MEMS (sensors)

I have a question about the MEMS audio sensor MP23DB01HP. I think i already undertood that the output is a PDM, but my question is, how can I convert that to obtain a corresponding value in dB? Or some used unit? I have done the acquisitons, but know i don't know what to do with that values... Thank you in advance for your replies

Hello, We would like to integrate LSM6DS3TR sensor.For that to happed we need SEE (Secure Execution Environment) framework drivers for Qualcomm based processors. Could you please supply drivers for that? It is urgent. Thank you.Best regards,Miha

I tried to obtain roll pitch and yaw with the help of motionfx in the x-cube mems1 package by reading data with spi using ASM330LHH, LIS3MDL and LIS2DH12 sensors. I cannot try my code because I do not have the sensors available at the moment. Can you review the code, is there a faulty or missing part? I would appreciate if you can help me. I present the CS pin settings and the project in the attachment      /* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2025 STMicroelectronics. * All rights reserved. * * This software is licensed under terms that can be found in the LICENSE file * in the root directory of this software component. * If no LICENSE file comes with this software, it is provided

Hi,I am using the ism330dhcx and lis2mdl and run the MotionFX  algo.the ism330dhcx data rate is 104Hz and the lis2mdl is set to 100Hz (sensor hub ODR set to 104Hz)should i run MotionFX  algo at 100Hz or 104Hz ?on ST examples, when the ODR is set to 104, the ALGO_FREQ is set to 100 !is this difference can generate wrong values on fusion algo ?i notice that if i run the magneto calibration at 104Hz, the calibration is never reachif i use 100Hz for magneto calibration and 104Hz (or 100) for MotionFX  algo it is workThank you,Sincerely.

HiI am not an IMU expert. My current task is to upgrade an old board which used LSM6DSL(gyro abd accelerometer ) and lsm303agr(Magnetometer) to caliculate orientation of a human head.As far as I can see LSM6DSV would be providing orientation data without gyro. So I dont need a magnetometer?When it comes to orientation data, what is the benefit of having a magnetometer? How does it come LSM6DSV is doing the job without magnetometer?

[EDIT 03/04/25 09:15:35 AM] Well, it appears that, as usual, the real issue was sitting right in front of the keyboard… and could have been solved with a good old ‘Read The Freaking Manual.’ My deepest apologies for this classic case of user error! :grinning_face_with_sweat:Sensor_ID inversion (0x01 and 0x02) I'm struggling with programming the ISM330DHCX on a sony spresense. By following the documentation I write my register with these values:CTRL1_XL: 0b01001000CTRL2_G: 0b01001100FIFO_CTRL1: 0b10010000FIFO_CTRL2: 0b00000000FIFO_CTRL3: 0b01000100FIFO_CTRL4: 0b00000110FIFO_CTRL3C: 0b01000100The I read the FIFO (SPI) with this kind of code :    void ISMSensor::read_FIFO(uint8_t *buffer, uint

Would it be possible to connect and send sensor data to a Pi Pico W from the STEVAL-MKBOXPRO? I’m looking for a way to connect them together via Bluetooth but a wired connection would be alright too. I have connected a Pico to the sensortile box via Bluetooth already but I do not know how I can gather sensor data from this. Also is there any official or unofficial documentation on any similar endeavors? I’ve found this link which seems promising but the implementation is not very detailed https://community.st.com/t5/mems-and-sensors/how-to-create-a-custom-gaming-controller-using-sensortile-box/ta-p/597296. 

I want to read acc and gyro data from my ASM330LHH sensor with spi communication, but I can't try the code because I don't have a sensor at the moment, can you take a look at the code, is there anything wrong or missing?(I selected the SPI_CS pin as PA4 and set it as in the screenshot, is it correct?)(Do I need to write BSP_SPI1_Init(); in main function?)(Should I use the ASM330LHH_Init(&imu); function last after scale and enable functions?)  /* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2025 STMicroelectronics. * All rights reserved. * * This software is licensed under terms that can be found in the LICENSE file * in the root directory of this software com

I have ASM330LHH, LIS3MDL and LIS2DH12 mems sensors. I want to read data with spi communication using the x-cube-mems1 package. There are sample codes with I2C and bsp, but I don't know how to do this with spi. Can anyone help me to obtain roll pitch and yaw values with the help of these three sensors?

there are two kinds of linux driver for lis2dw12 in LIS2DW12 - 3轴MEMS加速度计，超低功耗，可配置单/双击识别，自由落体，唤醒，纵向/横向，6D/4D方向检测 - 意法半导体STMicroelectronics which is LinuxDriverIIO and LinuxDriverInput,1.what's the difference, which should we use, Do you have an application note about this?2.now we use LinuxDriverInput, we have already add into kernel driver, and IIC is now OK, and we have got device node, but when we configure ./accel/enable, the software is stocked. Could you give some help, thanks! 

Could you tell me the differences between the IIS2DLPC and LIS2DW12?According to the reference URL, are there any differences between these two devices other than product longevity and guaranteed parameter values? I am particularly interested in whether there are any differences at the wafer level.From a business continuity perspective, we would like to evaluate both the IIS2DLPC and LIS2DW12. However, it would be a waste to evaluate the same hardware twice. If it can be confirmed that there are no differences, we would like to evaluate only the LIS2DW12. Reference URL:https://community.st.com/t5/mems-sensors/iis2dlpc-vs-lis2dw12/m-p/179418

Hi all,I'm trying to understand how can I use this ST lib to activated interrupt if accelerometer data ready. I already use this lib but I don't use interrupt mode, right now I'd like to try it.So if I understand well I have to use int32_t lsm6dso32_pin_int1_route_set(const stmdev_ctx_t *ctx, lsm6dso32_pin_int1_route_t *val) I've find it in the datasheet :. Write INT1_CTRL = 01h // Accelerometer data-ready interrupt on INT1 in Startup sequence part 4.1, so if I want to activate the interrupt I have to write 0x01 in INT1_CTRL register, but I'm little lost to how to use typedef struct { lsm6dso32_int1_ctrl_t int1_ctrl; lsm6dso32_md1_cfg_t md1_cfg; lsm6dso32_emb_func_int1_t emb_func_int1; lsm6dso

Hello, @Andrea VITALI,After using the WESU board (https://community.st.com/t5/mems-sensors/lsm6ds3-lis3mdl-calibration/td-p/762534)we decided to move forward with the sensor tile box PRO. We want to record human activity recognition and pedometer information in the SD card, with a timestamp. We managed to record HAR and pedometer information separetly, on BLE or in a SD card file, but :* If we add the RTC value (for timestamp) to the HAR example, we got the message FLOW_COMPATIBILITY_ERROR* If we enable pedometer, adding gyroscope and accelerometer (60Hz, same as HAR example) in input, add HAR in function, there is no data in the SD card (only header in the csv file), and no updates in Bluetooth (event when SD_Log is updated in log status)Is it possi

Hello!We are developing with the sensor IIS3DWB. I am able to interface it by spi like mentioned in st's github example, and I'm able to use st's platform independend c-drivers. It works fine, I get Acceleration, Temperature, device-ID...In that example the SPI is used in blocking mode and the NSS pin is set by software. Now I want to drive the SPI (with st's SPI-HAL) in non-blocking mode, and I want to drive the NSS-Pin by hardware. Refering the sensor's data sheet, it seems that I need to configure the SPI with CPOL high (CPOL-bit =1), and CPHA to second clock phase (CPHA-bit = 1). But the MCU's reference manual (RM0394, page 1326) says, that the NSS-Hardware-Output-Mode requires clock-pahse-configuration CPHA-Bit==0 (=first clock edge). Is there any way to bring it to work? (If that helps: The sensor will be the only spi device connected to the mcu)Does the sensor accept any other spi setup which is compatible to the MCU when the M

Hello, we are using the ASM330LHH in our product and are doing some bandwidth testing and trying to model the gyro channel behavior. Our settings are ODR = 6667Hz, LPF1 bandwidth = 470, LPF2 =3333Hz. Looking at the data sheet "Gyroscope filtering chain" (Figure 11 of DocID031239 Rev 4) can you describe the pre-ADC analog anti-aliasing low pass filter corner frequency and order , and the ADC output sample rate? For some of our test conditions we suspect we are seeing unexpected aliasing of energy into the gyro outputs, and so wish to understand better that filter and ADC output rate.Also, do you have any application notes regarding use of the gyro High-pass filter (Table 55, HPM_G)?Thank-you, tjbh

Dear SupportI want to add timestamp registration to the FIFO.I already use FIFO to save gyroscope and accelerometer samples, but I'm struggling to add timestamps.Since ODR is too high for polling mode the only solution is this one.I attach some code snippets to make it clear, also consider them as pseudo code taken from a more complex structure.ism330dlc_fifo_time_set and timer_rd are not present in the library but I wrote them based on the AN5125 int32_t ism330dlc_fifo_time_set(stmdev_ctx_t *ctx, uint8_t val) { ism330dlc_fifo_ctrl2_t fifo_ctrl2; int32_t ret; ret = ism330dlc_read_reg(ctx, ISM330DLC_FIFO_CTRL2, (uint8_t *)&fifo_ctrl2, 1); if (ret == 0) { fifo_ctrl2.fifo_timer_en = val; ret = ism330dlc_write_reg(ctx, ISM330DLC_FIFO_CTRL2, (uint8_t *)&fifo_ctrl2, 1); } return ret; }​ uint64_t ism330dlc_timer_rd(stmdev_ctx_t *ctx) { uint64_t time = 0; uint8

Hi,I'm trying to use LIS2MDL magnetometer sensor with 4 wire bus but I'm encountering a problem with the library.Here is my init function:lis2mdl.c library screenshot:On line 122,  my instance is always initialized (is_initialized=1) by the init function (line 113) so it

Hi,I am using MotionFX Library on stm32wl55 (CM4 without FPU). run at 48MHz (max frequency)it is impossible to run MotionFX_CM4F_wc32_ot.aso i use :MotionFX_CM3_wc32_ot.a and it is work. by debugging, the MotionFX_manager_run function take different execution time in different cycles?. in general, it tack 1 or 2 ms for 3 or 4 cycles, than 10 to 15 ms for the 5th cycle ! (trying Oz and Ofast optimisation)it is normal ?in attachment a screenshot for fusion execution real time record.  the lowest recommended frequency on the UM2220 is 100Hz.in my case it is just impossible to do faster !so is the library can work correctly if i set a lower frequency ?the third argument in MotionFX_manager_run(pdata_in, pdata_out, MOTION_FX_ENGINE_DELTATIME) can be a variable (se

I need to develop a low-power embedded device with pedometer functionality. I'm looking at the LIS3DH because of it's low power, but there's no built-in pedometer application. I've also looked at the LSM6DSL, as it has built-in pedometer support, but the power consumption is ~8x higher. Is there a low-power IMU with built-in support for step counting? Or are these my best options? I'd like to minimize power consumption by the IMU as well as power consumption by the MCU controlling the IMU.Thanks!Brian

I have an LSM6DSV16X configured to generate an interrupt on INT1 whenever the FIFO contains more elements than a specified threshold, which I set using the driver function lsm6dsv16x_fifo_watermark_set().However, I noticed that sometimes the microcontroller receives a second interrupt immediately after the first one. Checking the INT1 signal with an oscilloscope, I observed this irregular behavior:An interrupt lasting about 350 microseconds, immediately followed by another interrupt of about 3 microseconds.Why does this happen?

Hello,Please the pressure sensor LPS22DF is it recommanded for a new design ?Thank you

Issue with Wrist Tilt Direction Detection on LSM6DS3TR-CHardware & Software Details:- Sensor: LSM6DS3TR-C- Platform: Arduino- Interface: I2CProblem Statement:We are working on detecting wrist tilt using the LSM6DS3TR-C sensor. While the tilt detection interrupt (`wrist_tilt_ia`) is triggering correctly, the tilt direction values (`wrist_tilt_ia.xpos`, `wrist_tilt_ia.xneg`, etc.) always remain zero, regardless of the actual movement.Configuration Steps Taken:Sensor Initialization:Verified sensor presence using lsm6ds3tr_c_device_id_get().Performed a software reset using lsm6ds3tr_c_reset_set().Enabled Block Data Update (BDU) to ensure data consistency.Sensor Configuration:Set accelerometer output data rate to 26Hz (lsm6ds3tr_c_xl_data_rate_set()).Set gyroscope output data rate to 26Hz (lsm6ds3tr_c_gy_data_rate_set()).Configured accelerometer full scale to ±2g and gyroscope to ±2000 dps.

Hello there,  Are there any examples on how to use the inactivity feature of the lsm6dsv16x?I checked the github and I only see for waking up, but not the other way around. My goal is to set a device to sleep once there is no motion from imu. meaning, once the imu has no motion, it sets an interrupt like hey there is no motion going on, go to sleep/off mode. Then once there is motion, I want the imu to fire a interrupt telling device, here wake up. Is it possible to use one Interrupt pin for both cases or do I need to use both?

I am using steval mkbox-pro with FP-SNS-DATALOG2 to get acceleration from the subway train.How can i remove the gravity effect in measurements from the LSM6DSV16X accelerometer? 

Hello,I'm trying to calibrate the gyroscope of LSM6DSO MEMS but I don't really understand what describe the quality parameter in the MGT_state_t structure. I didn't find any information about it in the datasheet. Could you explain it to me ?I succeeded few times to calibrate the gyroscope but sometimes even with the quality close to 0 (1e-8) the bias are not good at all. Is there a procedure to follow to achieve the gyroscope temperature calibration ? And when the bias are better, there is always an offset. How can I resolve it ?