MEMS (sensors)

WE have got the Library from ST for nordic Cortex M33 Processor after signing the agreement, and tried to use it for the integration: Sensors used are LSM6DSOX and LIS2MDL.the NCS zephyr uses -mfloat-abi=hardOn using the Library The MotionFX_CM33F_wc32_ot_hard.a It gets  compiled but in debug it gives error when the deice connects the Bluetooth."MFX empty_attitude   file motionFX.c"What may be the issue here? RegardsVivek 

Hello everyone,I have an X-NUCLEO-IKS4A1 expansion board connected to the STM32F401RE Nucleo board. The LIS2DUXS12 sensor on the expansion board incorporates a Qvar sensor capable of detecting changes in electrical charge near the external electrodes connected to the device. I have a detachable STEVAL-MKE001A board connected to the 2 x Header 3pin SMD for QVAR electrode.To activate the Qvar channel I set the AH_QVAR_EN bit to 1 in the AH_QVAR_CFG register (31h) and I set the INT1_ON_RES bit to 1 in the CTRL1 register (10h) so that the INT1 and INT2 pins are used to connect the electrodes to detect the Qvar signal.The problem is that the signal I read does not vary when I touch the electrodes as it happens when the LSM6DSV16X sensor as Qvar controller.Did I skip any steps by chance? It looks like the INT1 and INT2 pins of the sensor are not connected to QVAR1 and QVAR2

Dear all,A newbie here. Any help is much appreciated. I appreciate this is an STM forum and while I am using ESP-IDF to interface with STM's lsm303, I believe the problem is caused by my incorrect configuration of the STM lsm303 sensor. Hence any guidance is much appreciated.I am using an LSM303 sensor, connected via I2C to an ESP32 and programmed via ESP-IDF to retrieve the magnetometer and accelerometer data. I was previously using an Ardunio and the the Pololu LSM303 library and everything worked with the same wiring.However, when using bare i2c in ESP-IDF, it seems like I have messed something up as the magnetometer data freezes unless I power cycle the LSM303 (rebooting the ESP32 doesn't seem to change the readings, while unplugging the VCC of the lsm303 and plugging it back in again results in new readings).Here is the code, which reads the data at 50 Hz via I2C. I have checked various sources including the stack exchange electrical engineering forum and others but I am

Hi, I'm looking at the FSM capability of this module, and I'm having a hard time finding meaningful examples. The ST examples found here seem to contain meaningless strings.  "Ac 01 80Ac 04 00Ac 05 00Ac 5F 0AAc 46 01Ac 47 00Ac 0A 00" Am I missing something here? How do I learn how to use the FSM? The AN5226 document may contain all of the information but I'm feeling a lack of how to put it together....  thanks 

Hey, I have been using the AIS2IH accelerometer senson in my TI's am652 linux based board.i found the linux iio driver for this in the github of ST. click to view the supported driver for ais2ih. Click to view the driver files (named as lis2dw12).  i copied the files (lis2dw12.h,lis2dw12_core.c,lis2dw12_spi.c,lis2dw12.i2c,lis2dw12_buffer.c,lis2dw12_embfunc.c) to my linux (drivers/iio) directory. i created Kconfig and Makefile and also defined in the devicetree and in defconfig and built an image in jenkins and the image built was success without any errors. but the module file for the ais2ih is not present in the linux board in /lib/modules/<username>/kernel/drivers/iio  inside this in accel folder i have all the driver files but the accel folder itself missing and i dont know how to make that accel folder to show up. can you give me a solution to add this driver to my linux environment board so that i can make ais2ih sensor to work. give me a complete solution asap. Th

Hi, in my application I intend to use the LSM6DSV16X in order to store accelerometer, gyroscope, SFLP and QVar data, all at the same time.I am able to get XL, G and SFLP data from the FIFO on INT1 correctly, and now I want to also record QVar data.Based off of the example provided here: https://github.com/STMicroelectronics/STMems_Standard_C_drivers/blob/master/lsm6dsv16x_STdC/examples/lsm6dsv16x_qvar_read_data_polling.c , I was able to get QVar data alone by routing it to the INT2 pin, however when I also enable the FIFO, I don't receive the data ready interrupts anymore.Is there an incompatibility between these functions that I missed by reading the datasheet ? Here is the code that I am using to set up the sensor (the commented out section are the commands that prevent QVar data from getting output):int lsm6dsv16x_start_acquisition(bool enable_gbias) { lsm6dsv16x_pin_int_route_t pin1_int; lsm6dsv16x_pin_int_route_t pin2_int; lsm6dsv16x_fifo_sflp_raw_t fifo_sflp; lsm6dsv16x_

Hello!I recently designed a custom PCB with an LSM6DS3TR-C IMU. However, it doesn't seem like it responds to I2C and I wonder if anyone could take a quick look at the schematic I have for it to see if I've done a misstake. VCC in the schematic is 3.3V.Help appreciated :)

Long story short, I'm trying to use the MLC algorithm from the BLEMLC sample for SensorTile.Box Pro. However, I can't seem to read any output from the MLC. The MLC is working fine in the BLEMLC sample, but when I try it in my own file, it does not work. I've tried modifying the BLESensorsPnPL file with the MLC, and it still does not work.

Hello, I'm having trouble interacting with the SensorTile Box Pro through the BlueST protocol. I've used the ST BLE sensor app to set the device to stream compass data, I used the included example and did not change anything. In the app, I can receive compass data without a problem with its included visualiser. I then used the Lightblue app to receive the same data, and it worked without a problem. I used the BlueST datasheet to figure out which characteristic held the compass data, and subscribing to receive notifications worked immediately.The next step is where I seem to be blocked, I want to receive this data with an esp32 dev board. I used a xiao esp32c3 with the included bluetooth library. I wrote a very basic script that connects to the sensortile and subscribes to the characteristic. Connecting and finding the characteristic work without a problem, but I cannot get it to receive data at all. My arduino script is attached as a .c (the forum doesn't like .ino) for reference

Hi all,About 25% of the LSM6DSOX sensors in the field have a non-functional pedometer. The step count is showing as zero. A power-on reset or software reset does not resolve the issue. We rely on the step count provided by the pedometer module, but it is consistently reading zero. The wake-up interrupt is working correctly, but the step count interrupt and direct reading from the step count register both return zero. Please assist in addressing this issue. This is very critical as we are replacing a lot of devices because of this. Thanks,Vishnu Pradeep

Hi,  I am reading datasheet of LSM9DS1, and a little conccerned about the following part:  Especially about the text: "When a FIFO threshold interrupt occurs, the first data has been overwritten and theFIFO stops collecting data from the input channels."Why first data have to be overwritten? It looks more naturel not to be overwritten in FIFO mode. Thank you in advance.

Hello,I'm working on a project where I use the LSM6DSRX. I have noticed that the Gyro has a strange behavior, reporting peaks on the X axis while the device is solid static. The peaks may be correlated to the temperature change but it's not clear yet. I did run a test, on ambient temperature range +5C to +30 with two end-devices (DUT1 & DUT2) and one of the two reported the peaks on X axis at around 33C (internal temperature) while the other not. Is this something you have ever experienced or reported by any user? Since now all of my experiments shows that it is device related and not system related. I have replaced the LSM on some of the faulty and the issue seams to have been resolved. I have taken X-ray scans to verify that the soldering is acceptable and it is. Following raw data as read from the sensors Gyro from 3 different devices. You may see the noise coming after a few minutes with a duration of around 50-60 minutes The samples are taken every second. The noise is al

Posted on February 15, 2017 at 16:29Hello,I have an EVALSTPM34 board.I am trying to access the board via the UART using the 'STPM3x Evaluation Software' v3.1.0.0J7 has 3.3v supply attached. J2 has TTL-232R-3V3 cable attached.PC recognizes the TTL-232R-3V3  as COM5.J3 jumper is removed.SW1 has all SWs in ON position.I start up the STPM3x Evaluation Software.Options > Interface = USRT, COM5, 9600I press 'Open' and get success.Options > Configuration > Application tab = EVAL-STPM34I press 'Apply' and get a pop-up dialog box that says:Read buffer lenght insufficient.   < Yes, 'length' is mis-spelled.The operation has timed out.Has anyone had a similar experience?Is there a newer version of the 'STPM3x Evaluation Software' ?Rob ParsonsSchneider ElectricKnightdale NC USA

Hello, I have been working on a project using the H3LISD331Dl accelerometer set at +-400g and the STM32U585OI MCU. I wish to capture the high G shocks that occur during drop testing. I have completed my project and I am just wondering how accurate the results I am getting are. I secured my PCB inside an enclosure and did drops from various different heights focused on different axis. I attached .csv files for 3ft and 6ft drops focused onto the Z-axis. I plotted the data I got in excel and the increase in g's seem to correlate with the increase in drop height. Is there any way to guarantee the accuracy of the values I am recording? 

Hey! If I well understood the component IIS328DQTR will be at least "NRND" in 2025. The IIS3DHHC seems to be a good substitute but it doesn't have all the interrupt features of the IIS328DQTR. Can you confirm the lifetime of the IIS328DQTR? Do you have a 3-axis digital accelerometer with the feature: "The device may be configured to generate an interrupt signal through inertial wakeup events, or by the position of the device itself."Kind regardsCharles D 

Hello ST Community,I am currently working with the STHS34PF80 thermal presence sensor and utilizing the TMOS10-12030 lens to increase the field of view (FOV) to 120 degrees. However, I am encountering several issues that I hope you can assist me with:Limited FOV: Despite using the TMOS10-12030 lens, the FOV is still limited to around 25 degrees instead of the expected 120 degrees.Unstable Presence Detection: The sensor’s presence detection appears unstable, with limited detection range and frequent false positive detections and   negative detection (can't detect humans in front of him with in 1meter range) .Given these challenges, could you please provide any recommended configuration settings or adjustments to the sensor or lens setup that would help improve:Field of view (achieving the full 120 degrees)Detection stability and rangeReduction of false detectionsAny guidance or documentation you can provide to help resolve these issues would be greatly appreciated.Thank you fo

Hello STM Community,I am working with the STHS34PF80 presence detection sensor on an STM32WB55 development board, and I've encountered an unexpected issue with its detection behavior.Problem Description:When an object like plastic or paper passes in front of the sensor, it does not detect the object's presence, which I understand could be due to these materials not emitting enough infrared radiation. However, the problem occurs after the object is removed. Once the object is no longer in front of the sensor and there is no one around, the sensor unexpectedly detects a "presence."Observations:The sensor detects human presence accurately.The false presence detection only happens after an object (plastic, paper, etc.) is moved away.There are no obvious environmental changes (such as temperature shifts or airflow) when the false presence is detected.The object itself does not seem to be detected at all while in front of the sensor.Question:Has anyone experienced similar behavior with the S

Hi.I'm an intern working with the SensorTile.Box Pro for a project. As the subject suggests, I was wondering if the mobile app provided with the box could be modified, and if so, how?May sound like a dumb question, but I saw that the source code for the app on Github required an SSO authentication somewhere in the gradle files. I have little experience with such things and would appreciate if someone who knew more about this could help.The purpose of the modification was to change the GUI of the app among other things, such as triggering an SMS message when a specific event occurred.

I'm using the LIS2DW12 accelerometer to detect and classify different types of vibrations. I need to configure a wake-up threshold for a specific scenario.Two questions:1. When the sensor is set to 2g and I use the WK_THS[5:0] configuration, setting the register to 000001 corresponds to 2g/64 = 0.0312g. However, I'm trying to determine what this value represents in the recorded signal, which appears to range from 2048 to -2048. Does WK_THS[5:0] = 1 correspond to 0.0312/2 * 2024 = 31?2. Additionally, since the sensor may be mounted with a tilt, I’m considering applying a High Pass filter. Is this the correct approach to remove the DC/Tilt and ensure the wake-up is triggered only by vibration magnitude on one of the axes?Thank you for your help.

Hello Community,I am trying to implement a basic FFT computation on our STM32G0 MCUs using MotionSP for a 16-bit accelerometer signal.I am not sure why does MotionSP by default uses float32 for FFT when the original sensor signal is 16-bit?Can I then simply reconfigure the data type in the MotionSP by changing the float32 to q15?Kindly guide, as we do not have FPU to compute float32.Also, does a 16-bit sensor output requires a float32 FFT?@Eleon BORLINI 

Hello,I'm trying to disable temperature compensation on the lps22hh sensor, does anyone know if there's a specific register i can manipulate? Thanks!

Hi Sir, Can the LPS27HHW be used to detect non-water liquids, such as oil?  

Good afternoon!  I used an example from the link https://www.st.com/en/embedded-software/fp-ai-predmnt2.html   However, the card does not connect to the cloud, I have already downloaded the certificate and private key and it gives an error.              .           I need help.

Hello all,I am looking for more info on the gel used with ILPS28QSW.We want to use it in an application where the sensor may be submerged in 10% to 40% alcohol v/v for extended periods of time. Will the sensor be okay? Or is there another product which is more suitable for this application?Thank you,Regards,ShrinathN

Regarding the sensitivity of IIS3DHHC, the datasheet says 0.076mg/digit. It is written. To be exact 5g/2^16 (= 0.07629mg/digit) Is that correct?Thanks!