MEMS (sensors)

Hello,I'm evaluating the LIS2DE12 accelerometer by using the combination of STEVAL-MKI175V1 and STEVAL-MKI109V3 along a Power Profiler Kit II from Nordic Semiconductors for current measurement.Method of test:I removed the jumper that source VDD, bridged the Power Profiler Kit II (2 red circles) and connected GND (yellow circle) Placed the STEVAL-MKI175V1 and connected it to the computer.

Hi,I am working with ASM330lhh, connected to my linux device via i2c.in the sysfs i can see the device with the command  "ls -l /sys/bus/iio/devices/iio:device1/"  that return:total 0 -r--r--r-- 1 root root 4096 Mar 24 14:21 consumers -rw-r--r-- 1 root root 4096 Mar 24 14:21 current_timestamp_clock -r--r--r-- 1 root root 4096 Mar 24 14:21 dev drwxr-xr-x 2 root root 0 Mar 24 14:21 events --w------- 1 root root 4096 Mar 24 14:21 hwfifo_flush -rw-r--r-- 1 root root 4096 Mar 24 14:21 hwfifo_watermark -r--r--r-- 1 root root 4096 Mar 24 14:21 hwfifo_watermark_max -r--r--r-- 1 root root 4096 Mar 24 14:21 in_anglvel_scale_available -rw-r--r-- 1 root root 4096 Mar 24 14:21 in_anglvel_x_raw -rw-r--r-- 1 root root 4096 Mar 24 14:21 in_anglvel_x_scale -rw-r--r-- 1 root root 4096 Mar 24 1

I possese STEVAL-STWINMA2 with STEVAL-STWINKT1B for ultrasonic measurements. As a setup, we have attached STWINMA2 to STEVAL-STWINKT1B and installed a software "X-CUBE- MEMSMIC1". Then, we took measurements with using UltrasoundFFT.exe in the SW_executable file of the software, However every time I try, the only one data of the first attemption goes in to the 'Acquistitions' file, and the other results do not show up there. I never failed to check the box of 'save file'. I guess that even the content of  the only data that I got does not change at all. Even thouth I attempted to restart either my computer or STEVAL-STWINKT1B, it still does not work. I would like you to give me any advices if you have an idea of cause of the problem. Also, I would appreciat that I ever have an oppotunity where you indicate me how to use  STEVAL-STWINMA2 properly.  

Hi everyone,I'm working on a project which we use nucleo401re board and IKS01A2 mems expansion board. I mounted IKS01A2 on 401RE board properly and load the datalogterminal.bin file into the microcontroller. After i start unicleo, it connects to the board but does not allow to hit start button. There is nothing on the unicleo screen but it says connected to the board. At first connection it started once but after that i can not start the communication any more.Thank you.

Hi,I'm having a hard time to find a supplier for an o-ring to get the ILPS28QSW sensor waterproof.In AN5937 ST mentioned they use an o-ring with: ID 1.8mm, thickness 0.5mm (see picture below)Does anyone here know any supplier who make these, or have used another size with good results? For example if a thickness of 0.75mm would work? I'm afraid the o-ring might be to big?And FYI: The cylinder formed hole for the sensor is very similar to the one ST is using in AN5937  O-ring from AN5937:Dimensions of the ILPS28QSW from the datasheet:

Hi all, I was just wondering if anyone had some insight into what the Unico-GUI is looking for to identify a board before it makes a connection. Is it simply looking for a specific formatting of serial output information or does it need to identify the board somehow? I have made some custom firmware for my STEVAL-MKI109V3 board with the STEVAL-MKI227KA sensor board and want to see the data being output via Serial Output manipulated in Unico-GUI. I can see the data in TeraTerm but Unico-GUI simply says "Board not identified". Thanks in advance. 

Hi, do you have any suggestion of a mechanical test bench setup to verify (/evaluate) the chosen accelerometer parameters? I'm working with an LIS2DW12, but I expect my question applies to all accelerometers:I have configured the accelerometer to send me an interrupt as a certain threshold condition is fulfilled (INT1_WU enabled).I use my device in a situation in which, in my opinion, the threshold condition is fulfilled. Nonetheless, the accelerometer does not wake up. Note, the accelerometer can wake up, but only in the event of a stronger acceleration. In other words there is no electrical/mechanical problem with the device itself.Therefore, I see several possible culpritseither the acceleration in the real world situation is below my threshold (in which case I would have to lower the threshold(*)); and/orthe above-threshold value happens too shortly, so that the

I just received the STEVAL-MKI109V3 kit and it appears to be useless so far.The Unico-GUI tool sees the main board but cannot see the sensor plugged into it. I measured the VDD_DUT and VDDDIO_DUT nets and there is no voltage. But maybe that is supposed to be enabled by the gui app?I tried to update the firmware on this board as well and the CubeProgrammer just says the file exceeds the device size or something like that. Anything else I should try before returning this thing?

Hi,We are using LSM6dsox for motion detection and as pedometer. The step counter value gets incremented when travelling in vehicles. FP_REJECTION and ADVANCE DETECTION is not enabled because the current consumption is very high when we enable the MLC core. Overall system current without MLC enable : 60-70uAWith MLC enable : 500-600 uA.We are using wake-up interrupt and step count interrupt for application. How to improve the pedometer without higher power consumption?Thanks,Vishnu

I have a STM32F407G-disc1 board and i have been trying to get readings from its onboard accelerometer LIS3DSH using bsp library of Stm32F4 Discovery. The initialization went fine but the accel readings didnt make any sense. Here's some of my code:       /* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2024 STMicroelectronics. * All rights reserved. * * This software is licensed under terms that can be found in the LICENSE file * in the root directory of this software component. * If no LICENSE file comes with this software, it is provided AS-IS. * ****************************************************************************** */ /* USER CODE END Header */ /* Incl

Hi all, I am trying to program my LSM6DSV16X sensor to operate with its embedded SFLP capabilities. The datasheet for the sensor describes there being three sensor fusion performance operating regions: static accuracy, low dynamic accuracy, and high dynamic accuracy. Is there a configuration of the LSM6DSV16X sensor that is best suited to facilitate each of the accuracy modes, specifically I am interested in the Low Dynamic Accuracy region of operation? Is there an ideal configuration to achieve this operational accuracy? Or are these more guidelines as to how the accuracy of the board will react to different speeds of motion regardless of the configuration of the board? 

Hi,I'm building a program to continuously get data from accelerometer LSM6DS3I'm writing in Micropython under a PYboard v1.1 over its SPI (speed 525000kbits/s)I want to log continuously log gyro and accelerometer to sd cardTo debug, I have configured the LSM6DS3 to fill its FIFO at 26hz (Accel n Gyro are also set to 26hz (high performance))So that I use interrupt INT1 to tell PYboard FIFO threshold (FIFO FTH) has reached a certain amount of data (516 or 1032 words) and then write those data onto the SDcard...Here is what I can see when I plot Gyros and Accelerometers Datas.....First LSM6DS3 is stand still on a plate, then I can see some kind of pattern on signals, this pattern is the exact period of FIFO FTH !!!! How can it be ???? (figure : FIFO FTH = 1032words of data, so 1032/6 = 172, spikes appears every 172 samples) We get the same with half FIFO FTH (516words, spikes appears every 86 samples )

I am using the IIS3DWB sensor and have a question about reading data from the FIFO.Currently, I use the following function to retrieve one set of x, y, z values at a time:int32_t iis3dwb_fifo_out_raw_get(stmdev_ctx_t *ctx, uint8_t *buff){int32_t ret;ret = iis3dwb_read_reg(ctx, IIS3DWB_FIFO_DATA_OUT_X_L, buff, 6);return ret;}If I want to retrieve 1024 sets of data at once, can I modify it like this:ret = iis3dwb_read_reg(ctx, IIS3DWB_FIFO_DATA_OUT_X_L, buff, 1024 * 6);Will this allow the SPI to fetch all 1024 sets of data in a single cycle?Additionally, I am using the sensor's FIFO feature with an ODR set to ODR/10, resulting in approximately a 2.6 kHz data FIFO buffer rate. I am interested in reading the buffer data at once when the COUNTER_BDR_IA flag is enabled. 

What is self-test in IIS3DWB and what is the criteria to indicate pass or fail??

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

Hi @Federica Bossi , I need help with setting LSM6DSO sensor hub i2c master clock speed. How do I set the master i2c clock speed between LSM6DSO and external sensor for sensor hub operation? Is there registers or something else on LSM6DSO that controls master i2c clock speed between external sensors? If there is anything I am mistaken about, please do correct me.Thanks,

HiWhat is the cut-off frequency of the analog anti-aliasing filter in the ISM330IS?RegardsChristoffer Brodersen

Hello,I have question please, can you tell me the protection index (IP) of the LPS28DFW ? also the LPS22DF has 22000g High shock survivability, it's perfromant for my application but for the LPS28DFW i don't find any information on the datasheet about the High shock survivability.Can you tell me if the 2 sensors have the same High shock survivability or not ? Thank you very much 

Hello,Please, for a pressure measurement in an environment of dust and humidity, which sensor between the 2 you recommend as well as what is the IP protection rating of each sensor.Thanks in advance

Hi,I am using the Lis2dh12 mems accelerometer sensor in a design. I configured it for a g-force threshold within any of the 3 axes and using the interrupt (pin 1) with the stream to fifo setting. I am using the I2c (400kbps) and ODR is 100 hz. When the interrupt trips the "threshold exceeding" sample always appear near the end of the fifo dump. This is listed in the manual as the correct behavior.However, my question is the following: Is there a way to configure the device so the sample that exceeds the threshold appears in the "middle" of the fifo dump?. In that way, I can have the data before and after the threshold event. Thanks DerrickEz

I have performed the self-test on LSM6DSL and observed that it was noted the thresholds mentioned in the datasheet I want to know how these values of  90mg > xxx < 170mg  & 150 dps> xxx <700dps measured?Why does the acceleration and gyro change when put in self test mode?   

Hi all, I'm trying to get some accurate orientation data from the accelerometer and gyroscopic capabilities of the LSM6DSV16X, but am getting some different data from different GUI software. The Unicleo-GUI paired with the STEVAL-MKBOXPRO (SensorTile.box PRO) when programmed through the Algo-Builder will give a gravity vector reading and Euler Angle readings which are susceptible to linear acceleration (something independent of 3D orientation). The Sensor Fusion display would also move in response to linear acceleration on a plane even though there was no change in orientation. The Unico-GUI on the other hand, when paired with the STEVAL-MK1109V3 board mounted with the STEVAL-MKI227KA (carrying the LSM6DSV16X), did not present the same unwanted response to linear acceleration and provided a clear and clean independent representation with little irregularities in the Sensor Fusion visualization either. What might be the cause of the difference between the two GUIs since i

Hi,I am using steval MKI160V1 coupled with pybv1.0 under microphyton (spi speed 525000bits/s).I'd like to get every samples from gyro and accel at 1666 hertz speed using interruption.I have configured lsm6ds3( whoami = 69h) to do so, but while I am flushing every samples reading fifo_status1 n 2 registers to know the entire of unread words in fifo, there sometimes a "rebound like" of interruption coming next to the previous one !Why is the documentation saying (page 31/112 5.4.3. continuous mode) that it is possible to route FIFO_STATUS2 (3Bh) (FTH) to the INT1 pin by writing in register INT1_CTRL (0Dh) (INT1_FTH) = ‘1FIFO_STATUS2 is only one byte long while FTH can contain size of 2^12 words of data ?I am not sure of the correct use of FTH neither interruption for this project ?To have a better look at what appends I have reduced odr to 26hertz...Thx for your help  &nb

As shematic below the pin7 is connected to GND so there will be a 60uA leakage .so how to disable the internal pull up by config the register.    

Hello,I've been working on editing in expert Mode the MEMS Sensor Fusion function, and I've added to the Bluetooth streaming also the USB streaming. In this way thank to Tera Term I'm able to read not only quaternions but also accelerometer, gyroscope, and magnetometer measurements. Instead via Bluetooth I can only view quaternions. My ultimate goal is to transmit all three measurements (acceleration, gyroscope, magnetometer) as well as the precomputed quaternions via BLE (Bluetooth Low Energy). This data have to reach a mobile app. Could someone please provide guidance on how to achieve this?Thank you very much for your assistance.Best regards, Claudio