MEMS (sensors)

Hello STM32 community,I've been examining the lsm303agr.h file from STMicroelectronics for the LSM303AGR accelerometer, and I came across something puzzling in line 197. In the code, it defines LSM303AGR_ACC_SENSITIVITY_2G as ((uint8_t)1), but according to the LSM303AGR datasheet, the linear acceleration sensitivity at ±2 g in normal mode is 3.9mg/LSB.Could someone help me understand why there's a discrepancy between the code definition and the datasheet specifications? I'm curious about the reasoning behind this difference and how it might impact the usage of the accelerometer in my project.Thank you in advance for any insights you can provide!

The silk screen of LIS2DLC12TR is the same as LIS2DS12TR, but the specific information and parameters of LIS2DLC12TR cannot be found

I modified this IIS3DWB example to use IIS3DWB on my nRF board.This example set the size of watermark as 256,and in the while loop, the data will be retrieved when FIFO_WTM_IA is triggered. In my program, it seems that I can get the correct accel data, but the value of num is not as I expected.The value of num is 256 in the first loop, and is always 512 after the second loop.      while (1) { uint16_t num = 0, k; /* Read watermark flag */ iis3dwb_fifo_status_get(&dev_ctx, &fifo_status); if (fifo_status.fifo_th == 1) { num = fifo_status.fifo_level; /** other code **/ } /** other code **/ }   I'

Hi,I am trying to perform a 6-point tumble calibration for my LSM9DS1 accelerometer. The returned output data from the MotionAC_Update is always as follows:The "is_calibrated" parameter is always 0, indicating the accelerometer is not calibrated.The initialization is done the following way:void cal_init(MAC_output_t start_accel_bias){ /*** Initialization ***/ char lib_version[VERSION_STR_LENG]; MAC_knobs_t Knobs; /* Accelerometer calibration API initialization function */ uint8_t enable = 1; MotionAC_Initialize(enable); MotionAC_GetKnobs(&Knobs); Knobs.Run6PointCal = 1; Knobs.Sample_ms = REPORT_IN

We have received LIS2DS12TR, but we cannot identify the Marking of the Part.On the part there is a QR-Code and a "G". Could you please confirm that this is LIS2DS12TR and what the QR Code is standing for. Thank you in advance

Hi all,I have a question regarding the LSM6DSL's gyroscope high-pass filter configuration.For LSM6DS3, there is an option to reset the high-pass with HP_G_RST = 1. This way, the DC component of the angular velocity is immediately removed, c.f. https://community.st.com/ysqtg83639/attachments/ysqtg83639/mems-sensors-forum/21052/2/AN4650.PDF, figure 5, page 26.How can I achieve the same with the LSM6DSL? According to the datasheet and application notes (https://www.st.com/resource/en/application_note/an5040-lsm6dsl-alwayson-3d-accelerometer-and-3d-gyroscope-stmicroelectronics.pdf) there is

Good morning,I work actualy with the LIS344LH accelererometer and I was informed it will not be available anymore.Do you know any other devices that would substituate it ? I need it for measuring the movement of a tuning fork with a resonnance frequency of 1.8kHz.Thank you everyone :)

Do you know the following characteristics (typical values or reference value) on the accelerometer of LSM6DS3H :  Bias reproducibility ?

Hello ST Community!Please help with resolving issue with WHO_AM_I register!Firmware that I'm using on MKI109V3 board is V3.65.5. 

since LPS22HH support one byte read or multiple byte read. wonder how LPS22HH handles the last bit on I3C because last bit in Read data is 'T', rather than ACK/NACK from I3C Controller. How does LPS22HH (target) know Controller need single or mulitple byte read. 

Hello, I am currently running the MEMSMIC1 audio streaming example via usb with 4 channels and it works fine, but Because i am using the nucleo-wb55 board that has a pdm interface supporting up to 3 microphone pairs I want to use as many microphones as possible.Which specific files in the memsmic1 project do i need to adjust to support the streaming of 6 microphones?

Hello everyoneI need to have the pspice model of LIS344ALH (i know that this product is not longer available)I try do it with the datasheet but i don't have enought infoCan someone help with it ? :)Thanks ;)

I am working on PDM microphone with STM32L476RG using DFSDM peripheral. I need to know how to get the live data streaming audio output data from stm32 and want to save as .csv.

hello,     i'm working on ASM330LHH IMU sensor, here raw value is continuously fluctuating even sensor is in untouch condition(fluctuation is between -1 to 6). is it possible to make it zero? so how can i stop this fluctuation. plz share suggetions or method.

Hi,I have attempted to follow the AN5201 application note page 26 to configure the IIS2DLPC accelerometer to generate an interrupt at every threshold however this interrupt is never generated. I have tried to print the value of SIXD_SRC register and that is always reporting 0 so I assume that's the reason for not generating an interrupt? Below is the configuration I used, I have also tried to latch the interrupt but even that didn't help so I commented it. If I read the OUTPUT registers I am able to see the correct data and see the thresholds being reachedI would appreciate any help.Kind RegardsManpreet SinghAcc_handler.cntrl_reg.CTRL1_value = 0x64; //ODR = 200 Hz, high-performance//Acc_handler.cntrl_reg.CTRL3_value = 0x10; //Latched mode -> interrupt is active until SIXD_SRC is not readAcc_handler.cntrl_reg.CTRL4_value = 0x80; //Route 6D interrupt bit to INT1Acc_handler.cntrl_reg.CT

Hello,I am working with the IIS3DWB for a vibration monitoring sensor, and have a few questions about the ODR (Output Data Rate) accuracy, hoping someone can help me.1. I know that on the datasheet the ODR accuracy is stated as +-1% typ, or +-2% Max.I want to know, does this accuracy specification include using the INTERNAL_FREQ_FINE register to correct the ODR (See page 45)? If we use the contents of that register is the tolerance considered more accurate?2. I am also curious if anyone knows the INTERNAL_FREQ_FINE register is set once in manufacture, or if the contents change over time. Should I read this register once or read it regularly to update my data rate correction.2.a. I know there is also a characteristic to describe the ODR change with respect to temperature. Is this characteristic captured in the adjustment provided by the INTERNAL_FREQ_FINE register? Or would it be beneficial for me to apply this correction in post processing?

Hi,I want to run an application for a week. This video says the battery life is 10 hours:https://youtu.be/gFkIcrUkP5w?t=452s Question:Can I use an external power supply like this and set it to 5v:https://www.adafruit.com/product/4880 Connect it's barrel jack to this barrel jack to USB C adapter:https://www.adafruit.com/product/4536 and plug it into the USB C port on the SensorTile.box Pro?Thanks,Bill

Hi,I have a Sensortile .Box Pro board and I plugged a H3LIS331DL high range accelerometer on its top socket.Is there any available code to log data from H3LIS331DL? I thought all MEMS evaulation boards from ST (STEVAL-MKI153V1 in this case) were supported.Regards

Hi,I am trying to calculate the MTBF (mean time between failures) value for the ASM330LHHTR module. Please suggest any techniques for the same. I am currently using the Qjc (Junction to Case Thermal Resistance) and Pd (Power Dissipation) values to calculate the same.Please provide the Qjc value for ASM330LHHTR at 35 degrees Celsius or suggest another appropriate method to calculate the MTBF value for the same. Thanks,OF

Hi ST Community,I currently have FSM and an MLC .ucf files. I have followed the instructions in DT0147 "Advanced design tips for the machine learning core and finite state machine using Unico-GUI", and have attempted to merge the FSM and MLC files into one .ucf for use in our product. Unfortunately, when I uploaded the new .ucf file, I noticed that neither the FSM, nor the MLC portions were working.Looking into the merged .ucf file, I noticed that the very beginning does not start like the rest of the .ucf files I have created in the past, namely the turning off of the accelerometer and gyroscope and entering the embedded function mode. Below is the first few lines of the Merged.ucf:Ac 09 64Ac 09 04Ac 02 41Ac 08 64Ac 02 41Ac 08 66Ac 02 41Ac 08 67Ac 02 41Ac 08 69Ac 02 41Ac 08 6AAc 02 41Ac 08 6CAc 02 41Ac 08 6DI have also attached the entire file in case it is needed (

Hello, I am using a LSM303AGR sensor. I am several questions about the datasheet. ------------------------------------------------------------------------------------------------------------------------------------------Firstly, I don't understand why the linear acceleration sensitivity in table 3 Sensor characteristics has a value of 11.72 mg/LSB for +-16g in high resolution (HR) mode.In HR mode : n = 12 bits. So +/-16g => range : 32g Sensitivity = Range / 2^n = 32 / 4096 = 7.8125 mg/LSB  In the datasheet you give 11.72mg/LSB... (48/2^12 = 11.72mg/LSB but why 24 * 2 ?)My calculations are good with your result from Table 3 for each mode and for each full-scale EXCEPT for +/-16g. I think +/-24g has been used for you Table 3 but I don't know why... ----------------------------------------------------------------------------------------------------------------------------------------- Secondly, in table 96,

I'm using Hypsometric formula to Calculate Altitude by using Pressure & Temperature. ( Source Code used to read the sensor https://github.com/stm32duino/LPS22HB )The Pressure value & Temperature are not in Sync.. Temperature Increases irrespective of Air temperature, which in turn causes wrong altitude value. When Move upside Pressure & temp should decrease.. But only pressure decrease & temp remain same or increase. What is the best way to calculate Altitude ?How to do OPC ?? Thanks In Advance.

Hello, I am trying to use the MEMSMIC1 example on my nucleo-wb55 board, specifically the microphones streaming exampe to record sounds with audacity. I am able to compile and run the code. I am also able to see the microphone show up in the device manager, and can select it from recording options in audacity, but it does not detect any sound.Could there be a reason for this other than an issue with the microphones? I have already tried two different microphones and both dont record although they are recognised by the computer

Hi,I'm trying to solve dead-reckoning over small distances and durations (few centimeters to few meters, over 2s to 20s approx. each time). After reading a lot of documentation ad publications, this seems pretty doable over small distances because the drift doesn't accumulate too much.I have a LSM6DSV16B IMU sensor, use the SFLP block to compensate for gravity and gyroscope bias, then I filter and integrate the accelerometer data twice to estimate distance made (with speed reset after movement to remove integration error). At this point I'm not even trying to plot a trajectory, but just estimate an absolute distance made during a movement.To test setup consists of a 1m long rail with small tilt, and an optical sensor measuring displacement (100Hz sampling) to compare the results. The sensor is placed on an object hanging from that rail, and dropped without initial speed. Sampling of accelerometer, gyroscope and SFLP, along with FIFO batching, are all done at 240

Evaluating the use of LSM6DSV32X + external magnetometer in sensor hub mode to achieve 9Dof. Is there a list of compatible magnetometers that should be used for this setup to work? Also is there  a pass through mode where we could talk directly to the magnetometer/external sensor through LSM6DSV32X.