MEMS (sensors)

This is the result of getting the pressure value and temperature of LPS22HH.①1051.5 hPa, 22.5 ℃②1083. 8hPa, 30.7 ℃This is the result of obtaining the pressure value of the pressure sensor 2SMPB-02B for comparison.①1015.3 hPa②1015.2 hPa① is the value at a room temperature of 22°C.② is the value about 30 seconds after heating with a dryer.I am using STEVAL-MKI192V1.There is a difference in pressure change due to temperature.Am I missing some necessary setting?

Hi,​ I am looking lis2dh12 driver initialization with fall interrupt detection.​Please share sample program for understanding.​Regards,Kumar​

Is it possible to use SAI for PDM microphones and ALSA with the current Linux kernel on a STM32MP157CAA SoC?

My first time exploring with STEVAL hardware. I just received the STEVAL-MKI108V3 mother board, the STEVAL-MKI196V1 sensor board, and installed UNICO GUI 9.13.0 and FW Version V3.11.4. When starting the Unico Program with both "Automatic Port Detection" and "Communication with the motherboard" enabled then selecting MKI186V1 sensor (LSM6DSO), a dialog box appears saying "The WHO_AM_I register value does not match the device selected." Looking at the motherboard and sensor board documentation, there does not seem to be any jumpers for setting device address.I have verified the orientation of the sensor board into the DIL socket. I believe the LSM6DSO address is either 0x6A or 0x6B, but have no idea what address Unico is looking for. Any suggestions on how to resolve this?Out of curiosity, with USB plugged into mother board and blue LED is on, I measured the voltage at pin VDD to GND on sensor socket and it is 30mv (expected 3.6v). Is the devi

STM NUCLEO-L4R5ZI-P is used to interface the  STEVAL-MKI182v2(ISM330DLC) .

Hello, I am using the I3G44250D gyroscope without soldering the capacitors (C1=10nF,C2=470nF) and resistor (R2=10k) indicated for the PLLFILT, by using a configuration in which only the LPF1 filter is applied by default. With this configuration the gyro is not able to read samples from FIFO. However, if I weld those components the reading of samples from FIFO is correct. ¿Is that PLLFILT required to be mounted for gyro to work or can it be disabled by setting a register to avoid mounting those components?Thank you very much.Carlos

Hello, I am using FP-IND-PREDMNT1 and new to this . From the data website it says it is used for time and frequency domain signal processing and analysis of 3D digital accelerometers with flat bandwidth up to 6 kHz. I wanted to know if is it possible to determine the frequency of a vibrating signal(constant but varying after some time 5-10 mins ) .The frequency range is from 100-300 Hz.Is it possible to get the exact frequency range from the FP-IND-PREDMNT1. Which software example?Regards,P

There does not seem to be anything in the datasheet about set tolerance, or drift over temperature.  https://www.st.com/resource/en/datasheet/lsm6dso.pdfAssume the INTERNAL_FREQ_FINE is unchanged. It has a step size of .15%, so one would presume the best you can do is around that if it is calibrated. I am more concerned with the un-calibrated difference, and how that might change over temp. Thanks.

Hi!I am using the STEVAL-BLUEMIC-1 to do wireless audio recordings, and I am noticing that the recordings get sped up. Is there a fix to this, or a reason why this may be happening?Thank you,Imran

In our project we want to detect device is worn by user or not but there is no proximity sensor or another sensor which will help us to detect device is worn or not. But we are using IMU sensor in project so with help of accelerometer data, orienatation can we accomplish our task?

I use the following devices and software:STEVAL-STLKT01V1(STEVAL STLCR01V1)ST-LINK/V2/ 01-0STM32CubeIDE 1.9.0STM32CubeMXSTM32CubeProgrammer​I was able to implement SENSING1 on the device, but I can't specify the board on the MX, so I can't train the A

In the case of power on, sometimes, the controller failed commnunication with LPS22HH.The controller side accesses LPS22HH in the following order of processing;1 power on2 wait INT_SOURCE (@24h) BOOT_ON = 03 Set the BOOT bit of the CTRL_REG2(@11h) register to 14 wait INT_SOURCE (@24h) BOOT_ON = 05 Set the SWRESET bit of the CTRL_REG2(@11h) register to 16 wait SWRESET bit of the CTRL_REG2(@11h) register returns to 07 write ONE_SHOT order CTRL_REG2(@11h) ONE_SHOT = 18 wait CTRL_REG2(@11h) ONE_SHOT = 09 wait STATUS(@27h) T_DA and P_DA = 110 read press and tempWhen this process is followed, communication sometimes fails and sometimes succeeds.Does anyone know how to solve this problem???

I am using lsm6dsl sensor.using fifo, we continue to receive accel, gyro, and timestamp&step information in units of 18 bytes, but intermittently strange values continue to come in. Can you tell me why?​I think the order of the data accumulated in fifo is broken, can it be like that?All ODRs were same equally.configuration :XL_ODR_208HzGY_ODR_208HzFIFO_208Hz16g, 500dpsXL_ANA_BW_1k5HzLOW_NOISE_LP_ODR_DIV_100HP_65mHz_LP1_NORMALBDU Enable​/* Output log: TIMESTAMP count */ t[0][0]=473000t[18][7]=473193t[36][14]=473386t[54][21]=473579t[72][28]=473773t[90][35]=473966t[108][42]=472806t[0][0]=1023    <- abnormalt[18][7]=16777215 <- abnormalt[36][14]=767   <- abnormalt[54][21]=255   <- abnormalt[72][

I'd like to raise attention of ST staff regarding the LPS28DFWTR pressure sensor and what I believe is a sensor design issue (I hope I'm wrong, because it is an amazing sensor nevetheless!).The original topic was here:https://community.st.com/s/question/0D53W00001r8PF1SAM/what-is-the-material-the-membrane-is-made-from-on-the-lps28dfwJust in case I copy-paste results of my quick research here:I confirm that LPS28DFWTR is not just sensitive to sunlight, it is sensitive to ANY light! It feels like some p-n junction on sensor's die is exposed to light through transparent silicone and it's confusing readings/I2C. I'm attaching video here:

Hi, I have an application that suggests the pressure sensors are very sensitive to sunlight. 1. I have noticed the same behaviour. Can anyone confirm if the sensor experiences a photo-electric effect that amplifies the signal current within the sensor?Images below are of a device with two LPS33HW sensors mounted in orthogonal directions being dipped in and out of water. In the first case this is done inside under ambient light, in the second it is outside in direct sunlight.

From the Detail, it just mention fully compatible with the STEVAL-MKI109V2Fully compatible with STEVAL-MKI109V2 motherboard

Hello,I cannot find any detail about the output type of INT1 pin in the ISM330DHCX datasheet.From what I read about the registers configuration about this pin, I thought that would be a push-pull output, but if I configure an external 10K pull-up to 3.3V I see that the signal is fixed to 1.2VI already found the note about the initialization procedure that depict not to set any pull-up (so I'm removing that), but this behavior is not explained by a simply output pin.Is maybe this also a bootstrap input for internal use?For the use with the linux driver st_lsm6dsx (that has this component's compatible) should I set a pull-down or leave the control only to the ISM330DHCX?Best regards,Rosario

Hello,I'm working with blueVoice over sensorTile.I downloaded FP-SNS-ALLMEMS2 project version 2.1.0 and also project FP-SNS-ALLMEMS1 in version 4.2.0 and 4.1.0On Android side i'm using ST Ble Sensor app from Play StoreAll of them give me a very bad audio, with a cracking noise in background.I have good result only using a second SensorTile with preinstalled FP-SNS-ALLMEMS1 in version 3.1.0.Unfortunately I not able to find source project related to this version (3.1.0).Are they available in some way?Thanks to all and regards

We are exploring MP34DT05TR microphone for our new product. If we connect flying wires on soldering pads then it works fine. But when we have hand soldered it on STEVAL-MIC001V1 PCB (Gerber of this PCB available on ST website), it is not working. We also done soldering the second time with APP machine by following proper heat flow as per datasheet recommendation, but this time also mic not working. This time Clock and data signal are proper but we can hear only noise, it is not capturing anything.

Hi.For accelerometer LIS3DHTR, the output signals INT1 and INT2, pins 11 and 9, they are both push-pull (CMOS) outputs? or one of them, or both, have open-drain configuration?For my projects it is better that both INT1 and INT2 be CMOS outputs.Regards,Jeferson Pehls. 

I've been working with a LPS28DFWTR pressure sensor and noticed it's pretty sensitive to sunlight. As in, the pressure will climb significantly when the sun shines on it. Because the membrane appears to heat much faster than the temperature sensor it, the reported pressure isn't temperature compensated. This isn't really a problem but I'm curious what material is used to make the membrane?

 can u help me fix this issue? sometime it gives alert when there is no noise

We've been using the LSM6DS3 for several years, and are considering a switch to the LSM6DSM. It appears they are pin-compatible, and a superficial look at the register descriptions indicates they could be software-compatible as well, i.e. I could swap the ...DSM onto the same PCB and it may work out of the box.Sadly, my SMT reworking skills aren't yet up to the task of swapping the ICs on a board, and I'd prefer not to spend half a day comparing the datasheets line by line, so I'm hoping somebody can answer the question off the top of their head: can I swap out the LSM6DSM on this board and expect it to work without changing my code at all? I'm not doing anything fancy with it, just setting ODRs, ranges, and using the FIFO.EDIT: I *did* manage to rework a board, and I2C communication appears to be working, but the data isn't yet flowing. It's possible that the INT line somehow isn't connected while the rest of them are.

I'm trying to get the VL53L1X GUI to work with the VL53L1X evaluation board on Windows 10 and have hit a roadblock. I've successfully installed the STSW-IMG008 software, installed the drivers with STSW-link009, and have updated the Nucleo's firmware with STSW-link007.However, I get a "Failed To Connecto to Nucleo Board: Com Port Not Detected" error in the GUI program. When I try to program the device with the "Flash Fw" button, I get "Sensor Not Detected. COM84 Connected: Please ensure sensor connected then Press Black Reset Button on the Nucleo." Pressing the black reset button doesn't do anything - none of the LEDs on the board change at all when pressing it. Under the Device Manager, the device is listed as STMicroelectronics STLink Virtual COM Port and the device shows up as a USB storage device labeled NODE_F401RE, so I believe I have the drivers correctly installed.I can drag the VL53L1X_RangingExample bin file onto the device and read

Hello everyone,I am developing a project involving an Arduino Zero-like microcontroller and some I2C sensors, including the ST VL53L0X ToF sensor. One of my requirements is not to use the Arduino's Wire library for I2C communication, so I'm almost obliged to put my effort trying to understand the ST API for this sensor.What I'm trying to achieve can be summarized as follows:Initialize the sensor and configure it in Single Ranging ModePeriodically poll the sensor to retrieve distance measurementsOn one side, I've been able to write an I2C driver to communicate with my sensors, including VL53L0X and MPU6050 accel-gyroscope. However, for VL53L0X I got stuck in the initialization process.Here is the expected workflow, using ST API and following "vl53l0x_SingleRanging_Example.c" included with the library:Call VL53L0X_DataInit() --> receive VL53L0X_ERROR_NONECall VL53L0X_StaticInit() -->