MEMS (sensors)

Good dayI am using LSM6DSO with 3V3 VDD and 1V8 VDDIO.Can the supplies(VDD and VDDIO) be ON/OFF independently or is there a requirement for one of the two to be ON before the other?In my instance the VDD might come on before the VDDIO and in other circumstance the VDD might be switched OFF and VDDIO might remain ON.The device functions in I2C mode. Does CS have to be HIGH when VDD is applied or can CS be changed/set dynamically after VDD was applied?Would this pose a problem?Thank you.

Hi All,I started with example to make STHS34PF80 presence detection working.Now I tried to add effective presence detection range.Where should I start ? Is there a suggested process ?  

Hi, I need clarification about interrupt on ILPS22QS barometric pressure sensor.My test project involves LIS3MDL and ILPS22QS connected to MSDA and MSCL on LSM6SDO, which is connected to an mcu in 4-wire SPI interface, to use sensor hub on LSM6DSO (I've only come up with schematics so far). My concern is that LIS3MDL has INT pin that can be used for data ready and ILPS22QS has built-in interrupt generator block according to page 19 on AN5764 but no interrupt pin on the IC, which I am not familiar with. What I want to ask is,1. Is it possible to send data ready signal from ILPS22QS to LSM6DSO for sensor hub operation?2. If yes, is sending data ready signal done through master i2c between ILPS22QS and LSM6DSO in this case, or maybe another pin on ILPS22QS can be used as interrupt pin for DRDY alternatively? If there is anything I am mistaken about, please feel free to correct me.Thank you in adva

Is it possible to configure the LIS2DH12 so that it can receive a clock from the host (master) instead of the clock being generated by the LIS2DH12?  I'm looking a the quality of the LIS2DH generated clock and it is spectrally not pure and has a significant frequency error for my application.  

Hello,I have STEVAL-MKI236A (ASM330LHB - IMU) evaluation board, How can I make use of the UNICO-GUI to interface with the board. I do see the board listed on the GUI but how will I be able to interface with gui with just I2C without using the MOTHERBOARDs.Thanks!

Hi.  I used LIS2DU12TR accelerometer IC on the PCB.  It's angle value  was changing every sec. but my smart phone app indicated current angle is 0.0 degree.    current angle is -0.515648[proc_bt_read_all] TX data (len=15)00 00 02 00 00 00 00 00 00 7F 00 64 37 01 00current angle is -0.865430[proc_bt_read_all] TX data (len=15)00 00 02 00 00 00 00 00 00 7F 00 64 37 01 00current angle is -0.460660[proc_bt_read_all] TX data (len=15)00 00 02 00 00 00 00 00 00 7F 00 64 37 01 00current angle is -0.688205[proc_bt_read_all] TX data (len=15)00 00 02 00 00 00 00 00 00 7F 00 64 37 01 00---------------------------------   How can I set  ODR and FS variables , more accuracy and more stable  this IC ,       LIS2DU12StatusTypeDef L

I want to calculate the displacement using the MotionX library with the LSM6DSR sensor on the stm32. For example, I want to write a code that calculates the displacement when the sensor moves 20 cm to the right on the table or calculates the displacement when it moves 20 cm to the left. As a result of my research, I found the MotionFx library, which belongs to the company ST. My problem is that I use this library. I don't know what functions to use, I would appreciate any help.

When I used the IIC communication mode of h3lis200dl, I connected the 7th pin SDO directly to the ground. Since the SDO pin has a pull-up resistor inside, the current is too large (about 60uA). I would like to ask if there is an unopened register to connect the SDO Is it closed? The product has been sent to the customer and the hardware cannot be changed. I hope someone can help answer it as soon as possible.

I'm using lsm6dsv, and must calibrate IMU everytime after power on. Can I read calibration data once, and restore to IMU without calibration?

Hello Everyone,Kindly provide the details of raw sensor data interpretation method/ formulae to equate for getting the required dataThe following are the steps executed.  Configured the sensor registers as per the data sheet(attached here for your reference).As per the below block diagram the temperature sensor is connected via ADC3 channel higher register, so able to read the raw temperature adc value from this register.

GreetingsI am working with the LIS2DW12 accelerometer and I am struggling to read from, and use the FIFO in single-conversion mode, using i2c. The chip is on a dev board which can only be used with i2c, and the INT1 or INT2 pins are not available for use.I am configuring the chip in low-power 12-bit mode, with an ODR of 50Hz.My configuration function: write(CTRL2_REG, 0x0C) //block data update = 1, device-addr increment = 1 write(CTRL6_REG, 0x00) // filter = ODR/2 write(FIFO_CTRL_REG, 0x20) //fifo mode write(CTRL1_REG, 0x48) // low-power 12-bit mode, with an ODR of 50Hz, single-conversion mode write(CTRL7_REG, 0x20) //enable interrupts To run the chip in single-conversion mode and read from the fifo, the function I have written is as follows: write(CTRL3_REG, 0x02) //enable s

Hello everyone,I am currently working with STWIN+STWINMA2A microphone array for ultrasonic signal processing. I use the firmware "AMicArray_Microphones_Streaming" and connect the board directly to my laptop as an USB microphone.However, the data suffers from significant noise with certain frequencies.I used Audacity to sample the data in an quiet environment, with the configuration as figure 1. The sampling rate is 96kHz.The DFT of 10,000 data points is shown in the next figure, we can see a very high noise level at around 40k, 24k, and 8kHz.

I follow the prompts and no upgrade firmware file is downloaded to my phone.  Please see pictures:

At this point, the I2C statuses all look normal. I have written code to extract temperature and humidity data values via high-resolution single-shot mode, but the data values are not being extracted correctly. Do I need to set the high-speed mode and access write, read before entering single-shot mode? I don't know what the heck is wrong.board:NUCLEOF303K8 / sensor: SHT30DLS, gpio / i2c source and header file is no problem / i2c = fast modeif you help me. i'm will bless to you every every every day... 

Hello, I am trying to test the e-compass application with the IKS4A1 connected to a Nucleo-F446 and Unicleo-GUI. The firmware of the Nucleo F446 was produced from Cube-MX following the "Getting started with the STMicroelectronics X-CUBE-MEMS1 software package for STM32MX".For some unexplainable (to me) reason, it looks like the board looks for sensors placed on another expansion board I don't have so that I am unable to get sensor data from the magnetometer placed on the IKS4A1. The IKS4A1 magnetometer is placed on the right side of the board. I have not the green board shown in the picture and it seems to me I have not configured it. 

I have been experiencing a peculiar issue with the LSM6DSM sensor, where noise occurs at a 12-second interval. This phenomenon is consistent across multiple units and locations. Notably, the noise seems to affect only the Z-axis.Settings: with the ACC in operation and GYR disabled.ODR 52Hz, +/-8G, the filter set to the state closest to RAW,and a FIFO setup with a 3840-byte threshold. The data is not decimated in the FIFO.It appears that the 3840-byte FIFO setting and the 52Hz ODR result in approximately a 12-second cycle. I am curious to understand the root cause of this issue and would appreciate any insights or recommendations for mitigating it.

Hi All,I need a mechanism to detect motionless for 10s to make device enter power saving mode.For lis2dh12, I can use HPF with low x,y,z threshold and duration to detect an event that motionless for 10s.However I need more low power accelerometer lis2dw12 to do same thing but it seems lis2dw12 design can only detect wake up event, is there correct configuration to detect motionless for 10s event ?What I need is:active: Himotionless for > 10s: LoBR,Sam

GreetingsI have configured  the LIS2DW12, via SPI,  to sample and store samples, given the FIFO (configured in continuous mode) on a wakeup interrupt to INT1. The sensor, given its current configuration is able to wake up and sample but there is a worrying issue where, on the first wake-up (providing some movement to the sensor),  the FIFO always overflows. I am seeing this when my ISR fires and the data-read-function is called, and within the read function, I am checking for the overflow and then essentially returning an error. If I try waking it up again, it samples fine without overflow occurring.Any help would be appreciated to figure out why overflow occurs ONLY on the first wake-up.My current configuration is:Write(CTRL2 , 0X1E) //BDU ENABLED, I2C Disabled, IF_ADD_INC EN, Disable CS_PU Write(CTRL6 , 0X10) //enable HPF, ODR/2, FS = 2G Write(WAKE_UP_THS , 0X0C) //Threshold = 375mg Write(WA

Hi all,I am using ST tile box pro and logging IMU orientation data for my test. I

Hello,I need to measure the tilt angles (along the x, y, z axis) of a flying device. What accelerometer can you recommend produced by STM? Will one accelerometer be enough? Or do you still need a gyroscope to complete the task?

I am trying to connect the IMU sensor that is onboard the STEVAL_MKI236AA evaluation board. I am currently trying to connect that board to BeagleBone AI-64 or a basic Arduino via I2C and was able to detect an I2C device as 0x6A and 0x6B as the board has 2 IMU sensors. My current issue is making use of the .c drivers provided by ST on github (https://github.com/STMicroelectronics/asm330lhb-pid/tree/64dab105b84706e68a405678a4b0f10a28d7b489) and using the provided example over here (https://github.com/STMicroelectronics/STMems_Standard_C_drivers/blob/master/asm330lhb_STdC/examples/asm330lhb_read_data_polling.c) can someone

Hello,    I am trying to test the compass of the IKS4A1 board with a Nucleo F446 board. I followed line by line the instructions provided in the "Getting started with the STMicroelectronics X-CUBE-MEMS1 software package for STM32CubeMX". My cube project locks like this:Even if I followed all the steps, it was not perfectly clear how to test the board. Moreover I have to further enable the DMA on Uart2 in order to avoid hard_fault. Then, after havin a running firmware I started Unicleo-GUI but there is any communication with the board. The Getting started say to set the Uart to 115200 but Sniffing the packets it looks like unicle

Hi,I have a custom PCB for my company for automotive purposes with the ASM330LHHX as the IMU. Upon integrating the gyro rate (about the X axis, roll rate, see green line in 1st plot below) while acceleration is happening on the on the Y axis (Ay, see orange trace in second plot below), the purely integrated angle estimate diverges significantly more than it does otherwise without the Ay. This data is from a car driving around sporatically with some significant Ay events in both directions. What is the cause of this behavior from the gyro? Is there a specification that determines how much this behavior occurs, in a standard format of SI units? 

Hello,    I have a custom board with a STM32F373 and a LSM303AGR MEMS device.I made a Cube-MX project in which I included the corresponding x-cube-mems1 software pack with an eCompass application.The project compiles and runs. I see from the firmware it is waiting from commands from uart. So I run the unicleo-GUI and connect to the corresponding port but nothing happen. Is the unicleo-GUI sw intended to run only with the SDK? Is there some other sw I have to use?Thank you.

Hi all,Been trying to use the ULP mode on LSM6DS032 with following steps.1. Setting XL to Power down mode by setting XL_ODR bits to 0b0000  of CTRL1_XL register.2. Set I3C_DISABLE to 1 of  register CTRL9_XL. // Not sure if this is necessary3. Power down the gyroscope by setting ODR_GY bits to 0b0000 of reg CTRL2_G .4. Set XL_HM_MODE = 0 of reg CTRL6_C (15h) // ref Sec 6.2.1 of datasheet.5. Finally, XL_ULP_EN bit to 1 in reg CTRL5_C (14h).Here is the actual problem, considering above steps to be correct for ULP use,the setup I have got has no significant difference in current consumption with any of the modes, be it ULP or power down or normal or low power..The sleep current for the my setup when IMU is turned off with a hard switch is ~0.6mA. However, the sleep current is ~1.2mA in each of the modes with IMU is powered on. I need IMU to be waking interrupt