MEMS (sensors)

I'm having problems to be able to establish the connection between STEVAL STWINBX1 and ST MEMS Studio software, with either of the two available ways (BLE or Serial port). In the first case, mainly the board won't be shown to select. In case it does, after trying to connect it, an error message appears: "Can't open the board". In  the second case, the board always appears to be selected but once I try it, an error message is shown which says "Board not identified". I'm not able to connect it no matter what I try. As said in the user manual relative to the software, this board can only work for the AlgoBuilder functionality, not for a full or partial sensor evaluation. It has to be said that the board works perfectly through BLE on the IOS App. Am I missing something? Sound strange to me. Maybe is just non-compatible or maybe it's a firmware issue (which I think it's not the case). Any suggestion will be very helpful.

I searched all available documentation, community and haven't found answer.AN5983 says nothing about motion and presence units.Code base (https://github.com/STMicroelectronics/sths34pf80-pid) and datasheet also say nothing about motion and presence units.I just would like to know, whether register values TPRESENCE_L(3Ah), TPRESENCE_H(3Bh), TMOTION_L(3Ch) and TMOTION_H(3Dh) correspond to any physical units like. mm, cm, inch, etc?Am I able to get distance from object to sensor?

Hello,I have been battling with getting an LSM303AGR to pass the self test. The accelerometer is passing the self test and the values look reasonable (Z-axis ~1g), but the magnetometer will not pass. I have 2 STEVAL-MKI172V1 boards, both are showing the same symptoms. I am testing with a Nucleo-U5A5ZJ-Q with I2C at fast mode (400KHz).Initially, I wrote my own self test based on the procedures in the datasheet (Version 11.0, Aug 2022). I was able to get the accelerometer to pass, but not the magnetometer. After debugging ad infinitum, I decided to try using the test provided from the STMems_Standard_C_driver repo contained in lsm303agr_self_test.c. I found a few posts here and this was what everyone was directed to.It is worth noting there are several bugs in this test: using uninitialized data, using previous data from the accelerometer test for the mag test without clearing, etc. Once I had these bugs sorted, I reran the tests to get the exact same outcome I was getting from

Hi,does someone know the diffenences between MP34DT05 and MP34DT05-A?The MP34DT05 is not in prodiction. Cant find other differences, what does the -A means?Thanks for helping me out.

Accroding to https://community.st.com/t5/mems-and-sensors/how-lsm6dsv16x-enables-sensor-fusion-low-power-sflp-algorithm/ta-p/585084LSM6DSV also have SFLP, do it change the factory calibration values? and which registers will be changed?

I am using an imu sensor ( ism330dhcx ) which I am working on to accelerometer and gyroscope data and I get the raw data from ims330dhcx and convert the raw data into actual angles by using the motionFX library. Still, there is some deviation between the imu sensor ( ism330dhcx ) and the standard reference device, so I need to calibrate the data for the standard output angle. so, please let me know if there is any software application tool to calibrate the imu sensor to the standard angle.

I designed a card that uses Stm32f446 and many sensors, but although the other sensor on the I2C line works, I cannot even get an I2C OK response from the LSM6SDL. I don't think there is a mistake in the design, but I am sharing it with you anyway, thank you in advance for your help. 

Hi everyone, Building a predictive maintenance device with a MEMS accelerometer. Using STEVAL-STWINKT1B as reference, but missing Altium design files. Anyone have them to share? Thanks!

Last year it was in STM32CubeIDE under X-CUBE-MEMS1... now it's no longer there. The only board extensions are IKS01A3, IKS02A1 and IKS4A1. What about IKS01A2?Pietro

Hi,I am working on a project to detect human presence. While testing I found that the TMOS sensor latches to a hot/cold body nearby and fails to detect humans. My measuring distance is only 6" - 10". Below is the debug of the issue I am facing with hot water. I have tested it with multiple permutations of ODR, AVG_TAMB, AVG_TMOS. I face the same issue in every scenario. The latching problem remains the same with cold water.  Ideally, the tpresence should come back to zero after the hot or cold object has been removed from FOV, but the sensor continues to stay on the new value (i.e. 1000) and treats it as the new normal. Please suggest what mechanism can be used to mitigate this problem.  Regards,Lovelesh Patel

I am a bit confused about changing the Gyroscope Full-Scale range during operation (dynamically).  Do I only need to change register CTRL2_G, or anything else too, to trigger a change to the Full-Scale range? What happens once I change the sensitivity? Lets say I sample the value sitting in the Gyroscope. Then I change the sensitivity. Will the next value from the gyroscope be based on the new sensitivity? Putting aside the settling time associated with changing sensitivity. How long before the new sensitivity takes effect? Is the next sample at the new sensitivity, or if that sample has already started conversion will it be the sample after that? If there is a time to take effect, how can I make this time to take effect consistent?     

If I am trying to use INT1 to indicate a "data-ready" event, does that result in a Low to High transition on the INT1 pin? Or a High to Low transition on the INT1 pin?  Does the line stay high indefinitely, until the data is read? What happens when new data overwrites the old data? Does the INT1 line change state, and then back again?   

Hi all,I'm trying to use the LIS3DH to detect if the object is in a non-safe position, i.e. standing on a slope (tilted) or in the upside down position and generates an interrupt if it's one of these. Setup:Y-axis pointing downwards in the stable position (y-axis reads +1G)ZH & XH whenever the threshold exceeds 480 mg for longer than 0.5 secondsODR on 100 HzRange +- 2gLPM enabledI've tried the postition detection function for this, but to my experience this only generates an interrupt when it's mostly in the known axis regardless of the set threshold. Maybe I've misinterpreted the datasheet.For now I've got the tilt interrupt working, but whenever I want to detect upside down it generates an interrupt when it's in the stable position. I know this is due to the inertial interrupt triggering whenever the absolute value of the axis is above the threshold, so gravity triggers this interrupt. I'd rather have the remaining interrupt detect a free-fall so I want all of this in t

How consistent is the LSM6 sampling clock? I didn't see any details regarding clock variation at different temperatures, etc in the manual. However, I may have missed it. 

Hi,I have been working on interfacing a Ds18b20 sensor with STM32wb55 development board using CubeIDE version 1.5.0. I am using the code provided by controller's tech website following their instructions. The link for the code can be found below. https://controllerstech.com/ds18b20-and-stm32/The microsecond delay function did not work with the board. Therefore, I have implemented and checked the below code and is working fine (It was checked with the oscilloscope). According to the datasheet, for the initialization of the sensor, the data pin is pulled low from the high state (for at least 480 us) and released by making it a NOPULL input. Therefore the voltage goes high as the data pin is pulled up by a 4.7k resistor. If the conditions are correct, the sensor would sense the rising pulse and must pull the data pin low for reset within 15-60us. I have tried several methods to evaluate the sensor response but no luck so far. The problem persists in all the approaches I hav

There are two parameters "Speed" and "Acceleration Peak" in time domain (using MotionSP library). What condition (e.g. frequency 10Hz - 1kHz use speed and Above 1kHz use acceleration peak) will be used Speed in time domain and Acc Peak in time domain? Please advise. Thanks!Source: Getting started with the STM32Cube function pack for multisensor nodes with signal processing to enable predictive maintenance - User manual

Hi I use a nucleo L432KC for a POC with an ASM330LHH. I use the internal FIFO of the ASM330 to store accelerator and gyroscope datas. I use an SPI to get datas periodically.During developpment, we used the 3.3V of the nucleo to supply the ASM330. We didn't notice this issueNow, we use a lipo battery and a traco DC-DC module to do my 3.3v. With it, I supply directly the STM32 on the nucleo and the ASM330. After a few second, the gyroscope always sent 0 dps on the 3 axes. The accelerators are OK. If we used a 3.3V laboratory power supply, we have the same problem. The only solution to use the gyroscope is to use the LDOs on the nucleo demoboard. Other information, during time that the gyroscope giving data, I "lost" regulary a data  from accelerator( 3 axes sent 0g).Thanks for your help or your tipsGraph for Accelerator (0g problem):Graphs for gyroscope :      

Hello ST Community, I am currently working on a flight computer for a model rocket. It will be used together with a barometric pressure to estimate the altitude. It would be very nice if someone could review my schematic and point out any mistakes.   

Is it necessary to enable Free Fall detection in order to detect orientation changes? What role does Free Fall (FF) play in this context? Additionally, is there a way to set a threshold force for detecting orientation changes, such as when the IMU is rotated left or right with a certain force, triggering an interrupt?And also can you share the code of 6d detection for lsm6dso

Hi Problems with a iio interface and using of buffer. Goal use the iio buffer interface for accel x y, z and temperture values.    Include one Channel more for the temperature.     static const struct iio_chan_spec st_accel_12bit_channels_temp[] = {ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 12, 16,ST_ACCEL_DEFAULT_OUT_X_L_ADDR),ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 12, 16,ST_ACCEL_DEFAULT_OUT_Y_L_ADDR),ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 12, 16,ST_ACCEL_DEFAULT_OUT_Z_L_ADDR),ST_SENSORS_LSM_CHANNELS(IIO_TEMP,BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),ST_SENSORS_SCAN_TEMP, 1, IIO_MOD_TEMP_OBJECT, 's', IIO_LE, 12, 16,ST_ACCEL_DEFAULT_TEMP_ADDR),IIO_CHAN_SOFT_TIMESTAMP(4) --------- DTB:

Adjusting the register values below seems to adjust the time at which data is written to the buffer. I understood that the value is similar to Data Sampling frequency.If i set the value to 6, about 1900 data per second will be written to the buffer.I would like to know the exact units of that value.

hello Good Morning,       i'm working on asm330lhh imu sensor, i want to get output in angle from raw value. please give suggetion and if you source code of imu sensor so share here.  

1.Sensor variant: IIS3DWB2.Communication Interface with ESP32 : SPI3. Data Reading is based on the ISR. Maximum sampling rate we are reading up to 6.7khz4.using the INT1_CTRL register for the Interrupt config  Issue Description : Based on the block size(Number of data samples read) we are reading the data from the sensor on SPI interface. For the one data acquisition cycle sometimes we are getting the intermediate Negative value and some times 0 as well.The data we are reading from the data read registers ( Register Name and Address : OUTX_L_XL - 0x28 ,OUTX_H_XL - 0x29, OUTY_L_XL - 0x2A, OUTY_H_XL - 0x2B, OUTZ_L_XL - 0x2C, OUTZ_H_XL - 0x2D).For the Axis the data should be either positive or negative. But sometimes we are getting both values from the above register. As per the logs we can see the Negative value is in the range of (-20000 to -32768). This is unexpected values we are getting from that data acquisition cycle.The same is happenin

Can LPS22HB be used to measure liquid pressure inside a miniature container with NACL solution. The sensor will be mounted at one end of the tube like container (4mm diameter). The pressure inside the liquid will keep changing due to the pressure applied from the other side of the tube. Do you think this sensor can be used in such environment ? The pressure range would be within the specified range if this sensor. Also how do you compare LPS22HB with LPS28DFW ?thanks

Dear All, I am using the LIS2DH12 accelerometer that is incorporated within a Decawave DWM1001-DEV board. I am attempting to write a C program using the dwm.h library functions to display the acceleration values for the X, Y and Z axes via I2C constantly. However, after writing my program, I realised that the program only outputs a constant reading of -32640 for all axes as shown below even when I move the accelerometer.My code mainly uses the dwm_i2c_write() and dwm_i2c_read() functions from the dwm.h library with the descriptions of the functions as shown:The main file and header files for my program are attached below. I would appreciate any help on shedding some light on any errors I have made in my program which might have resulted in my problem.Main function:void app_thread_entry(uint32_t data){uint8_t writeData[2];// Enable X, Y, Z axes and set ODR (data rate) - for example, to 10 HzwriteData[0] = 0x20;writeData[1] = 0x27;dwm_i2c_write(0x19, writeData, 2, false);// Set