MEMS (sensors)

Hello ST engineer, our company is currently using your iis3dwb MEMS sensor. We have encountered an issue where we have found that its sampling rate is not the standard 26667 in different environments and varies depending on temperature. Additionally, during frequency domain conversion, the frequency spectrum waveform is shifted due to inaccurate sampling rate input. Do you have a solution to this problem? We have tried linear interpolation, but the effect has been poor. 

Hello,Could you provide the bias instability of ISM330DLC and LSM6DSV I could not find them in their datasheet ?Thank you by advance for your help

In the datasheet at page 13, the sensitivity is of 2096 LSB/hPa instead of 2048.

The measurement data of LIS2MDL was read in the application. Both the Y and Z axes were normal, and their data changed with the position. However, the data of the X axis was abnormal, and its value was the same as TEMP_OUT. Moreover, it was not related to the position. As shown in the screenshot below.                                 Chip settings: CFG_REG_A = 0X80Dear friends, could you please help me figure out what the problem is? Thank you!

Hello Community,I am currently developing a medical device and am utilizing the LSM6DSOX IMU sensor for user activity tracking. My goal is to implement functionality that can accurately track activities such as running, walking, and being steady.To achieve this, I’ve started by working with the MLC (Machine Learning Core) example provided in the ST GitHub repository. However, despite my efforts, we are not getting any output from the implementation.Could anyone provide guidance or suggestions on the following:Steps for implementing user activity tracking with the LSM6DSOX IMU sensor, specifically for activities like running, walking, and being steady.Common pitfalls or challenges that might cause issues like not getting output.Any best practices or recommendations for improving activity classification accuracy.I’d appreciate any advice or tips to help move forward with this project. Looking forward to your suggestions!  

Hello, it's code correct for  testing WHO_I_AM? LED doesn't work  #define LIS3DH_CS_LOW() HAL_GPIO_WritePin(GPIOE, GPIO_PIN_3, GPIO_PIN_RESET) #define LIS3DH_CS_HIGH() HAL_GPIO_WritePin(GPIOE, GPIO_PIN_3, GPIO_PIN_SET) #define LIS3DH_WHO_AM_I_REG 0x0F #define LIS3DH_READ_CMD 0x80 uint8_t LIS3DH_ReadWhoAmI(void) { uint8_t txData = LIS3DH_WHO_AM_I_REG | LIS3DH_READ_CMD; uint8_t rxData = 0; LIS3DH_CS_LOW(); HAL_SPI_Transmit(&hspi1, &txData, 1, HAL_MAX_DELAY); HAL_SPI_Receive(&hspi1, &rxData, 2, HAL_MAX_DELAY); LIS3DH_CS_HIGH(); if (rxData == 0x33) { HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12, GPIO_PIN_SET); } return rxData; }  

Hello,I use the STEVAL-MKI209V1K with the IIS2ILCX sensor. I am trying to get the IIS2ILCX communicating with a second IIS2ILCX via sensor hub. The master sensor is connected to my MCU via SPI. Please find my „schematic“ and the configuration code below.My problem is, that I cannot observe any I2C communication between the sensors. My oscilloscope just shows 3.4 V for each SCL and SDA. What could be wrong?I would greatly appreciate any suggestions. Additional information: i want to read the slaves data triggered by DRDY-Interrupt to get synchronized data of both sensors.accelerometer_write_register(accel, ACCEL_IIS2ILCX_REG_ADDR_FUNC_CFG_ACCESS, 0x00); accelerometer_write_register(accel, ACCEL_IIS2ILCX_REG_ADDR_FIFO_CTRL1, 0x7F); accelerometer_write_register(accel, ACCEL_IIS2ILCX_REG_ADDR_FIFO_CTRL2, 0x00); accelerometer_write_register(accel, ACCEL_IIS2ILCX_REG_ADDR_FIFO_CTRL3, 0x07); accelerometer_write_register(accel, ACCEL_IIS2ILCX_REG_ADDR_FIFO_CTRL4, 0x01); accelerometer_writ

I need to implement the  clock wise motion using the sensor like LIS3DH accelerometer with i2c protocol. Using NUCLEO-L031K6 Board. I don't know how to implement . If you have any reference. Please share it.    Thank you.

Hi,I see the following markings on IIS2DLPC.1) Dot - to identify the correct orientation of sensor2) 2D code - could be for traceability3 a letter "T"What does this letter "T" mean?Thank you!

Hi All,   I am working on a design that has been working for years. Now we wanted to design a revision of the PCB with the LSM6DS3TR but sadly it became obsolete and I can't find it back on the website of ST.Could the LSM6DS3TR-C be a Drop-In-Replacement for this part or another type? Thanks in advance & kind regards,

I am having STEVAL-STWINKT1 to be interfaced on USB channel for ST MEMS PC application.I have flashed DATALOG2_Release.bin in eval kit.I can get the ST MEMS PC Application showing the vibration sensor analysis graph. See attached.However, the issue I am facing is when the ST Eval board is moved from the desk to up in the air (only 1 cm). The firmware is hung, and the USB connection is lost. Can you suggest what is wrong with the firwmare?Also, if possible, I would like to connect the kit BLE channel with the ST MEMS application but it does not connect even then on MEMS applicaiton. Can you suggest if I need to use a different firmware? Or something else?

Hello ST Team,I am curious to know how LSM6DSV32X Accelerometers sensor communication takes place.So, basically what I am trying to understand here is when Master assigns some dynamic address to LSM6DSV32X Accelerometers sensor, then where exactly the sensor stores it?Do we have any sensor register for the same? Thanks & regards,Sourav

Hello ST team,I’m currently developing on the STEVAL-PROTEUS1 platform and encountered an issue when transitioning from the application firmware to the bootloader.Specifically, after executing a jump from the application to the bootloader (located at 0x08000000), the bootloader hangs during CPU2 initialization. It gets stuck at the following function call:SHCI_C2_BLE_Init(&ble_init_cmd_packet);This only occurs when jumping from the application. When powering on the board directly into the bootloader, everything works as expected, and BLE initialization succeeds.I have ensured that:CPU2 is not held in reset by the application before the jump.The jump procedure clears necessary registers (SCB->VTOR, stack pointer, etc.).Despite this, SHCI_C2_BLE_Init() does not return or proceed further.Has anyone experienced similar behavior on the STEVAL-PROTEUS1 or other STM32WB-based boards? Are there additional steps required to properly re-initialize CPU2 when switching from application to b

Good morning, I am programming a SensorTile using the STEVAL-STLKT01V1 expansion kit, and when I flash the program to the device, I encounter the following error:Break at address "0x8000270" with no debug information available, or outside of program code.

我想使用 LIS12DW12 来准确测试环境温度。我应该用什么方法校准芯片的准对，否则这个芯片不能准确测量温度？有没有关于他的实验错误的数据？Google translation:I want to use LIS12DW12 to accurately test the ambient temperature. How should I calibrate the chip, otherwise the chip cannot accurately measure the temperature? Is there any data about his experimental errors?

Hi,We are using your part# LSM6DSVTR ,Can you please advise for top marking.ThanksJay Trivedi

Hi, I am trying to create test the STEVAL-MKI194V1 for a test vehicle, which has LSM6DSR. However, I do not get an initialization response from it using the Zephyr device tree. So, I did a test (without the DSL driver) with the spi shell which gives me the correct chip ID output. Is the DSL driver compatible with the DSR? OR would I need a separate driver for both ?  Thanks, Devang   

We are using the LIS2DW12 accelerometer in our custom product. We understand that this sensor can detect movement or positioning along the X, Y, and Z axis. However, in our application, we need to detect when the device changes its orientation in terms of degrees—for example, when it flips or tilts significantly from one position to another.Can the LIS2DW12 generate an interrupt based on such orientation changes (e.g., using 6D orientation detection)? We are looking for a way to trigger events when the device is rotated beyond a certain angle.Thank you

I have implemented 9D orientation calculation on the STM32L4 using the LSM6DSO16IS and LIS2MDL sensors. Since there is an initial delay when flashing the program onto the ISPU, I chose to implement the algorithm on the STM32 itself, bypassing the ISPU.The issue I'm facing is that the yaw axis value changes when I move the system and place it back in the same position—even after calibrating the magnetometer. I am using motionfx.h for both magnetometer and gyroscope calibration.I believe the problem lies in the gyroscope calibration. When I set iKnobs.LMode = 1 (static mode), the gyroscope does not calibrate during motion, and the resulting drift affects the yaw angle. To address this, I also tried setting LMode = 2 (dynamic mode). However, in dynamic mode, calibration saturates after some time and stops updating. After that, the yaw value continues to drift even when the device is stationary.Below is the code snippet I am using for orientation calculation and sensor calibration.Question

Hi, I'm putting down a LIS2DH12 accelerometer on a new PCB. The datasheet calls for an aluminum capacitor on VDD, but the eval board (STEVAL-MKI151V1) shows a small capacitor that looks like a ceramic. I don't know for sure because I can't find the BOM for the eval board. I really don't have clearance for an electrolytic capacitor. How critical is it?

Hello STM32 Community,I’m currently working with the STEVAL-PROTEUS1 evaluation board, which integrates an STM32WB5MMG microcontroller and an IIS2DLPC MEMS accelerometer. I’m using the board together with the ST BLE Sensor mobile app, and it works great out-of-the-box for streaming sensor data over BLE.However, I’d like to change the sampling frequency (ODR) of the onboard accelerometer to suit my specific application needs. For example, I want to increase the data rate to 800 Hz, instead of the default (which seems to be 25 Hz or 50 Hz).What I’ve done So Far: int32_t IIS2DLPC_Init(IIS2DLPC_Object_t *pObj){  /* Enable register address automatically incremented during a multiple byte  access with a serial interface. */  if (iis2dlpc_auto_increment_set(&(pObj->Ctx), PROPERTY_ENABLE) != IIS2DLPC_OK)  {    return IIS2DLPC_ERROR;  }  /* Enable BDU */  if (iis2dlpc_block_data_update_set(&(pObj->Ctx), PROPERTY_ENABLE) != IIS

Although these devices are technically "water resistant", they are sometimes described as "water proof" (even in STM materials), and the data sheet permeability of the gel is quite low. Clearly these devices can survive immersion for at least several hours, but for how long, really...There are several posts on here asking questions about this, but no quantitative answers. Has anyone (ST engineers especially) conducted experiments on device drift or lifetime for continuous immersion in water (without worrying about aggressive chemicals or surfactants)?What is the drift or lifetime for direct immersion?What about if a flexible membrane is used as an outer layer of protection (e.g. a thin layer of nitrile rubber). Polymer membranes won't be impereable, of course, but would be something which would not resist pressure change but should limit the sensor to contact with water vapour rather than liquid.

I followed most of the examples to get data such as accel, gyro, timestamp and temperature from the github repo using fifo interrupts. I also used the mlc_gym example to get data from a MLC configuration that I designed on Mems studio.  My question is, can I use both configurations at the same time? like have an interrupt for the fifo data ready and one interrupt for the MLC? As in, I am constantly reading raw accel/gyro/timestamp/temp data at a fixed 60Hz on interrupt 1 and also get a new MLC state on interrupt 2?

Hi All,I use STHS34PF80 for presence detection with embedded algorithm however it easily get stuck in presence status and cannot release from the status.Use case:People sit in from of the sensor around 30 cm, with lens on STHs34PF80.When people enter the FOV it's triggered as presence status.When people sit still for a while (e.g. 30 min), the TPresence keeps glowing.When people leave, TPresence drops however it cannot across threshold.TPresence will keep fall very slowly until it across the threshold however sometime it will never across below the threshold.Red line: presence flagOrange line: TPresence valuemy settings:lpf_m: DIV_200lpf_p: DIV_200lpf_p_m: DIV_9lpf_a_t: DIV_50ODR: 4Hzchange lpf_p to DIV_50 doesn't help Any idea why TPresence keeps rising when people sit still and fall very slowly after people leave ?And how to solve the issue ?       

Hi everyone, I'm developing a tamper detection circuit for a meter enclosure. I'm considering the STHS34PF80 infrared proximity sensor, but I'm struggling to find reference materials or application notes specifically related to tamper detection using this sensor. My goal is to use the sensor as an interrupt generator, similar to a switch. When someone opens the enclosure lid, the sensor should detect the change in proximity and trigger an interrupt signal to the microcontroller, indicating tampering. Can anyone recommend reference materials or alternative sensor options suitable for tamper detection in this application? Thanks.