MEMS (sensors)

Hello, I am using a LSM6DSL sensor and when applying a 2G acceleration without rotating the board, I get very important spikes on the gyroscopes of about -90°/s to +90°/s amplitude.This is very strange. Is this a normal behaviour from this sensor ? Are there settings or ways to avoid this ?I noticed the exact same behaviour on the LSM6DSV16X sensor.Thank you for your help

Hi,I have an application with LSM9DS1 sensor and I expected that when I change LSM9DS1 sensor position from horizontal to vertical value will change but changed only when sensor was moving but after that valus comes almost same for horizontal or vertical position.  I don't understand how its working. I have smole expirience with sensor ADXL345 and this sensor on horizontal possition give me values arround 0, on vertical position values is arround 256 (- +) and that is clear for me.Thanks for any explenation - helps.Regards Jarek

In high-accuracy ODR mode, can the frequency of writing to the fifo be automatically aligned,for example 960 to 1000hz  

Hi Team,I searched sensor fusion performance information of LSM9DS1TR, LSM6DSO IMUs as below,1. Static Accuracy (Yaw, Pitch, Roll) = ?2. Dynamic Accuracy (Yaw, Pitch, Roll) = ?3. Orientation Settling time = sec?However, I did not find it in the respective datasheets. I need to know the accuracy of the IMU from ST. Could anyone share the above details?

In MEMS Studio under advanced features > MLC I upload a data pattern and label it under the "Data Pattern" tab. On the "Datalog analysis" tab when I click the Run button it gives the following error.Path: resample_odr.exe does not exist. Please check location of 'resample_odr.exe' This file does not exist on the pc anywhere. This error does not yield any results with an internet search.Operating System : Windows 10MEMS Studio version 1.3.0Any help would be appreciated.  

Hello all, I wanted to use sensortile to collect data on microsd card. (I have two of them) So, One portable cradle from the kit working good, but another is not working with the same microsd card. When start it from the android app the sensor just behave like normal but after several seconds disable sd logging completely. Need to say that I do not see any files on SD card after the procedure. Also, I did check solder joints and didn't notice any problems with soldering.

Hello,the LIS2DUX12 documentation (AN5903: LIS2DUX12: machine learning core) contains a table explaining how meta-classifier works:At the third column from the end of the table, the decision tree gives the result "A".As far as I understand, the "B" counter should have decreased, but it didn't. Why?

Hi, I'm trying to use the IIS3DWB as FIFO mode with a watermark.I'm using a custom board. I double checked the hardware and guaranteed this board works well. I'm able to read/write the sensor using SPI interface and generate interrupt with wake-up int source.To handle the sensor, I'm using the library created by ST. https://github.com/STMicroelectronics/iis3dwbIn this mode the interrupt INT1 not works well. This is my init code:// Reset the sensor iis3dwb_reset_set(&hAcc, PROPERTY_ENABLE);   do { iis3dwb_reset_get(&hAcc, &reset); HAL_Delay(BOOT_TIME); } while (reset);   iis3dwb_xl_data_rate_set(&hAcc, IIS3DWB_XL_ODR_26k7Hz); iis3dwb_xl_full_scale_set(&hAcc, IIS3DWB_2g); iis3dwb_fifo_mode_set(&hAcc, IIS3DWB_STREAM_MODE); iis3dwb_fifo_watermark_set(&hAcc, 256); iis3dwb_fifo_xl_batch_set(&hAcc, IIS3DWB_XL_BATCHED_AT_26k7Hz); iis3dwb_block_data_update_set(&hAcc, 1);   int1_route.fifo_th = 1; int1_route.fifo_ovr = 1; int1_route.fifo_

I want to setup the wakeup configuration registers and then disconnect the accelerometer from an I2C programmer and power source. When the accelerometer is placed with the new circuit, will the configurations in the register I have set still remain? The datasheet does not mention non-volatile memory on registers.

I'm using an ESP32 to communicate with the VL53L3CX. I successfully reworked the vl53l3cx_platform.c file to get communication working with the sensor using I2C, which is a good start. But when I go to read from the sensor (using polling, not hardware interrupt mode) I can't seem to get any valid measurements. The status of the readings mostly alternates between 4 and 5, with an occasional 14. I see plenty of negative distance measurements. But unfortunately, not status readings of 0 indicating that the reading is valid (not that I'd expect negative distance readings to be valid). Screenshots of logs are at the bottom of the post.I do not perform any calibration for now as I'm just trying to get some initial readings. Could this be the problem? I wasn't sure if the sensor must be calibrated before measurements can be successfully collected.My code works as follows:Initialize I2C codeVL53LX_WaitDeviceBootedVL53LX_DataInitVL53LX_StartMeasurementVL53LX_GetMeasurementDataReadyOnce ready, V

Hi, I try to use IIS3DHHC as a simple inclinometer. I learnt that to get stable readings it may be a good idea to process raw data using Extended Kalman Filter (EKF). Some ST demonstrations available on YT mention that as well, but I found no source code.I have tested several solutions found on Github but so far I found no good EKF implementation, preferably based on CMSIS-DSP or Eigen3 libs.Could anyone advise?A similar question was asked exactly 10 years ago here but it has not been answered yet.

Hi,i am using ism330dhcx and lis2mdl on my custom board,i am able to configure and read data from accelero, gyro and magneto.i started the implementation of X-Cube-MEMS1 lib.when i compile the code, every thing is ok,but after running, when a function is called from the MEMS1 libraries, the code is blocked !i tried different example (fusion, magneto calibration, ecompas)i am usin the CM4 of stm32WL55. this core don't contain a hardware FPU. i tested with xxx_CM3_wc32_ot.a and xxx_CM4_wc32_ot.a files  here are the setting of my compiler :  it is blocked in the first call of any function from xxxxx_wc32_ot.a files any suggestion to resolve that ? Thank you,Sincerely.  

Hi everyone, I want to ask about the LIS12DH threshold calculation (attached with what I think the calculation is), it is clear that when I use 4g as the scale, my calculation results are 2.5g, when I move the sensor can go above this threshold and trigger an interrupt, I only configured the Z-axis, so I am just simulating a falling motion, but when I use 16g as the threshold, I can only configure the Z-axis. I need to adjust to 6, according to the same calculation method, 6*16/255=0.376g, this time I move in the same way, only barely trigger the motion, why? Is it related to the frequency I set? Because when adjusting the threshold, I also adjusted the frequency (100hz->4g, 25hz->16g), thank you very much for someone to answer for me! Oh, I almost forgot. I've turned on the high-pass filter

Hello,      on a custom board which mounts STM32F407 CPU with LSM6DSV16XTR accelerometer+gyroscope and LIS2MDLTR magnetometer I have to implement an inclinometer and a eCompass with the maximum accuracy. Now, it is not completely clear to me how to get the most accurate inclination an eCompass information since there are a lot of possibilities. Is the MotionFx the definitive solution or it is better to use MotionTL and MotionEc or maybe a combination of these? Moreover on a previous board based on the LSM303AGR I made a 6 points factory calibration, the correction matrix was evaluated off-line stored on flash and applied on each measurement. This increased the accuracy to the desired values.  According to documentation MotionTL has this feature (I don't know if the library performs the evaluation of the compensation matrix). Is the 6 point calibration available also with MotionFx in some way? Here the documentation focuses mainly on magnetometer calibration and

I am using STM32L496ZG nucleo board for interface MEMS MPL3115A2 Sensor using I2C interface . First i am scanning I2C device and find attached device too.But after scanning device whenever i tried to read Who am i register , i don't receive correct data and receive 0X00 instead of register value.Datasheet for breakout board -https://cdn-shop.adafruit.com/datasheets/1893_datasheet.pdfCode for Scanning device and read Who am i register using STM32Cubeide./*define--------------------------------------*//*Scan device----------------------------*//*Read who am i register--------------*/And this is settings to configure I2C in STM32cubMX.This Sensor breakout board is working with other controllers finely ,But not with this STM32 board .Please help me out from this . Is there any changes need to do in Hardware or in configuration?

Hi BenG142, I'm trying to develop a pedometer application using the LSM6DSOX sensor, but I haven't been successful. Could you share your project files with me? I'd like to know which registers you used. 

Hi, I look on different application notes linked to the LPS27HHTW but I found nothing about its failure mode.I want to know what could be its failure mode and how will it react for eg on SPI communication (value at 0 or minimum or sea level pressure?) Thanks for your help     

Hello,we're considering to use ASM330LHB in the SIL2 functional safety application and we would like to use and take credit from ST's ASILB-LIBRARY. However ASILB-LIBRARY use-case as it's documented expects that two redundant senors will be employed. Can be ASILB-LIBRARY used only with single IMU source? Thank you for the answer and support@Denise SANFILIPPO thank you for your awesome article on this topic https://community.st.com/t5/mems-and-sensors/how-to-augment-your-automotive-safety-applications-with-the-imu/ta-p/670346 

Posted on September 08, 2015 at 14:18Dear All,I am writing a firmware that is supposed to detect if a body is moved for a certain time i.e. 3 seconds of continuous motion. I am using LIS3DH Accelerometer sensor. Here is the configuration registers values:CTRL_REG1 = 0x2F          //Enable all axes + ODR = 10 HzCTRL_REG2 = 0x00          //DefaultCTRL_REG3 = 0x40          //Enable AO1 interrupt on INT1CTRL_REG4 = 0xB0          //16G full scaleCTRL_REG5  = 0x00          //DefaultCTRL_REG6 = 0x00          //DefaultINT1_CFG = 0x7F         //6D movement recognetionINT1_THS = 0x02         //Note FS = 16G. (Sensitivity = 0.25G)INT1_DURATION = 0x1E         //0x1E = 30. Note ODR = 10 Hz. (Threshold = 3 Sec)What I got is that if the body is moved for time less than 3 seconds

Hello, I have as project to use the STWINKT1B board and write my custom code to read IMP23ABSU sensor at its maximum capacity (80kHz). I understand the sensor output data is amplified by an op-amp and can be read with ADC input of the microcontroller, but what is the exact interface ? I don't really understand the schematics logic of the sensor (Why is there 2 ouputs: "MREF" and "M1P_FILT", why are 2 op-amps used)Could you please give me more details ?Then, is there some basic examples of how to read the sensor ? ADC input configuration, sensor configuration, reading...Thank you

Hi! In the Linux, I want to use buffer mode with st_lsm6dsx driver.But there isn't file /sys/bus/iio/devices/iio\:deviceX/buffer/enable. Why?The chip used is LSM330DLC, linux kernel version is 6.1.55 in nxp's yocto. ■log1(there isn't buffer directory)root@XXX:~# ls /sys/bus/iio/devices/iio\:device0/current_timestamp_clock in_anglvel_scale_available in_anglvel_y_raw name power sampling_frequency_available ueventin_anglvel_scale in_anglvel_x_raw in_anglvel_z_raw of_node sampling_frequency subsystem waiting_for_supplierroot@XXX:~# ls /sys/bus/iio/devices/iio\:device1/current_timestamp_clock in_accel_scale in_accel_y_raw name sampling_frequency ueventdev in_accel_scale_available in_accel_z_raw of_node sampling_frequency_available waiting_for_supplierevents in_accel_x_raw mount_matrix power subsystem■log2(latest value can be obtained)root@XXX:~# cat /sys/bus/iio/devices/iio\:device0/in_anglvel_x_raw64■ device tree&i2c3 {(omit...)imu@6a {compatible = "st,ism330dlc";reg = &

Hello,I am working on migrating from the LSM6DSO32 to the LSM6DSV32X for my application.  My primary interest in the newer part is the increased gyro range to 4000dps.  I am trying to keep the operation of the device similar to what I am using now.Some of the operating modes have changed and I have a couple of questions.The gyroscope no longer has a "Normal" mode.  Is "Low Power" mode the next best option to use?  If not, which is?The accelerometer no longer has "Ultra Low Power (ULP)" mode.  It appears the lowest power option available is LPM1.  Is this correct?  Also, throughout the datasheet, LPM1 is noted as "2 mean."  Can this be explained more?  Does this factor into the decision of what data rate I need to select (for example if I was using 12.5 Hz previously, would choosing 15 Hz yield the closest performance or would I have to choose double that to account for some sort of filtering?)

Hello everyone,I am currently developing an IMU array application using the ASM330LHHXG1 sensor and am trying to streamline my interrupt management. This sensor has two interrupt pins, and I am contemplating whether to use both pins or just one. My primary concern is with the Data Ready (DRDY) signal, which indicates when new data from both the accelerometer and gyroscope are available.Does anyone know if the DRDY signal from this sensor is synchronized for both accelerometer and gyroscope data? In other words, does one DRDY signal mean that both sets of data are ready to be read simultaneously? Additionally, I’m considering whether to assign each sensor type (gyroscope and accelerometer) to a separate interrupt pin or to use one pin for both.Could using two separate interrupts improve performance in any way, or would it be overkill for standard motion detection and tracking applications?Any insights or experiences shared would be greatly appreciated!Thank you in advance!

I recently bought the STEVAL-MKI245KA, consisting of an ad hoc PCB mounting the ISM330BX 6-axis IMU, which is connected through flat cable to a generic adapter board (STEVAL-MKIGI06A). I am trying to enable I2C commincation between the adapter board and an Arduino Mega, however, even after I connect the pins according to the datasheet of the components, when I run an I2C scanner on the Arduino, there are no devices detected. Here are my pin connections:  Adapter BoardArduino1VDD3.3V2GNDGND3SCLSCL4SDASDA5CS - VDDIO 6SDO3.3VThe adapter board is mounted on a DIL 24 pin socket, which is then placed on a breadboard.What am I doing wrong? I want to read and use the IMU readings, any suggestions on how I can do this any other way?

Hi All, We are using an Activity Monitor (LSM6DSOX) interfaced via I2C with the ATSAMD51J20A microcontroller. We have configured the device for single tap and double tap detection using the AN5272 configuration. We tested each configuration individually, and they are working fine. However, when we integrate both single and double tap detection, tapping the device twice triggers both the single tap and double tap interrupts. Could you please let us know if there's anything we missed in the configuration? Thanks and Regards GD