MEMS (sensors)

The microcontroller acquires data via SPI communication with the accelerometer. What is the risk if the data update timing of the accelerometer and the data acquisition timing of the microcontroller overlap?

We are operating ASM330LHH with ODR set at 3333Hz, but the actual measured output is about 3570Hz.This is not stated in the specifications, but is this within the range of the specifications?

 Dear sirs. I'm connecting an ISM330DHCX with an IIS2MDC and I need to know if the connections scheme is okay to operate in MODE 2Then I need to know if pullups are needed for i2c bus coming from SCx and SDx, and if pulldowns are required for INT lines as in the provided schematic.I'm based on the ISM330DHCX and IIS2MDC datasheets and X-NUCLEO-IKS02A1 board manualThe routing jumpers are there just in case we need to route one magnetometer to tha main I2C bus Thanks in advanceIgnacio

Hello,My goal is to test the IBI functionality of my custom I3C master driver using the LSM6DSOX sensor. For this test, I need the Linux I3C slave driver for LSM6DSOX with IBI support. The file linux/driver/iio/imu/st_lsm6dx/st_lsm6dsx_core.c does not contain any IBI-related code, such as i3c_device_request_ibi. If anyone has an example or code for using IBI with I3C in a Linux environment, could you please share it?. 

Hi all,I am trying to get started with a LSM6DSV320X accelerometer, using a STEVAL-MKI251A and a Raspberry Pi 4. I can get raw Accelerometer and Gyroscope data from their dedicated output registers (0x22h to 0x2D), but when I try to use the FIFO, I can't get it to work - I get data with tags that are not enabled, with tags that don't exist, and when there's a tag with Accelerometer data, it's incorrect. I've also tried writing the special functions registers to make sure the special functions are disabled and there's nothing of that batched into the FIFO, just to make sure, but that didn't make any change. Currently I've reduced it to as simple a configuration as possible and removed all other code from the test program, and I'm using the following configuration:Read WHO_AM_I register - get 0x73Configure FIFO:Write 0x01 to CTRL3 (software reset)Write 0x44 to CTRL3 (Enable BDU, auto-increment)Write 0x04 to CTRL1 (Acc high performance

Hello,I'm using MEMS Studio to log data from a multi-sensor glasses platform for biomarker extraction research. My sensor configuration includes:ST1VAFE6AX (Accelerometer @ 240 Hz, Gyroscope @ 240 Hz, vAFE enabled)LIS2MDL (Magnetometer)LPS22DF (Pressure)STTS22H (Temperature)The CSV export includes a new_data column containing hex values (e.g., 0x08, 0x10, 0x18, 0x20, 0x400). I understand this is a bitmask indicating which sensor(s) have new data in each row, but I cannot find official documentation for the bit assignments.Through empirical analysis (checking which sensor columns actually change when each bit is set), I determined:Bit Mask Sensor CorrelationBit 30x08Accelerometer96.6%Bit 40x10Gyroscope96.6%B

Hi,We've been working on a project using v1.3.1 of MEMS Studio, but I've had to use a new laptop and it doesn't have this installed. Unfortunately, when I go to the downloads page I can only see v1.4.1 of MEMS Studio and it's forcing me to upgrade the firmware, which I don't want to do as all our testing & benchmarking has been based on a specific configuration.Does anyone have, or can you point me to, the older version of the application? ST don't seem to have an archive of older builds anywhere and their support team has been unable to help.Thanks,Simon

Hi,I can't find a way to select in MEMS Studio which MLC filters are passed FIFO and how to enalbe MLC result in FIFO.Configuration created by MEMS studio enabled MLC_FILTER_FEATURE_FIFO_EN in EMB_FUNC_FIFO_EN so I see selected MLC features in FIFO but nothing more - no filters, no results.I manually enabled MLC_FIFO_EN but MLC results didn't appear in FIFO.I tried to enable filters manually in mlc.json by adding "fifo": "true" to filters in json file, but it didn't help.  I've attached MLC files. Best regardsTomasz 

Hello, I am trying to record audio with external digital PDM microphones using the MEMSMIC1 example but it is not so straightforward without the nucleo expansion board. Because the CCA02M1 has a direct connection to the pc it is able to be detected as a microphone in the device manager, it is easily used through audacity. How can I implement this project and use audacity with my microphone setup if they are directly connected only to the development board (I am using nucleo-wb55rg)?

I have previously used a large quantity of LSM6DSV16XTR products from batch 426, and their data was completely normal. My device utilizes 16 gyroscopes simultaneously. Recently, I started using products from batch 509, and they have exhibited a peculiar phenomenon. Specifically, it includes two parts: (1) When the temperature slowly increases from -40°C to 85°C, observing the data of a gyroscope at rest, some gyroscopes show data jumps at certain temperature points (the jump temperature point varies for each gyroscope). For example, the data may jump from -0.98°/s to -0.08°/s. (2) For the same gyroscope, at the same temperature, the bias data varies significantly at different times. This phenomenon does not occur in every gyroscope, but it greatly troubles me because I cannot record and compensate for the bias data in the temperature chamber, as these biases have become highly irregular. This phenomenon did not occur in batch 426. Does anyone know why this is happening?

Hi,I've tried to use high-pass filter in MLC in MEMS Studio, but the results are incorrect for first windows in each data file. I found that result is different from the one from Unico, but probably because Unico just drops first 2 windows from each file (which is an error itself). Signal is a quite constant noise (sample data and project is attached). These are F2_MEAN_ACC_Z_FILTER_1 & F3_MEAN_ACC_V_FILTER_2 from MEMS Studio and Unico. Decision tree generated based on these filters makes no sense. Values of these features read from FIFO looks ok. Looks like a bug in the a

I need to save power in a project; the system will turn on when shaken. I need to configure INT1 pin to leave the LDO open for 15-20 seconds. Conditions:1- Did the device move? (acceleration)2- Are the x, y, and z axes in the correct position?If conditions 1 and 2 are met, set INT1 high for 15 seconds.Is this possible? Are there any documents available on how to use int1 and int2?

Hello ST Community,Based on a photo found on the internet of the LIS3DH chip and a comparison with the package information in the datasheet, I found a discrepancy in the footprint.The datasheet appears to show the pin-1 mark on the opposite side compared to the photo. I also found differences between two different online libraries that you recommend on your website.I am pretty sure that the correct position is as shown in the photo or in the Ultra Librarian library, but could you please clarify the correct location of the pin-1 mark, both on the top of the IC and on the bottom of the IC?Many thanks.Internet Photo:

Hi Sir,1. Regarding Initialization (Absolute Orientation)In my application, I need to obtain an absolute orientation (Roll, Pitch, and Yaw) relative to the Earth's frame. Is my understanding correct that the Initial Quaternion must be computed using both Accelerometer and Magnetometer data (as per DT0058 Step 4) to establish the starting reference?Since the gyroscope only measures angular rates, is it true that a 6-axis (Acc+Gyro) initialization alone cannot provide an absolute Yaw/Heading reference?2. Regarding DT0060 Step 2 I would like to confirm the definitions and implementation of the mixing process:Q1 Definition: Is Q1 the "dynamic quaternion" that is updated via gyroscope integration in Step 1?Q2 Definition: Is Q2 the "reference quaternion" calculated from the accelerometer and magnetometer data, used to correct the drift of Q1?Weighting Parameter (alpha): For a handheld device, what is the recommended range for the alpha parameter in the form

Hello, I'm trying to use ODR-triggered to get data aligned with my clock. I'm sending a square wave 50% duty cycle period 2000ms over INT2 pin, yet when I poll the IMU every 50 ms the accel and gyro data changes, even though it should be aligned to the edges every 1000 ms.I've double checked the registers to confirm they are correct and have an analyzer attached to verify INT2 pin is being sent signals. // init.c lsm6dsv320x_block_data_update_set(&data->ctx, PROPERTY_ENABLE); lsm6dsv320x_xl_data_rate_set(&data->ctx, LSM6DSV320X_ODR_OFF); lsm6dsv320x_gy_data_rate_set(&data->ctx, LSM6DSV320X_ODR_OFF); lsm6dsv320x_xl_mode_set(&data->ctx, LSM6DSV320X_XL_ODR_TRIGGERED_MD); lsm6dsv320x_gy_mode_set(&data->ctx, LSM6DSV320X_GY_ODR_TRIGGERED_MD); lsm6dsv320x_xl_full_scale_set(&data->ctx, LSM6DSV320X_2g); lsm6dsv320x_gy_full_scale_set(&data->ctx, LSM6DSV320X_2000dps); lsm6dsv320x_xl_d

I am trying to use some machine vibration data to identify running condition. In my use case, i was able to create decision tree and configuration file in sensor with MEMS studio 2.2.0, but the sensor is not detecting any decision tree information.the decision tree information is stuck at 0x00.my decision tree label value:      1 ---> not running ( no accel vibration detection)     4 ---> running What could cause the LSM6DSV16X sensor to provide no data in the decision tree?feature.arff file few lines: using acc_v and gyr_v information.@relation 'MLC'@attribute F1_VARIANCE_ACC_V numeric@attribute F2_VARIANCE_GYR_V numeric 

Hi everyone,I'm using 2 LIS2DU12 on one object.The first one is configured in continuous mode. I forward the samples directly to a computer. I use it to check the wake up triggering configuration of the second one.The second one is configured in continuous-to-FIFO mode. And I'm trying to get it to wake up when the acceleration on one axis is over 2g for at least 8.75ms. ODR is 800Hz, FS=16g, so I set :WK_THS=8WAKE_THS_W=0=> threshold = 2g x 2⁶ / 16g = 8WAKE_DUR=01 (7 ODR_time)WU_DUR_X4=1=> Wake-up duration = 7 / 800 = 8.75msThe first LIS2DU12 configured in continuous mode shows that during my tests I get 4g for over 20ms, yet the second LIS2DU12 does not wake up. But if I set the threshold to 4 (i.e. 1g according to my calculations) it does wake up, and I recover 2 very similar acquisitions.What did I misunderstand ?Here is a code snippet of the configuration of the LIS2DU12 in continuous-to-FIFO m

Hello Team,We are using SensorTile.box Pro with the STEVAL-MKI251A (LSM6DSV320X) adapter board and MEMS Studio version 2.2.0. Flashed the sensor tile box pro with the DataLogExtended.bin firmware which is available in the MEMS StudioWe have logged accelerometer Low-G and High-G data at 1.9 kHz. Additionally, we enabled and monitored interrupts from INT1 to INT10 during the test.We observed that only INT10 shows an output value of 1, while all other interrupts remain inactive.Could you please confirm from your side whether INT10 = 1 corresponds to the Free-Fall interrupt for this sensor configuration? Also, kindly let us know if this behavior is expected when using MEMS Studio 2.2.0 with SensorTile.box Pro and the STEVAL-MKI251A.Thank you for your support.Best regards,Ahilesh

Do you consider this as aDo you consider this a crack?

Problem description:We are seeing a hard I2C bus lockup involving an ISM330 IMU and an IIS2MDC magnetometer on the same bus. The failure mode is that SDA is driven low permanently, and the bus cannot be recovered by standard I2C recovery procedures (9–20 SCL pulses with SDA released). This occurs both immediately after MCU firmware is flashed and during nominal runtime, seemingly at random. Once the condition occurs, a full MCU reset does not recover the bus. On a bench setup we confirmed by probing that SDA is physically held low. Hardware configuration:MCU: STM32 acting as I2C masterDevices on bus:ISM330 (IMU)IIS2MDC (magnetometer)These are the only slaves on the bus.Standard I2C pull-ups are used,

Hi Everyone,I'm currently migrating from LSM6DSM to LSM6DSO in my application and facing some issues with accelerometer accuracy in stable conditions.System Overview:MCU: STM32L4Sensor Interface: SPI (3-wire)Purpose: Reading raw accelerometer and gyroscope data, converting to physical units, and estimating roll/pitch/yaw using MotionFX.Configuration Details:   Parameter Value Acc/Gyro ODR1.6 kHzFIFO Output Rate400 HzMain Loop Rate100 HzAveraging4 samples/frame What’s Working:

Hi community,I am working with STM32H747I-DISCO Board(Dual cortex M7+M4)MP34DT05-A digital MEMS microphone is integrated on the board and issues are facing while bringup.Issues follows:As per the schematic there is one digital microphone connected to the MCU using SAI Interface with default connectionsI am trying to bringup it with the help of refernce document(Ref AN5027).When i am understnading this document a few questions have been raised. Those question as follows.1.There are two types of mode  mono modestereo mode       

I'm using a STEVAL-MKI109D with the IR sensor STHS34PF80 and I need to fine tune it to detect objects with low IR emissivity, but everytime I want to load the log file into the IR Algorithm Tuning, the same error appears "Failed to parse log file". I've tried modifiying different things from the log, but everytime, I get the same error. Here is an example of a log file:# STEVAL-MKI231KA (STHS34PF80)time[us],t_object[LSB],t_object_comp[LSB],t_ambient[C],t_ambient_shock[LSB],t_ambient[LSB],t_ambient_shock_flag,motion[LSB],presence[LSB],presence_flag,int_1638,-614,-614,23.470,0,2347,0,0,0,0,0638,-671,-671,23.540,0,2354,0,0,0,0,0729188,-641,-641,23.490,5,2349,0,0,0,0,01736289,-659,-659,23.440,9,2344,0,15

Hello, I have bought an ISM330BX | Product - STMicroelectronics and a STEVAL-MKI109D | Product - STMicroelectronics. I can get it to stream data by using: *setdb245ka *zoff *gw1009 *gw1109 *startOR*debug For debug this streams something like:AX = -7303 AY = -4734 AZ =-13823GX = -429 GY = +271 GZ = +358QVAR =  +0 QVAR_FILTERED =  +0 For start, it is binary and i can co

Hi,everyone.I measured the power consumption of LIS2MDLTR on the same board in power-down mode.and found that the LIS2MDL chip on STEVAL-MKI217V1(from mouser) consumes less power than the LIS2MDL purchased separately from mouser.We have some question and need your help.​ What is the power consumption LIS2MDL in power-down mode ？  Why do the parameter differ between LIS2MDL chip on STEVAL-MKI217V1 and LIS2MDL purchased separately？