MEMS (sensors)

Hi,everyone.I measured the power consumption of LIS2MDLTR on the same board in power-down mode.and found that the LIS2MDL chip on STEVAL-MKI217V1(from mouser) consumes less power than the LIS2MDL purchased separately from mouser.We have some question and need your help.​ What is the power consumption LIS2MDL in power-down mode ？  Why do the parameter differ between LIS2MDL chip on STEVAL-MKI217V1 and LIS2MDL purchased separately？

Hi!We are working on product that needs to count people on the range of 3-4 meters. We designed dev.board for sths34pf80 and tetsted it with UNICO-GUI. The max range that we are getting is around two meters and therefore it looks that we need to use additional lens to extend the range.  I found one of your documentation " New industrial sensors:anomaly detection and presence" where you have descibed it working together with a lens. So we bought the same lens IML-0687 and tested it, but we are not reproduce the same results. With a lens the range is even less than without it. I played with different settings, but no success. There also should be document  AN5983, that describes the work with lens, but looks like its not created yet. Have you got any suggestions for us, to get it work?   

Hi,I'm trying to write custom firmware for the MKI109D. I am currently using an MKI251A adapter board with it for evaluation. How do I set VDD_DUT and VDDIO_DUT to 3.3V on the MKI109D board without using MEMS Studio?   

Hi, In the datasheet of the gyroscope I3G4250D, page 21:CS: 0: SPI communication mode / I2C disabledMy question is: I have to configure the CS pin PE3 as Low at the beginning to make the gyroscope understands that I wants to use SPI? (PE3 is CS in the KIT STM32F411 Discovery)  Wating for your response,Thank you very much. 

 LSM6DSVTR is marked V3,Does it change the DC format from YWW to Y or another format? What does "4" mean?Thank you.

The X-NUCLEO IKS4A1 cannot operate correctly in MEMS Studio with the default sensor selection on the board. I have the nucleo f401re.

I designed a fsm Design for high G application. The odr of high G and fsm are same. The said functionality is generating interrupt when done on eval kit Nucleo board with iks4a1 kit in Mems studio. But when I converted it into header file and loaded in another sensor board with lsm6dsv320. It is not working. Earlier Free fall Fsm was done on same sensor, it worked both in mems and on this sensor board. I have called the fsm load function and enabled the embedded interrupt in MD2_CFG as I am generating interrupt on int 2. Odr and range settings of high G have been done seperately. What can be the reason of non functioning. 

The STAR1 laser beam scanning reference design was created as a technology demonstrator, and many of its original components are now outdated or no longer commercially available. To reproduce the design today, the focus should be on replicating the overall system architecture rather than sourcing identical parts.Modern MEMS or piezoelectric scanning mirrors can be used as replacements, along with updated mirror driver electronics built using current high-voltage amplifiers or dedicated MEMS driver ICs. STMicroelectronics and similar vendors may offer newer evaluation platforms or reference designs that serve the same purpose as the original STAR1 hardware. For piezo mirror evaluation kits, direct contact with manufacturers or authorized distributors is often required, as these kits are typically provided for development projects.Regarding optical waveguides, many commercial AR waveguide solutions exist today, though access may require NDAs. For prototyping, simpler optical combiners or

Hello, I am currently reading the ASM330LHH May 2020 DocID031239 Rev 4 datasheet and its Chinese version: ASM330LHH: Automotive Inertial Module Digital 3D Accelerometer and Digital 3D Gyroscope User Manual. During the design process, I have a few questions to confirm: Question 1: For CTRL9_XL (18h), when should DEVICE_CONF be set to 1 and when should it be set back to 0? Do I need to set DEVICE_CONF to 1 first before performing any write operation on any register of the ASM330LHH, and then set it back to 0 after all register write operations are completed? If DEVICE_CONF is never set to 1, what impact will this have? Will the written register values fail to take effect? Question 2: In the Chinese version of the ASM330LHH User Manual, Table 8. Accelerometer Samples to Discard, Table 12. Gyroscope Samples to Discard (LPF1 Disabled) and other tables all mention the term "number of samples to discard". What does this mean? How should I handle this—does it need to be implemented in the desi

Hello,I intend to put LIS3DH and LSM6DSV32X on same SPI bus and use different CS lines to address them separately. But when the CS is desactivated, these components activate their I2C engine, therefore leading to possible conflicts of I2C interface on the SPI bus.For LSM6DSV32X, the datasheet states that I2C can be deactivated by setting to 1 the bit I2C_I3C_DISABLE of IF_CFG register.For LIS3DH, iy is said here (https://community.st.com/t5/mems-sensors/use-lis3dh-on-the-same-spi-bus-as-an-eeprom-is-it-possible/td-p/427285) to write 0x80 on address 0x17 to desactivate I2C on LIS3DH.Question 1: this method for LIS3DH is not officially documented in the datasheet, nevertheless, is it an official and safe way to deactivate the I2C bus ?Question 2 : If I deactivate I2C on LIS3DH and LSM6DSV32X, is it a safe way to make both components coexist on a same SPI bus ?Best regardsPierre Prot

On platforms like LCSC and Mouser, an IMU labeled "LSM6DSVQTR" is listed separately from the LSM6DSVTR. On JLCPCB, the LSM6DSVQTR has considerably more stock than the LSM6DSVTR and is eligible for the "economic" PCBA service, unlike the LSM6DSVTR.Do these IMUs have any meaningful differences, or can they be used interchangeably? If they do have differences, are they documented anywhere?

Hello everyone,I am interfacing ADXL345 in stm32f103c8t6 by using I2C connection. I have fixed the set up on a board. I would like to know if I can identify the movement of adxl by observing the changes in x, y, and z values if there is no vibration but the board is moving smoothly, that is, to the right or left. If not, how can I predict when the adxl will go forward or backward without relying on the sensor's tilt or vibration? I just want to create a basic activity detector where the logic would be :1. If the setup does not move, the output should be zero.2. If the setup is vibrating and moving, the output should be one.3. If it is simply vibrating (and not moving in space), the output should be 0.So, basically, I want to detect actual movement and not just vibration noise.I noticed that when the movement is smooth or constant ADXL345 values do not change much, so my logic is not detecting that as “motion.”STM32f103c8t6<-> ADXL345PB6<->SCL     PB

Greetings,I am bring up a new HW design with the IIS2DLPC accelerometer integrated into the design.I am trying to bring up a Linux IIO device driver for this device, and the kernel does not currently have direct support for the IIS2DLPC, however it does support the LIS2DW12, which from looking at thedatasheet for both, they appear to be SW compatible.Can I just code the device tree node to specify the LIS2DW12?accelerometer@18 {compatible = "st,lis2dw12";reg = <0x18>;status = "okay";st,drdy-int-pin = <1>;interrupt-parent = <&sysfpga>;interrupts = <SYSFPGA_INT_ACCELEROMETER>;interrupt-names = "ACCELEROMETER-INT1";};Thanks,Ken 

Hello everyone. I'm a beginner to STM32 and STWIN. I'm experimenting with the DATALOG2 firmware on STWIN.My question is about customizing this firmware. What I want to do is keep the DATALOG2 functionality as-is, but add an extra feature: when the accelerometer value exceeds a certain threshold, output a High signal on a GPIO pin or turn on an LED.(I couldn't find any GPIO pins in the STWIN schematic!) STEVAL-STWINKT1 https://www.st.com/en/evaluation-tools/steval-stwinkt1.html   The firmware is here.GitHub : FP-SNS-DATALOG2 Firmware Package https://github.com/STMicroelectronics/fp-sns-datalog2     Since my development environment is STM32CubeIDE, should I open the .project file within the following STM32CubeIDE directory in the GitHub using CubeIDE and modify the source code there? https://github.com/STMicroelectronics/fp-sns-datalog2/tree/main/Projects/STM32L4R9ZI-STWIN/Applications/DATALOG2/STM32CubeIDE

In HTS221 sensor I have issue that H0_T0_OUT and H1_T0_OUT, H0_RH and H1_RH value is same like belowT0_degC float 20.5T1_degC float 52.5T0_OUT int16_t 1028T1_OUT int16_t 0H0_RH float 29.5H1_RH float 29.5H0_T0_OUT int16_t 0xf7f7 (hex)H1_T0_OUT int16_t 0xf7f7 (hex)This is my codeInit functionuint8_t HTS221_Init(HTS221 *hts221, I2C_HandleTypeDef *hi2c) { hts221->hi2c = hi2c; uint8_t data[2]; if (HTS221_ReadRegister(hts221, HTS221_WHO_AM_I, data, 1) != HAL_OK) { return 1; // Error reading WHO_AM_I register } if (data[0] != HTS221_WHO_AM_I_VALUE) { return 2; // WHO_AM_I value does not match expected value } // Read calibration data if (HTS221_ReadRegister(hts221, CALIB_0, data, 2) != HAL_OK) { return 3; // Error reading calibration data } hts221->H0_RH = (float) (data[0]) / 2.0f; // H0_rH_x2 hts221->H1_RH = (float) (data[1]) / 2.0f; // H1_rH_x2 if (HTS221_ReadRegister(hts221, CALIB_2, data, 2) != HAL_OK) { return 4; // Error reading temperature calibration data

The SDDataLogFileX example stores the wave file for the digital microphone but in the following docs it wrongly say that it store for the analog microphone :UM2626 at pages 15 (2.1.5) and 30 (2.2.6)FP-SNS-STBOX1_Quick_Start_Guide at page 27

Hello everyone, I plan to use the LPS28DFW barometer to measure the final pressure after a drop from 30 atm. I only need to sense the final pressure within the sensor’s specified working range, but I’d like to know whether exposure to the initial 30 atm would cause mechanical damage to the device. Or, at what pressure can I expect the sensor to break?Thanks!

My partner and I are creating an app designed for P2P as well as traditional user/vendor interaction. We need a wearable that can create a mutual event on the back end when the two wearables touch or are in close proximity. I see the ST25R3916 or STM32 chips may be suitable but wondering if there’s already a wearable with these capabilities or if one can be designed/created that’s suitable for kids. I also see there’s a wearable - STEVAL-WESU1. Can the STM32 be used in the WESU1? I have additional requirements, like haptics, visual indicators, etc, that I can provide info on but I can’t find a wearable that can create a P2P event. Any help is appreciated

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I have a question regarding how the averaging filter works in the LPS28DFW pressure sensor (AVG[2:0] in CTRL_REG1).I am wondering whether:A) AVG controls internal ADC oversampling for each individual pressure measurement (i.e., multiple internal samples averaged to create one output sample),orB) AVG performs a moving average across multiple output samples after they are generated. In other words, does the AVG setting reduce noise by oversampling within one output period, or does it smooth several consecutive output samples?

I designed a small PCB for LSM6DSV but I got no signal on SPI-MISO and got NACK on I2C-SDA.I have replaced several chips but all the chips have the same behaviour(no signal reply).I'm very sure the SPI and I2C pins are correctly connected to LSM6DSV.(1)Custom PCB designThis is the PCB design of my custom board. All the net label are connected to pads on board. Never mind "LSM6DSOTR" in the schematic. Actually I soldered LSM6DSV on board since LSM6DSV has the same chip package with LSM6DSO.VDDIO and VDD are 3.3V and this board shares the same ground with stm32.(2)SPI communication issueSPI_SCK and SPI_MOSI signal is correct but SPI_MISO has no signal.I configured STM32H743XIH6 SPI in STM32CubeMX like this. No NVIC, no DMA.I implemented the SPI polling read/write function for official ST LSM6DSV driver code. int32_t lsm6dsv_spi_read(void* handle, uint8_t reg, uint8_t *data, uint16_t len) { reg |= 0x80; LL_SPI_SetTransferSize(handle, len+1); LL_SPI_Enable(handle); LL_SPI_StartMas

Hi i have a custom lsm6dsv  module  that is getting  a strange result  after 6a 9c then cycles through  int of the imu 9c seem to make it restart its process  and loop it for a for until 6a is back and 9c comes back and does the exact  same process   and unsure  what i should look at next [ i am new to logic  analyzing oscilloscope   scopes signals  seem fine  i feel like im missing  something  badly  Parts 100nf caps 5.1k resistor  tired  10k but I thought  lower  them could solve it? Before  I do anything  dumb I need input on what could cause this i can also provide logic files from pulse veiw Thanks   

Please tell me about the STATUS_REG for ASM330LHH. I'm using SPI communication. A similar question was posted earlier, but the situation is slightly different.When I ran the same program on 30 board-mounted samples, 29 of them showed a change in STATUS_REG within 400ms after the ASM330LHH setting, but one remained 0 without any change.I'm guessing from this that is not a sowtware problem, but I would appriciate a list of possible factors as the cause.

Hi Team,  We are working with the LSM6DSOX sensor and integrating it with two different MCUs: nRF5340 and ATSAMD51, using the I2C communication protocol. We have been able to successfully read the device ID, accelerometer data, and gyroscope data. Additionally, we've implemented our own logic for step detection and step counting. Recently, we learned about the Machine Learning Core (MLC) feature, which provides useful capabilities like detecting activity states (idle, walk, run). We obtained the .ucf file for MLC, used the UNICO tool to generate the corresponding .h file, and attempted to integrate it into our application. We followed the documentation and tried monitoring the MLC_STATUS (0x70) register to track activity states. Challenges faced: First Attempt with nRF5340 MCU: Initially, we tested the MLC functionality with the nRF5340 MCU using I2C communication. However, when we read the&nbsp

Hello, I am working on adding a pedometer to the Sensorwatch project using this chip.I have the step counter working well, and I also have it working with the LIS2DW. Here's a video of it :)The LIS2DW works by sending 12.5Hz worth of data from its FIFO every second to the host uC, which runs an algorithm to count the steps.I am finding with a Nordic Power Profiler that the LIS2DUX uses about 6uA to run the step counter.The LIS2DW uses nearly 15uA.But I found that I can heavily lower the battery-draw of the LIS2DW by only reading the FIFO and performing the math only if more than 0.06G is seen, which is seen by an interrupt signal, whic make sthe current draw for 90% of the day to be close to 1uA.Can anything be done with the LIS2DUX to bring it closer to that efficiency?The goal of the project is to only need to replace the battery once a year, which means that we'd want no more than an average 2uA draw from the chip. Questions:1) What is the most battery-efficient