MEMS (sensors)

Hi Team,We are using the LIS2MDL magnetometer sensor in the I2C connection on the xilinx zcu106 evaluation board, which we are connecting to i2c0.We are using the default Linux driver for lis2mdl.https://github.com/Xilinx/linux-xlnx/tree/xlnx_rebase_v5.10/drivers/iio/magnetometerFrom the ZCU106 user guide, J160 pin,https://www.mouser.com/datasheet/2/903/ug1244-zcu106-eval-bd-1596082.pdf

Spoiler (Highlight to read)Hello everyone,I received a STEVAL-STWINKT1B to conduct research about predictive maintenance, and right now I need to get some data into my computer through USB. I have installed FP-SNS-DATALOG1 on it. I followed the manual for the particular firmware and in the guide, in Device Manager, it shows as STM32 BOOTLOADER, not Multi Sensor streaming as in the tutorial. And when I try to run the USB_DataLog_Run.bat, I get the message that no USB device has been found. Any advice will be greatly appreciated.

Hello community,my sths34pf80 is connected with a wireless MCU through I2C in fast mode. during the initial process the function " sths34pf80_presence_threshold_set(&presenceHandle, 200); " is called, sometimes there is no problem, the sths34pf80 can be successfully initialized, it can detect presence and motion.But it also happens oft: if the ctrl1.odr is 8, then it hangs by excuting sths34pf80_odr_safe_set(if ctrl.odr is 0, the initial will be successful.)int32_t sths34pf80_presence_threshold_set(const sths34pf80_ctx_t *ctx, uint16_t val

 I am trying to get the raw data (with timestamp included) from a few IIO devices (hardware sensors, such as accelerometer, gyroscope, magnetometer and barometer) mounted on a linux platform. I was able to get the data for the accelerometer and for the gyroscope using the libiio library within a C++ code (attached below). However, for the magnetometer and for the barometer it seems (I'm not expert in this field) they require (or have already set-up) some kind of trigger. For this reason the code I wrote cannot be used as it is for those two sensors. I do not need any trigger as I'd like just to get the flow of data without any "event" to start the logging. However I don't know if it's better to disable (if possible) the trigger or somehow to set it up in someway. To make it more clear,Here the result of the

 Hi everyone, I have an STM32L4 series-based board with an embedded LIS3DH sensor. I've written code to read temperature values from it, configuring all settings as per the datasheet. However, I'm having trouble obtaining the exact temperature value from the ADC3_L registers. Below I attach the code also:1. I am enabling the temp sensor and after I am using LIS_read_ADC function to get the value stored on it. 

GreetingsI am trying to utilise the FIFO of the LIS2DW12, in bypass-continuous mode, which requires the latched-interrupt bit (LIR) in CTRL3 register to be set, as stated in the application note AN5038.In the ISR for the FIFO_FTH, I am reading the output registers, resetting the fifo by putting it into bypass mode, then putting it into bypass-continuous mode. The interrupt to trigger the chip is a wake-up event.I want to also utilise the inactivity/activity functionality of the accelerometer, allowing it to save power. This requires the LIR bit of CTRL3 register to be in a reset state. How does one propose I work around the contradiction of either setting the LIR bit o

Hi I am using the LIS2MDL Magnetometer, which is connected to i2c0 on my custom board. I have enabled the respective kernel configuration for the magnetometer.CONFIG_IIO_ST_SENSORS_I2C=yCONFIG_IIO_ST_SENSORS_SPI=yCONFIG_IIO_ST_SENSORS_CORE=yCONFIG_IIO_ST_MAGN_3AXIS=yCONFIG_IIO_ST_MAGN_I2C_3AXIS=yCONFIG_IIO_ST_MAGN_SPI_3AXIS=y The implemented device tree is provided below.\{regulator_1: regulator-1 {compatible = "regulator-fixed";regulator-name = "regulator.1";regulator-min-microvolt = <1800000>;regulator-max-microvolt = <1800000>;regulator-always-on;};};&i2c0 {status = "okay";lis2mdl: lis2mdl@1e {compatible = "st,lis2mdl";reg = <0x1e>;vdd-supply = <&regulator_1>;vddio-supply = <&regulator_1>;};};Whe

Hi,I have successfully connected the LIS2MDL magnetometer to my reference board via I2C, and it is detected. However, after enabling the necessary kernel configurations and device tree, it indicates that the VDD supply is not found, and it resorts to using a dummy regulator supply. Additionally, there is a probing issue. I have provided the enabled configurations, device tree, and logs below.kernel configurationCONFIG_IIO_ST_SENSORS_I2C=yCONFIG_IIO_ST_SENSORS_SPI=yCONFIG_IIO_ST_SENSORS_CORE=yCONFIG_IIO_ST_MAGN_3AXIS=yCONFIG_IIO_ST_MAGN_I2C_3AXIS=yCONFIG_IIO_ST_MAGN_SPI_3AXIS=ydevice tree&i2c0 {status = "okay";lis2mdl: lis2mdl@1e {compatible = "st,lis2mdl";reg = <0x1e>;vdd-supply = <&reg_3v3>;vddio-supply = <&reg_3v3>;};regulators {reg_3v3: regulator-3v3 {compatible = "regulator-fixed";

Hello,have designed in an LSM303AGR to replace an obsolete NXP chip, it used in I2C mode at 3.3V, and there are twopins that is not used, i.e. pin 7 - INT_MAG/DRDY and pin 12 - INT_1_XL.Upon testing, when the complete system is in sleep mode, we have found that on some units,the current consumption of the LSM303 may be up to 1.5 mA. By either warming or cooling the LSM303 currentgoes down to almost zero.Otherwise, everything works fine, and the LSM303 is waking up the instrument automatically when the user ismoving it, and also changes its state when moved close to a magnet...It seems like one or both of these pins may go into floating state explaining the higher current draw, what is STs recommendation here?I can't find anything in the datasheet (DS) on how the I/O of these pins are designed and how to handleunrouted pins on this chip... (The layout is also extremely area constrained so there is

Hi,I'm using an MP23DB02MM digital mic on the CCA02M2 eval board and using the PDM2PCM library. When I have no sound into the microphone the noise floor I see in the data from the PDM2PCM output is around 1,000 counts peak to peak noise. I'm struggling to understand how to use the datasheet SNR and Sensitivity figures to get a noise floor figure. My calcs make the noise I'm getting look really high, even considering there might be a little tiny bit of acoustic noise getting in. What should I expect roughly as a peak to peak noise from this setup? I'm running at 48KHz output PCM rate with decimation of 64.ThanksJulian 

Hi there,We are testing the ASM330LHH with the motherboard STEVAL-MKI193V1 and use Unico-GUI to collect data.  ODR was set to be 6667 Hz and easy configuration was used. The excitation was a 1kHz sin wave but the data saved using Unico-GUI showed a frequency of ~967 Hz. would really appreciate any help to trouble shoot?  Thanks 

Hello,LIS2DH12 accelerometer. Datasheet AN5005 shows Table 4.Is this the speed of data transfer via the SPI or I2C interface? Or the speed of converting data into accelerations and writing this accelerations to the OUTX_H and OUTX_L registers?

Hi Team , I'm using your ST acc and gyro LSM6DSOTR datasheet https://www.st.com/resource/en/datasheet/lsm6dso.pdf at sometime an acc stop sending its values can you guys please help me figure the issue  and whenever i restart then its sending values whats the problem PCB Layout 

Hello Developers,In my product we are using ST Mems senor LSM6DSOX with Noridc chipset. Currently only acceleration data is read from sensor every minute which gives 1 sample of x,y.z axis accleration in mg/minute.  Configuration of LSM6DSOX sensor:ODR :  6667HzScale:  16g Now in my solution i want to calculate the velocity (m/s) of the object in x,y,z, direction using this acceleration data points.  Currently i am using this python script to calculate velocity, but i want to verify is this the right approach. I have taken two values as sample when node is steady in ideal condition. Python script attached for reference.     Can anyone let me know how we can convert acceleration data to veloctity ? 

Hello, What is the maximum data transfer rate over the SPI interface for the LIS2DH12 accelometer? The datasheet doesn't say anything about this. About the I2C interface it is said that it can operate in standard mode (up to 100 kHz) and fast mode (up to 400 kHz). But nothing is said about the SPI interface.

Hi,I am using IMU sensor LSM6DSO set to 100 Hz sampling rate. I am trying to figure out what is the tolerance of the IMU sampling frequency set by it's internal clock. How confident can I be that when I set it to 100 Hz, it will not fluctuate to higher/lower frequencies?

Posted on June 02, 2015 at 18:20I have an application using the LIS3DH.  I need to read the values from the on chip Temperature Sensor.  I have properly setup the ADC_PD and TEMP_EN bit in the TEMP_CFG_REF (1Fh).  I'm reading the OUT_3_L (0Ch) and OUT_3_H (0Dh) at an ODR of 50 Hz.  The OUT_3_L seems to be random while OUT_3_H looks like valid data.  Three different chips measure (OUT_3_H)  as follows FA, F6 and FE.  This translates to -6, -9 and -2.  The Datasheet describes the TSDr as Temperature sensor output change vs temperature with a resolution of 1 digital/C.  So my assumption is that the translated values of -6, -9 and -2 are delta (changes) from some reference temperature (possible at MFG calibration).  The ambient temperature in the room is 23 C (~73 F).  My assumption per Datasheet was that the reference temperature is 25 C but this only correlated to the 3rd value.  Is there a

Hello, ST community,Recently, our team has been working with the LIS3DH accelerometer with a STM32WLE5 MCU. Some of the requisites we have for the project are: it works with a 400 Hz, 16 g Full Scale, High Resolution mode, High Pass filter activated, I2C communication, and the interrupt threshold must be small - due to the nature of the 16 g function, we went with the lowest possible value, 186 mg according to the datasheet. The problem is that the interrupt simply doesn't work with those configurations: when we set the interruption duration to 0 or 2.5 ms, the interrupt pin is always high, but if the duration is any higher than that, the interrupt never triggers. This issue doesn't happen when we set the INTx_THS register to any value above 0x01 - 0x02 has a normal behavior regardless of the INTx_DURATION written. This issue also happens when we set the Full Scale to 8 g. Is this a known issue or am I doing something wrong? The basic code idea is written as it follows:

Hi ST experts,  Can help to advise that 9axis (IMU+Mag) is a viable solution for indoor head tracking and positioning?There are multiple references stating that the magnetometer is prone to magnetic field interreference indoor and is suggested to ignore the magnetometer's readings. Is this statement correct? Thank you.

Hi, I am looking for reliability data for :ASM330LHH - ISM330DLC - ISM330DHCX - ISM330DHCXTR - LSM6DSO - ISM330 DLCTRI am looking for especialy MTBF or FIT but also if possible MTTF. Where can I found them ? Thanks by advance

Hi,I am using a LSM6DSO and ESP32 to read it.I am handling the FIFO FULL interrupt by adding a new task to a queue in order to print a message and in the main loop I am reading the buffer of the sensor.It is working perfectly at 833Hz, but if I set it to 1667Hz, I get the FIFO FULL interrupt just once and then it stops.I am thinking that the problem may be from ESP32, but what stops the sensor to give another interrupt once I emptied the FIFO? I am using a logic analyzer and I can see that I have the interrupt, the SPI FIFO reading and no interrupt after that.Regards,Gabriel

Hi all, I am implementing the following GitHub code to initiate sensor fusion in the LSM6DSV16X sensor chip. The board will communicate via UART however there seems to be an issue reading and writing to registers via the HAL driver functions provided. I am using the NUCLEO-F411RE as recommended in the code with the ISK4A1 expansion board. If anyone knows what might be wrong with the HAL memory read and memory write functions please let me know. Could it be an incorrect I2C address being called? Or is there something wrong with the combination of boards I am using? GitHub Link: https://github.com/STMicroelectronics/STMems_Standard_C_drivers/blob/master/README.mdThe attached files are the C code files which I am trying to use. Thank you in advance! 

Hello,I have implemented LIS2DW12 driver into our product and self-test procedure according to the AN5038 (as a minor difference, instead of waiting 100ms in the process, I use 5 newest samples from FIFO after FIFO gets filled with 30 samples, i.e. discard 25 first samples and then take average over 5 last).After some testing we found that 99% of the time the self-test reports success, but there are some static positions where the self-test could fail.From what I have found, failure happens only on the third axis (z) and only on one test polarity at once (when retesting the same position on different test polarity, then it passes). At the same time, when I place the sensor in mirrored position, then I get a pass on previously failing polarity test and at the same time get failure on other polarity (still, the same axis).The problem is repeatable on multiple units and the output pattern is the same. The problem is repeatable with different sampling fr

Greetings to everyone, I would like to ask you for help. I want to track GPS in a closed position. I get latitude and longitude information from GPS in an open area. In a closed position, I want to get location information with the accelerometer and speedometer. When the object is going straight, the data coming from the sensor is very healthy. I can't get accurate results from time to time, so I'm sending you a part of the code. Does this make sense? I also examined the documentation of the sensor, but I couldn't get much results. Thank you in advance.     kordinat_t farkLocation(offlineParam_t *param){   lastLocation_t sürer; nowLocat_t

Hi all ,                I have stored IMU quaternion data into the SD card. I did use the Algo builder tool for that. I couldn't get the samples in configured 100Hz. Kindly help to store all samples in 100hz rate.