MEMS (sensors)

Hi,We are using LIS2DH12TR accelerometer sensor in our application. Attached is the circuit for the same. We are using a P-channel Mosfet part# BSS84W-7-F to switch the sensor on/off. We are able to switch On the sensor through the Mosfet but we are not able to switch it Off. We are able to get the sensor data on I2C lines read by the controller though we are turning it Off through the Mosfet. Do I need to select Chip select CS = 0 for completely turning it off ? We are getting supply or voltage at VDD/VDDIO even if we remove or unmount the Q1 mosfet and all the related resistors(R5,R8,R10,R11) whereas CS=1. When we keep CS=0, then we are not getting supply/voltage at VDD/VDDIO. Can you please help us to understand why is this phenomenon occuring ?

I am working on a project to connect the AIS2IH accelerator with the MSP430FR2532 board for an motion detection product. I had decided to use the SPI bus interface to connect the two devices. The hardware connection are as follows: MSP430AIS2IHSPI meaningP2.2CS(AIS2IH specific?)P1.1/ USB0CLKSPCSCLKP1.2/UCB0SIMOSDISIMOP1.3/UCB0SOMISDO

Hello dear ST-Forum,I have a problem that I can't solve, the sound coming from the microphones is very noisy and none of the acquired data sounds like a sound and this despite all the documentation (MP34DT01 datasheet, AN4990, AN5027, ...) and videos (STM on youtube) that I have seen.I use an Octave program to retrieve the sound data from the UART port.My DFSDM configuration is: 80MHz audio clock, divide by 40. So I have 2MHz PDM clock and I use a low-pass filter (Sinc 3 filter) with FOSR=125 so I capture a signal at 16 kHz. The card has 2 stereo microphones, so I didn't forget to put a channel on the rising edge and a channel on the falling edge.Here's the code for the microcontroller program and for the Octave program.For the variables: #define AUDIO_REC 2048int32_t RecBuff0[AUDIO_REC];int32_t RecBuff1[AUDIO_REC];int8_t

Hello All,Need to read the values from the embedded Temperature Sensor in LIS3DH via I2C communication I had made the following configurations as mentioned in the datasheet,1. CTRL_REG4(0x23) = 0X802. TEMP_CFG_REF (1Fh) = 0XC03. Trying read the temperature value from the following register OUT_ADC_3_L(0x0C) and OUT_ADC_3_H(0x0D).     - Getting the value from the OUT_ADC_3_H(0x0D) as 8. If I expose heat near to the chip the value is increasing. How to convert this(8) value to temperature?Kindly assist me to get the conversation formula. Here the Vdd supply = 3.3V. Thanks in Advance. Regards,Surya S   

Hellow community, I'm currently working with the IIS3DWBTR sensor, which I purchased from Mouser Electronics. I've encountered an issue where the `WHO_AM_I` register (0Fh) is returning a value of `0x76`, whereas the expected value is `0x7B`.The SPI bus signal seems fine, and I've checked the usual suspects such as clock speed, voltage levels, and signal integrity. The sensor initialization also appears to be correct.Has anyone else experienced this issue or have any suggestions on what might be causing this discrepancy? Any help would be greatly appreciated.Best,

I need to clear the fifo and then at a later time read all samples taken since then.  Then later I will repeat this. I don't want any samples before or after that time window to get in my data.  I looked through the library and I can't see anything that will reset the fifo.  How can I achieve the time window sampling I describe above?  Thanks in advance ...

Hi, I am using MKI109V3 as motherboard and MKI239A as IMU adapter. My Unico version is 9.16. Following UM2116, I tried everything in Windows 10, including firmware upgrade to 3.58.2 (latest), and all data display works fine in Unico.After that, I wanted to check if Unico also works in Linux as suggested in UM1049. I installed it in Ubuntu 18.04 and used "sudo chmod 666 /dev/ttyACM0" to open the serial port. I double checked and am sure that ttyACM0 is the relevant one for USB connection of motherboard.However, after opening the port in terminal and choosing MKI239A in Unico GUI, another error message shows that "COMMUNICATION ERROR! Please reconnect the board and click 'OK'". I am confused and was wondering what I should do for troubleshooting... Maybe I missed some settings?Thanks! 

Hi, I am currently using an ASM330LHH MEMS, and seem to be getting erroneous spikes in data from the temperature sensor (see attached image). Please can someone advise on what this may be, or if you have experienced the same issue? I have been working through the temperature decode in my data acquisition (which seems to be okay), but I could be wrong. Many thanks. 

hey there,Im trying to use lis3dh in low power consumption mode and hope to get advices on how to use the interrupt and the registers set up for minimum power consumption aiming to few micros.

I interested in the higher frequency range of this device. The datasheet states clearly the LF cutoff at 35Hz, but there is no real discussion on the HF end apart from the characteristic graphs stopping at 10KHz. The device can be clocked up to 3.3MHz so it would seem that there is scope for higher frequencies. Is there any characteristics or design information for going above 10KHz and what are the tradeoffs? I see from some other posts that SNR is affected as the clock frequency increases.Any guidance appreciated.ThanksJulian 

Hi! I am using the SensorTile.box PRO in Expert Mode and try to log both Gyroscope and Microphone on the SD Card. When I try to upload the App I receive this error message: "There was a timeout error loading the App on the board". If I make an App to log only Gyro or only Microphone the App is uploaded and everything runs ok (in the first case a .csv is generated while in the second a .wav is generated). Thank you!

Hi @Eleon BORLINI, I am trying to build a custom 9 dof imu using LSM6DSO and LIS3MDL in mode 2, according to LSM6DSO datasheet.I found this page on AN5192 about sensor mode 2 (pg. 63). i2c master would be LSM6DSO and i2c slave would be LIS3MDL in this case. I will only be using i2c communication for reading LSM6DSO and LIS3MDL data.If I were to add external pull ups like the illustration above, what would be the recommended Kohm or, at least, a Kohm for good starting point for the pull up resistors in this case? 

Hello,     I have applied for the ASM330LHBxx ASIL B library from ST's web, and integrated it to my program, all the functions worked fine. But the noise of GYRO has gone beyond our requirement, we used to enable the LPF in ASM330 to lower the noise.     We have checked the integration manual of AB lib, it doesn't provide a function to set and enable the LPF filter, and it forbids users to set ASM330 without using AB lib(according to the Introduction sector in the manual). Is there any method to set and enable the LPF function even though using AB lib?

Hello,Actually i'm trying to mesure the pressure using LPS28DFW and arduino uno, but i have some problems, the i2c communication does not working.Can help me please and thank you.arduino code : #include <Wire.h>#include "SparkFun_LPS28DFW_Arduino_Library.h"// Create a new sensor objectLPS28DFW pressureSensor;// I2C address selectionuint8_t i2cAddress = LPS28DFW_I2C_ADDRESS_DEFAULT; // 0x5C//uint8_t i2cAddress = LPS28DFW_I2C_ADDRESS_SECONDARY; // 0x5Dvoid setup(){    // Start serial    Serial.begin(115200)

Hello We are working with accelerometer LIS2DW12.we did tests on the different movements of the accelerometer and the graphs we see (the graphs were made with the x_physical y_physical z_physical values). However we see graphs that are not as we expected; when we look at a 'free fall' movement we expect to see all axis intersect in value 0, however it is not the case.For example:in this image we see free fall when the orientation bit raised on zh (meaning the fall was on zl), but I do not see intersection of all axis ( Z is not even close) and I do not see intersection on 0 - x&y intersect on ~300 . Please explain this.

Hi,I designed a special board that includes the LSM6DSO32 sensor. I can get gyro and accelometer data from this sensor correctly. But even though I enable the pedometer output in the embedded function part of the datasheet, I can't get it. Can you help me step by step what to do?I would appreciate if you write step by step which data I will send to which register to make a step counter.Thanks for helps.Buse.

Hi,I am using MKI109V3 with Unico Lite and MKI239A. Following UM1064, I need to edit the source code to add MKI239 as additional evaluation board for a combo of acclerometer and gyroscope.The UM1064, user manual of Unico Lite, suggests to find “number of data bytes coming after *start” and "setdb" from UM2116. But the relevant information for MKI239A is not included in UM2116/Table 4 "Returned values for *start command". May I kindly ask if this information could be provided? Thanks a lot! I am trying to make everything work before Christmas.  P.S. Below are two screenshot from UM1064 (Section 1 and Section 3.1), showing it is supposed to be straightforward to add new evaluation boards, as long as info is provided in UM2116 table 4...

I am reporting below a post created in March 2023 because I did not receive any response. Hello everyone,after some time that I use the sensor, it gives me back a temperature value of 0 °C.I'm using a library taken from github that I adapted to work with the STM32F407 microcontroller (can't post the link).The sensor works well but sometimes (not always) it "fails" and gives me back the value 0 °C. To "fix" it I have to reboot the whole system. Can anyone give me an explanation? Why is this happening?I use STM32F407 microcontroller.Thank you.

  LIS2DH12TR   have  some questions for help below: 1. The captured accelerometer data found that there was a fixed frequency of jitter, and I wanted the manufacturer to determine whether it was a problem with the hardware itself2. I would like to ask the manufacturer whether the accelerometer needs to be calibrated at the factory or powered on

Hi team,                 I have purchased STEVAL-MKBOXPRO, It has LSM6DSV16X IMU with SFLP algorithm. MotionFX algorithm used in Algo builder. Is there any difference between those algorithm?. Which one is give more accurate output?

I have integrated lsm6dsv16bx in my Microcontroller and I'm able to see the IMU datas in output for example:  AX=61,AY=-131,AZ=-997,GX=-770,GY=2380,GZ=560.I have used the example code provided in the ST's official github page(https://github.com/STMicroelectronics/STMems_Standard_C_drivers/blob/master/lsm6dsv16bx_STdC/examples/lsm6dsv16bx_read_data_polling.c).I'm able to see the changes in output during movement, & there seems to be less change in output while the sensor is static.The thing is, how can I confirm if this value that i'm getting is correct/accurate? is there any way to confirm/evaluate this value?

I would like to use the following MEMS microphones to test the resonance frequencies of an ultrasonic bath: https://www.st.com/en/evaluation-tools/steval-mic007v1.html#overview I would like to ask what other parts I need to convert the analog signal of these MEMS microphones so that the measurement data can be read out on my PC via USB cable. Alternatively, could you recommend other MEMS microphones that already have an integrated analog-to-digital converter and are suitable for measuring frequencies in the ultrasonic range (~80 kHz)? What additional components would be required to transmit these signals via USB?   Many thanks in advance!

I need to connect two "STHS34PF80" sensors on the same I2C bus ,so does the "STHS34PF80" ST_IR sensor have the option to change his address as a slave by SW or HW?

Hello,I'm currently working with a custom board designed to read digital values from an accelerometer, specifically from the OUT_X, OUT_Y, and OUT_Z registers. However, I've encountered an issue: despite the accelerometer being physically stable, I am observing a significant number of peaks in the readings. These peaks consistently show an amplitude of around +/-250 units from the base level, which seems unusual.For context, the values I'm observing are 16-bit, and I'm operating the device under a 2G high-speed setting with an 800Hz Output Data Rate (ODR). I'm aware that the effective resolution is 14 bits, as the values are left-justified, with the least significant 2 bits not holding valid information. Given this, I would normally expect any inaccuracies to be within +/-7 units, not the large deviations I'm seeing.When I move the board, the readings for X, Y, and Z change as expected, which further puzzles me about these unexpected steady-state peaks. Are such

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