MEMS (sensors)

If the electrode is embedded in an insulator, isn't the sensing process dielectric polarization rather than electrostatic induction?The following text is quoted from 「Application Note "Qvar sensing" (AN5755) p2.「 A signal is derived from the electronic circuit due to the fluctuations in the electric field resulting from the passage of the charged particles. If the electrode is embedded in an insulator or there is no direct contact between the electrode and the particles, the sensing process is achieved through electrostatic induction. 」

Hello Everyone, Have anyone measured the latency from sensing the physical motion to the output of the sensor? I couldn't find in the datasheet how much time the filters takes. Thanks

Hi There, I've designed a board which uses a LSM6DSO32 sensor over i2c for accelerometer, gyro and it's embedded pedometer function. I've been able to reliably get data from the sensors accelerometer and gyro registers however I've not been able to get it to return pedometer data. I'm aware of AN5473 and have followed this in my own application and have also implemented the public C driver for this IC found on github. I'm initialising the pedometer as follows```int lsm6dso32_init(void) { int32_t ret; uint8_t rst; if (!lsm6dso32_is_available()) { LOG_ERR("I2C device not ready"); return -ENODEV; } /* Initialize STM driver interface */ dev_ctx.write_reg = platform_write; dev_ctx.read_reg = platform_read; dev_ctx.mdelay = platform_delay; dev_ctx.handle = (void *)&dev_i2c; /* Wait sensor boot time */ platform_delay(10); /* Check device ID */ ret = lsm6dso3

Hello, I’m using the LIS2DU12 accelerometer and trying to perform the positive self-test exactly as described in the official application note. However, I’m consistently seeing results that do not meet the expected deviation thresholds, and the self-test fails on all axes. I’ve double-checked the register writes and delays and followed the datasheet carefully. If anyone has a known working configuration or insights on what might be going wrong, I’d appreciate your help. Thanks!

Hi,Where can I find inforamtion on Moisture sensitivity level for each sensors? I checked datasheets and few other documents in the product page but couldn't find it. I want to know the MSL of IIS3DWB.Best regards,Kev

Hi, i have a question, is it possible to use the embedded STLINK on the nucleo-f446re for programming the sensortile.box (steval-mksbox1v1) ? If so, how do i have to connects the pin? I have a JTAG Adapter v1.0 (included in the sensortile box), so i'm thinking about connecting it to the sensortile using the STDC14 connector, but how do i connect the adapter to the nucleo board? Do i only have to connect the CN4 pins (SWD) from the nucleo to the adapter?Thanks for the help

I've had this problem with an ILPS22QS and now I'm having it with an LPS22HH. It has me completely mystified. The issue is like this: The pressure sensor works as normal for a week or even multiple weeks and then all of a sudden it enters a mode where it no longer reacts to pressure changes properly. Instead it looks more like a capacitor where pressure peaks increase the value of the sensor and if there are multiple in quick succession they add up. Once the pressure goes back to environmental pressure the value slowly goes down. A picture illustrates this better. The picture is a recording of pressure values from 2 sensors of type LPS22HH on the same PCB. They've both been working fine for about a week now. Today one of them entered the weird-mode. Power-cycling does nothing. I've unplugged and replugged the PCB multiple times. The firmware of the PCB has not been changed, nor does it have non-volatile memory that could change its behavior. For both pressure sensors I take a drinki

I am leading a project in the automotive sector where we are using the ASM330LHH for mass production (we have assembled more than 2000 units). Our reading method involves not using the DATA-READY or interrupt; instead, we read at a rate of 417 Hz with our microcontroller's clock. To verify that the temperature compensation meets our quality standards, we conduct a temperature test ranging from -30 to 95 degrees on all units. During testing, we've observed that approximately 40% of the units exhibit spurious measurements at a specific temperatures. This issue is reproducible over time; repeating the test with the same unit consistently shows problems around the same temperature. These anomalies are spikes, consistently appearing in the X and Y-axis gyroscopes but never in the Z-axis gyroscopes or accelerometers. The BDU register is activated. I would like to understand why these issues might be occurring, as they significantly impact production. Thank you

I'm currently working with the LSM6DSV16X IMU and would like to connect an external sensor—specifically the SHT40 (a humidity and temperature sensor from Sensirion)—via the Sensor Hub feature.My hardware setup uses SPI for communication between the microcontroller (master) and the LSM6DSV16X. The SHT40 is connected to the LSM6DSV16X via the I²C interface (Sensor Hub port). Already got the other two sensors(LIS2 and LPS22) working.Here’s what I’m trying to accomplish:Trigger a measurement on the SHT40 through the Sensor Hub (Slave 0 write)Read the result using Slave3 (external sensor read)Eventually collect the data via FIFO or directly through Sensor Hub registersQuestions:Is it possible to interface the SHT40 as an external sensor through the LSM6DSV16X Sensor Hub while using SPI as the main interface to the host?The SHT40 does not use regis

Hello, I’m working with the LIS2DW12 vibration sensor for single-tap detection. I have configured the sensor registers according to the application note for enabling single tap. When I continuously read the TAP_SRC register in polling mode, I’m able to detect single taps successfully. However, I want to use interrupts instead of polling. I have connected the LIS2DW12’s INT1 pin to the PE7 GPIO pin of my STM32L496 controller. Despite this, I am not receiving any interrupt signal on PE7 when I tap the sensor. please check the single tap init function : void LIS2DW12_Init_Single_TAP(void) { message[0] = 0x74; if(HAL_I2C_Mem_Write(&hi2c3, LIS2DW12_Adrr, CTRL1, 1, message, 1, 1000)==HAL_OK) { message[0] = 0x0C; if(HAL_I2C_Mem_Write(&hi2c3, LIS2DW12_Adrr, CTRL6, 1, message, 1, 1000)==HAL_OK) { message[0] = 0x09; if(HAL_I2C_Mem_Write(&hi2c3, LIS

volatile UB__8 ubAisRxData; volatile UB__8 ubSpiStatus = 0; void SPI_vInit(void) { disable_interrupts(); configure_D_OUT_SPI_MOSI_Pin(); // PTBDD_PTBDD5 = 1; // MOSI configure_D_IN_SPI_MISO_Pin(); //PTBDD_PTBDD4 = 0; // MISO configure_D_OUT_SPI_CLK_Pin(); // PTBDD_PTBDD6 = 1; // SCK set_CS1_high(); // Sensor 1 disable set_CS2_high(); // Sensor 2 disable // SPI Control Register 1 SPIC1 = 0xD4; // SPE=1, MSTR=1, SSOE=0, CPOL=0, CPHA=0, SPIE=1 //SPIC1 = 0xF0; // SPE=1, MSTR=1, SSOE=0, CPOL=0, CPHA=0, SPIE=1 // SPI Control Register 2 SPIC2 = 0x00; // SPI Baud Rate Register (set to suitable speed) //SPIBR = 0x10; // Divide bus clock 16 Mhz, spi clock 5,33Mhz SPIBR = 0x11; // Divide bus clock 16 Mhz, spi clock 4 Mhz // Clear status flags by reading SPIS and SPID (void)SPIS; (void)SPID; enable_interrupts(); } void SPI_vSendByte(UB__8 ubSpiTransfer, UB__8 ubSpiChannel) { volatile UB__8 ubAisStatus; volatile UB__8 ubA

Hi all, I’m working on a project using the STEVAL-STWINBX1, and my main goal is to use the IIS3DWB vibration sensor as a high-speed vibrometer. I’m still pretty new to embedded programming (about 2 months in), so please bear with me! Project setup so far: Board: STEVAL-STWINBX1 (STM32U585AI MCU) Using: Only the IIS3DWB vibration sensor (not the other sensors for now) Peripherals: SPI2 (for IIS3DWB), UART2 (for debug/streaming), FreeRTOS Goal: Read high-frequency vibration data, and eventually store it for later analysis What I’ve tried: I set up IIS3DWB via SPI2 and am running it at the full 26.7 kHz ODR (output data rate). Because the data rate is so high, using an interrupt for every data-ready signal floods the CPU. To handle this, I enabled the IIS3DWB internal FIFO (3KB, ~200 samples), set

Hi,I am working on an accelerometer interrupt using the LSM6DSM. In AN4987 I found that I can configure the slope filter to use a window of WK_DUR samples that consecutively exceed WK_THS based on the given formula. I found good threshold settings for the slope filter, but that required me to filter out unwanted interrupts using the WAKE_UP_SRC (if X_WU or Y_WY and not Z_WU) after an interrupt. Is there a way to use a binary operator to filter out interrupts on an hardware level?That lead me to believe that I would need to use the high-pass filter. However, it is not explicitly stated how exactly the wake-up interrupt behaves, the only clue that I found was the following statement:"The wake-up interrupt signal is generated if a certain number of consecutive filtered data exceed the configured threshold". Would that be for a given window (WK_DUR) that every sample should exceed WK_THS compared against the previous sample?Thanks,Bart

Hello ST engineer, our company is currently using your iis3dwb MEMS sensor. We have encountered an issue where we have found that its sampling rate is not the standard 26667 in different environments and varies depending on temperature. Additionally, during frequency domain conversion, the frequency spectrum waveform is shifted due to inaccurate sampling rate input. Do you have a solution to this problem? We have tried linear interpolation, but the effect has been poor. 

Hello,Could you provide the bias instability of ISM330DLC and LSM6DSV I could not find them in their datasheet ?Thank you by advance for your help

In the datasheet at page 13, the sensitivity is of 2096 LSB/hPa instead of 2048.

The measurement data of LIS2MDL was read in the application. Both the Y and Z axes were normal, and their data changed with the position. However, the data of the X axis was abnormal, and its value was the same as TEMP_OUT. Moreover, it was not related to the position. As shown in the screenshot below.                                 Chip settings: CFG_REG_A = 0X80Dear friends, could you please help me figure out what the problem is?

Hello Community,I am currently developing a medical device and am utilizing the LSM6DSOX IMU sensor for user activity tracking. My goal is to implement functionality that can accurately track activities such as running, walking, and being steady.To achieve this, I’ve started by working with the MLC (Machine Learning Core) example provided in the ST GitHub repository. However, despite my efforts, we are not getting any output from the implementation.Could anyone provide guidance or suggestions on the following:Steps for implementing user activity tracking with the LSM6DSOX IMU sensor, specific

Hello, it's code correct for  testing WHO_I_AM? LED doesn't work  #define LIS3DH_CS_LOW() HAL_GPIO_WritePin(GPIOE, GPIO_PIN_3, GPIO_PIN_RESET) #define LIS3DH_CS_HIGH() HAL_GPIO_WritePin(GPIOE, GPIO_PIN_3, GPIO_PIN_SET) #define LIS3DH_WHO_AM_I_REG 0x0F #define LIS3DH_READ_CMD 0x80 uint8_t LIS3DH_ReadWhoAmI(void) { uint8_t txData = LIS3DH_WHO_AM_I_REG | LIS3DH_READ_CMD; uint8_t rxData = 0; LIS3DH_CS_LOW(); HAL_SPI_Transmit(&hspi1, &txData, 1, HAL_MAX_DELAY); HAL_SPI_Receive(&hspi1, &rxData, 2, HAL_MAX_DELAY); LIS3DH_CS_HIGH(); if (rxData == 0x33) { HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12, GPIO_PIN_SET); } return rxData; }  

Hello,I use the STEVAL-MKI209V1K with the IIS2ILCX sensor. I am trying to get the IIS2ILCX communicating with a second IIS2ILCX via sensor hub. The master sensor is connected to my MCU via SPI. Please find my „schematic“ and the configuration code below.My problem is, that I cannot observe any I2C communication between the sensors. My oscilloscope just shows 3.4 V for each SCL and SDA. What could be wrong?I would greatly appreciate any suggestions. Additional information: i want to read the slaves data triggered by DRDY-Interrupt to get synchronized data of both sensors.accelerometer_write_register(accel, ACCEL_IIS2ILCX_REG_ADDR_FUNC_CFG_ACCESS, 0x00); accelerometer_write_register(accel, ACCEL_IIS2ILCX_REG_ADDR_FIFO_CTRL1, 0x7F); accelerometer_write_register(accel, ACCEL_IIS2ILCX_REG_ADDR_FIFO_CTRL2, 0x00); accelerometer_write_register(accel, ACCEL_IIS2ILCX_REG_ADDR_FIFO_CTRL3, 0x07); accelerom

I need to implement the  clock wise motion using the sensor like LIS3DH accelerometer with i2c protocol. Using NUCLEO-L031K6 Board. I don't know how to implement . If you have any reference. Please share it.    Thank you.

Hi,I see the following markings on IIS2DLPC.1) Dot - to identify the correct orientation of sensor2) 2D code - could be for traceability3 a letter "T"What does this letter "T" mean?Thank you!

Hi All,   I am working on a design that has been working for years. Now we wanted to design a revision of the PCB with the LSM6DS3TR but sadly it became obsolete and I can't find it back on the website of ST.Could the LSM6DS3TR-C be a Drop-In-Replacement for this part or another type? Thanks in advance & kind regards,

I am having STEVAL-STWINKT1 to be interfaced on USB channel for ST MEMS PC application.I have flashed DATALOG2_Release.bin in eval kit.I can get the ST MEMS PC Application showing the vibration sensor analysis graph. See attached.However, the issue I am facing is when the ST Eval board is moved from the desk to up in the air (only 1 cm). The firmware is hung, and the USB connection is lost. Can you suggest what is wrong with the firwmare?Also, if possible, I would like to connect the kit BLE channel with the ST MEMS application but it does not connect even then on MEMS applicaiton. Can you sugg

Hello ST Team,I am curious to know how LSM6DSV32X Accelerometers sensor communication takes place.So, basically what I am trying to understand here is when Master assigns some dynamic address to LSM6DSV32X Accelerometers sensor, then where exactly the sensor stores it?Do we have any sensor register for the same? Thanks & regards,Sourav