MEMS (sensors)

Hi Team,Good day!We are using LSM303D accelerometer chip in our tracker device. We are mainly using accelerometer data for any crash detection. We have around more than 5000 devices in field and many of them reporting sudden spikes in accelerometer axis data without any actual disturbance. We have configured our LSM303D chip with below configuration:Initial write CTRL0 (1Fh) to CTRL7 (26h) : data[1] 0 (0x00)              data[2] 111 (0x6F)         data[3] 24 (0x18)            data[4] 2 (0x02)              data[5] 8 (0x08)              

I'm using the STEVAL-MKI245KA development kit, trying to get the IMU readings with an AT-Mega through I2C. The I2C communication between the adapter board of the kit is working, but the IMU values recieved by the arduino are not updating. When I run the code to get the accelerometer and gyroscope values, the value is always 0 for all axes acc and gyro. (the reason I know the I2C is working is because when it wasn't working, the values were all -1, but when it does 'work' the values at all 0). Here is a screenshot from the datasheet of the IMU with the registers of all the parameters:And here is the code that I am using to access the

Hello, I am working on integrating IMP23ABSU into my hardware. Hence, I reviewed the evaluation schematic (steval-stwinkt1b) to understand its setup. I have a few questions regarding the schematic, in addition to what has been answered here, it would be great if you could answer them.1. There are three MREF in the schematic for steval-stwinkt1b, part of which is attached to this message as an image below. I understand what the ones circled in green correspond to, but what does the MREF circled in red correspond to?2. In the response here, it was mentioned that the amplification factor of 1 + R6/R7 = 2.34 is to take advantage of the microcontroller'

We use STM32F103RG to driver ism330dhcx, and use MotionDI to calculate the pitch and roll angle.Parameters:Frequency: 100HzScale: accelero =2gyro = 250AccKnod Caltype:OneTimeGyrKnod CalType:ContinuousSFKnod output type: ENUWhen the object roll angle is close to 90°, MotionDI calculate value is 150°。When the the object roll angle is less than 84°，MotionDI calculate value is normal。How to solve this problem?

Hello,I am developing an application that uses 8 ILPS22QS in 3-wire mode and a microcontroller that does not support this mode natively. A shift register is used to control the CS lines and it is working as expected.I tried to go around this problem by wiring the SPI as per the diagram attached.I am using the Arduino IDE and the SPI library.After enabling the SPI at a speed of 100000Hz (and set to MODE 3), I pull the first sensor CS pin low and immediately write to address 0x0E the value 0x60.After that I try to read back the same register (SPI.trasfer(0x8E)) and register 0x0F, but the chip does not respond. During the "reading back" part of the transaction, I tried sending either 0xFF or 0x00 on the MOSI, but the result is the same, on the MISO I just get a copy of whatever the MOSI is sending.I have also tried changing the 2.7k resistor between the MOSI and MISO pin for a 5k, but nothing changed.I have attached the full arduino code

Good Afternoon,I've been working on migrating from the LSM6DSO32 to the LSM6DSV32X and I notice that neither part specifies ODR Accuracy for normal or low power modes.  Is this information available? Thank you

I cannot connect to the ST sensor tile.box when using the ST BLE sensor APP. What should I do?

Hello, I'm using STEVAL-MKI109V3 and STEVAL-MKI193V1 (ASM330LHH IMU). Using the Unico GUI, I see that the IMU is detected and recognized however I don't manage to stream any data from the IMU. I enable the accelerometer and the gyroscope and set the sample rate, however no data is printed to the log file and to the GUI plot - GUI plot displays curves which are steady and zero and are non responsive.  Any suggestion on how to solve this issue? Thank you very much! 

Hi, I am looking for an accelerometer. I wonder if there is any ST MEMS chip that meets my requirements:I don't need very high max G force: 4/8G should be enoughLow power consumptionAble to send trigger, like a GPIO rising or falling signal, when acc value hits a threshold. Most importantly, for each axis (x, y, and z), the threshold value can be individually set.Have some memory enough to keep acc readings for the past a few seconds, preferably 10.For the last requirement, the app scenario is like MCU is triggered by the accelerometer to wake up from sleep mode, which may take some time. Hence, if the sensor has kept the data for the past a few seconds, the MCU is able to retrieve that history data before the trigger event.

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 1.3.0

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); iis3dw

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_WaitDeviceBooted

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 :

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?

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 Scanni

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.