detection, such as motion, freefall, and other inertial events. The pressure sensor has an absolute operating range of
20kPa to 110kPa in 20-bit measurements. Besides the pressure, the MPL3115A2 can also measure the altitude in a range of -698 up to 11775 meters in a 20-bit resolution. It also comes with an embedded FIFO (32 samples) and up to 12 days of data logging using the FIFO. Both sensors have an integrated temperature sensor and are temperature-compensated. Accel&Pressure Click uses a standard 2-wire I2C interface to allow the host MCU to communicate with both sensors. If the motion is detected, the FXLS8974CF uses a motion MOT pin to interrupt the host MCU. Depending on your application, you can choose one of the
available pins (PWM, AN, CS) by soldering one of the jumpers (R8, R9, R10) to control the hibernation mode wake-up function of the FXLS8974CF. In addition, there are LP Cut jumpers at the bottom of the Accel&Pressure Click board™, with which a low power consumption feature can be achieved. 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 STM32F030R8 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-M0
MCU Memory (KB)
64
Silicon Vendor
STMicroelectronics
Pin count
64
RAM (Bytes)
8192
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
Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Nucleo-64 with STM32F030R8 MCU as your development board.
Track your results in real time
Application Output
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 Accel&Pressure Click driver.
Key functions:
accelpressure_get_axes_data- This function reads the accelerometer sensor axes data.accelpressure_get_pressure- This function reads the sensor pressure data conversion in mbar.accelpressure_get_temperature- This function reads the conversion of sensor pressure data in degrees Celsius.
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 AccelPressure Click example
*
* # Description
* This library contains API for the AccelPressure Click driver.
* The library initializes and defines the I2C drivers to
* write and read data from registers, as well as the default configuration
* for the reading accelerator, pressure, and temperature data.
*
* The demo application is composed of two sections :
*
* ## Application Init
* The initialization of the I2C module, log UART, and additional pins.
* After the driver init, the app executes a default configuration.
*
* ## Application Task
* This example demonstrates the use of the AccelPressure Click board.
* Measures and displays acceleration data for the X-axis, Y-axis, and Z-axis [mg],
* pressure [mBar], and temperature [degree Celsius] data.
* Results are being sent to the UART Terminal, where you can track their changes.
*
* @author Nenad Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "accelpressure.h"
static accelpressure_t accelpressure;
static log_t logger;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
accelpressure_cfg_t accelpressure_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.
accelpressure_cfg_setup( &accelpressure_cfg );
ACCELPRESSURE_MAP_MIKROBUS( accelpressure_cfg, MIKROBUS_1 );
if ( I2C_MASTER_ERROR == accelpressure_init( &accelpressure, &accelpressure_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( ACCELPRESSURE_ERROR == accelpressure_default_cfg ( &accelpressure ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
log_printf( &logger, "_________________\r\n" );
}
void application_task ( void )
{
accelpressure_axes_t acc_axis;
float pressure = 0, temperature = 0;
if ( ACCELPRESSURE_OK == accelpressure_get_axes_data( &accelpressure, &acc_axis ) )
{
log_printf( &logger, " Accel X: %.2f mg\r\n", acc_axis.x );
log_printf( &logger, " Accel Y: %.2f mg\r\n", acc_axis.y );
log_printf( &logger, " Accel Z: %.2f mg\r\n", acc_axis.z );
}
log_printf( &logger, "_________________\r\n" );
Delay_ms( 100 );
if ( ACCELPRESSURE_OK == accelpressure_get_pressure( &accelpressure, &pressure ) )
{
log_printf( &logger, " Pressure: %.2f mbar\r\n", pressure );
}
Delay_ms( 100 );
if ( ACCELPRESSURE_OK == accelpressure_get_temperature( &accelpressure, &temperature ) )
{
log_printf( &logger, " Temperature: %.2f mbar\r\n", temperature );
}
log_printf( &logger, "_________________\r\n" );
Delay_ms( 1000 );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
