MEMS (sensors)

Hello everyone,We have successfully setup MotionMC lib in our project in order to calibrate the magnometer embedded in the MPU9250 IMU chip. When the board is turned on, after 15-45 sec (depending on rotating the board), MotionMC calculates the soft&hard iron coefficients. In fact, it calibrates our sensor perfectly.The problem is that it is done only once after turning the board on while it should always calculate and update the values. My question is how can we force MotionMC to updates its parameter, espacially when devices is moved to new environment when Electromagnetic field is changed hugely in real-time (without reset/turning the board off) /* Current implementation */   while(true) { if(HAL_GetTick() % 50 == 0) { // Read Magnometerdata // MotionMC_Update(&data_in); // MotionMC_GetCalParams(&data_out); // MotionMC_manager_compensate(&MagValue, &MagComp); } }

Hello Community,I am working on a machine learning project and I am using an accelerometer sensor "STEVAL-MKI190v1". The board description and documentation can be found on this link The driver files for it is available on this github link. Now I have my example working with a STM Nucleo board with mbed OS on it.I want to take it further and link it to raspberry pi directly. I want to connect the sensor board directly to raspberry pi and read the accelerometer data via serial port. My wuestion is is that possible ? If yes how? I went throught web but there are no pythonic support that

The current script in BlueSTSDK examples (https://github.com/STMicroelectronics/BlueSTSDK_Python) needs to be run as root to scan for bluetooth devices in the vicinity. Question is if it is possible to connect to a bluetooth device and receive data without root access.Warm regards,Aditi Prakash

Hi, I'm using the STEVAL-STWINKT1B development board to read the iis3dwb accellerometer and write to the sd as in the HSdatalog example.To do this I use freertos and fatfs.I created the project first on CubeMx where I set the parameters to read SPI, write and read from SD and activated the interrupts for the accelerometer pion.To do this I created 2 threads and used 2 semaphores as shown in the example below./* Definitions for defaultTask */osThreadId_t defaultTaskHandle;const osThreadAttr_t defaultTask_attributes = { .name = "defaultTask", .stack_size = 256 * 4, .priority = (osPriority_t) osPriorityNormal,};/* Definitions for myTask02 */osThreadId_t myTask02Handle;const osThreadAttr_t myTask02_attributes = { .name = "myTask02", .stack_size = 256 * 4, .priority = (osPriority_t) osPriorityLow,};/

Hardware: SensorTile.boxThe project readme.txt file suggests that the software should start from the memory address 0x08004000 in FLASH. How can I change this when I am downloading the software from the Android app? The board has to be restarted after the software is downloaded on the sensor, can I eliminate this restart process in any way?RegardsAditi Prakash

Can someone please tell me the sequence and list of registers / bits I need to touch to get this device into 3 wire SPI mode?....I am monitoring it on a logic analyzer and continue to see the data from the device on the MISO line....I am running at 4MHz and am set to CPOL = 1, CPHA = 1 (mode 3). I can write to the WHO_AM_I and get back the correct value 0x69 on the MISO line.....BUT I need to operate this in 3 wire mode (ie data returned to CPU on MOSI).The sequence (or where I am at now is):WReg 0x12WValue 0x08 (turn SPI 3 wire on, disable auto increment address)WReg 0x13WValue 0x04 (disable I2C enable SPI)RReg 0x0F | 0x80send 0x00 (produces clocks)data on MOSI but now it reads 0x41???BTW....I switched register 12 and 13 above and it didn't make a differenceThanks

Hello experts,I'm trying to determine if the ASM330LHH IMU can eliminate false positives by itself or if the MCU will need to address them. I've searched the forum for this topic and didn't find anything specifically related to this device. Apologies if I missed any.I did read through the ASM330LHH: Automotive inertial module digital 3D accelerometer and digital 3D gyroscope app note (AN5296). It is a helpful document, but I didn't find much about how to prevent or handle false detections.Page 30 includes the following sentence that indicates that false det

Dear @Imen DAHMEN​ ,Is there any plan to have the PDM2PCM library in the Middleware for STM32WL microcontrollers?Thank you much.

Hi, I was looking at LIS2DE12 and I am aware that it can send a wakeup signal to the CPU. In my design I want to enable the power on PMIC chip directly through its enable pin. So I want to do something like this:Shake the deviceLIS2DE12 sets its pin to 1 (3V)this pin in is connected to PMIC which now powers up the main CPUwhen the device is not moving the main CPU sets the reset signal to LIS2DE12LIS2DE12 sets its pin to 0 (0V)PMIC powers down the CPUI read about latching INT1 & INT2 in the specification paper but I am not sure this means this. I also found https://community.st.com/s/question/0D53W000012QA5NSAW/lis2de12-interrup-on-wakeup but I am not sure if the same case is described there.Is it possible to make such operation? Just set some pi

I just want to measure the translational acceleration and wipe out the effect of gravitational acceleration from the accelerometer reading. I know this can't be done with accelerometer alone, but can it be done with MotionDI library which uses both the accelerometer and gyroscope?In the output of MotionDI library, there is a gravitational vector which shows gravitation in three axes. How does MotionDI compute the direction and intensity of gravity when it computes the effect of only accelerometer and gyro and ignore magnetometer.Sensortile kit STLKT01V1 is being used.

I'm trying to convert a PDM data stream from a MEMS microphone into PCM. I think I managed to get a code working and now I want to verify that the acquisition is good. In my test code, I store all the PCM data into "uint16_t pcm_data[30000];"While in debug mode, I can go into Live expression and see the data getting stored into pcm_data. Now I'd like to import pcm_data in my computer and check it using something like Audacity, but I can't find an easy way to do it. What solution do you recommend ?

Hello Community,We have been using the IIS3DWBTR sensor for some time and have observed some odd behavior regarding filters. We recently performed some experimental tests on the LPF2 Filter to corroborate the frequency response curves on page 20 of the datasheet and found that it didn’t behave as intended. Oddly, we found that (experimental artifacts aside) the experimental curve had a better match with the *next* filter cutoff configuration. For example, the experimental results when configuring LPF2 with a cutoff frequency of ODR/20 has a good match with the theoretical curve for a cutoff of ODR/10, as shown in the next plots (yellow is theoretical, blue is experimental).Theoretical response on page 20:

I want to connect a MEMS microphone to my stm32 using its SAI interface. I found a document called "Interfacing PDM digital microphones using STM32 MCUs and MPUs" which gives some examples about how to do it.My question is about the configuration :Why is number of slots equal to 4 ? I dont understand what this parameter represents.In this example, the data size is set to 16 bits and frame length to 64 bits (with free protocol mode).

I'm trying to get data from PDM microphone and convert it to PCM data. This is my first project on stm32 and I'm starting to debug the project. Could you take a quick look at my code and say if you notice something wrong ? Some part of the code come from other project that have been shared here.#include "main.h"   #include "pdm2pcm_glo.h"   #include "stdio.h"     /* Private variables ---------------------------------------------------------*/   SAI_HandleTypeDef hsai_BlockA1;   DMA_HandleTypeDef hdma_sai1_a;     UART_HandleTypeDef huart1;     PCD_HandleTypeDef hpcd_USB_FS;     /* Private function prototypes -----------------------------------------------*/   void SystemClock_Config(void);   void PeriphCommonClock_Config(void);   static void MX_GPIO_Init(void);   static void MX_USART1_UART_Init(void);   static void MX_DMA_Init(void);   static void MX_USB_PCD_Init(v

I'm using a stm32wb55RG. I'm trying to get data from a MEMS PDM microphone and convert it into PCM data. I'm using SAI PDM interface and DMA. So far, I think I manage to receive the PDM data (I get some values from the SAI interface) :I don't know if these values make a sense or not. But when I try to convert these data into PCM using PDM_Filter, I can't get any value in the output buffer.I provide the code :#include "main.h" #include "pdm2pcm_glo.h" #include "stdio.h"   /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */   /* USER CODE END Includes */   /* Private typedef --------------------------------------------------

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Sensortile kit is used and linear acceleration is fused output from gyroscope and accelerometer,the sensor is kept with z-axis of accelerometer being parallel to gravity (screenshot attached).

I would like to know what I am doing wrong or what register setting on the LSM6DSM that I missed setting?Using a sensorTile (STM32L476JG) that is connected to LSM6DSM. APB1 Clk = 16MHz.My settings are : My code is trying to read WHO_AM_I register on the part, I get 0xC5 , should get 0x6A. HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET); txBuf[0] = 0x12; txBuf[1] = 0x08; HAL_SPI_Transmit(&hspi2, txBuf, 2, 50); HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET);   /* * disable i2c */ HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET); txBuf[0] = 0x13; txBuf[1] = 0x04; HAL_SPI_Transmit(&hspi2, txBuf, 2, 50

Hello, community,I would like to use the 6-axis fusion algorithm available in the MotionFX library. I implemented it following a sample application and library MotionFX User manual. The flow chart should be the same as the manual. I don't understand why the output of the fusion algorithm provides coherent information only about the roll and pitch angle, the yaw angle is not consistent with the physical reality. What could be the cause?In the manual, it is said that:- the roll angle range is from -90 to +90- the range of the pitch angle + -180 +180- the range of the yaw angle is 0-360.If I visualize or plot the first two angles, what I see is consistent with physical reality.Instead, the yaw angle does not respond as I expect. In particular, I see, that when I rotate my IMU about 40° around the z-axis, the algorithm say me that a 360 ° rotation occurs, then if I rotate physically the IMU about 360°, t

Hello everyone,I want to use the LIS3MDL Magnetometer sensor in the picture with a NUCLEO-L053R8 board with an I2C interface.I want to set the sensor to output an Interrupt.My question is: Can I do this, using the Official X-Cube-MEMS1 library? Is there a video or document that explains this?

Hello,I'm currently trying out different configurations of the ISM330DLC sensor hub. Everything works as expected as long as I don't configure it to read more than 12 registers. If I do try to use more than 12 registers, I get some unexpected output in registers SENSORHUB13_REG to SENSORHUB18_REG. It seems like consecutive registers are set to identical values. This happens regardless of the type of sensor I'm trying to read.For example, if I configure the sensor hub to read the same LPS22HH pressure sensor data (3 bytes pressure and 2 bytes temperature) three times (slaves 0-2), I would expect the sensor hub output registers to contain the same five bytes three times. However, for the second block of registers (13-18), this is not the case. Example:External sensor: Slave 0 SENSORHUB*_REG: 1 2 3 4 5 0x88 0xed 0x3d 0x71 0x8   External sensor: Slave 1 SENSORHUB*_REG: 6 7 8 9 10 0x88 0xed 0x3d 0x71 0x8   External sensor:

Hello....I am trying to communicate with the above subject but I am not sure what CPOL and CPHA should be set to. STM uses MODE1 - 4 but SPI talks about MODE 0 - 1. I have the following basic code to just try and read the WHO_AM_I Register (0x15) which should return 0x6A. I am using an ST sensortile which is too small to get a logic analyzer on it to see what is going on. My code is pretty basic....I have tried all the variants of CPOL and CPHA and only get 0 or 255 back. Can someone please tell me what I am doing wrong? (using an STM32L476JG) HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET); /* USER CODE END 2 */   /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET); HAL_SPI_Transmit(&hspi2, (uint8_t *)&WHO_AM_I, 1, 100); HAL_SPI_Receive(&hspi2, (uint8_t *)&spiValue, 1, 100); HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET)

I want to set a certain threshold on an accelerometer and have it generate an IRQ. Do both of these accelerometers allow me to do this?Is one better than the other for this application and if so why?Thank you

I want to use the sensor in on of out devices to measure the obtacle in a given threshold range and was wondering if it can be used outdoors, how about covering this sensor with some coated glass ? will that work? Please suggest so we can finalize the sensor t hat can suit for us. we need to measure a distance between 10cm to 60cm range for various events. Hence if their are other on chip based sensor boards we can use please let me know.

I have configured the LSM6SDM into continuous mode, 104Hz as is described in AN487, Example 1. I am reading first the number of words in the FIFO, and then the FIFO Pattern (from FIFO Status 3).Here are some code snippet for initialization:unsigned char init[6][2]={{0x08,0x09}, // FIFO_CTRL3 set to no decimation (accel+gyro){0x0a,0x26}, // FIFO_CTRL5 set to continuous mode, 104 Hz (accel+gyro){0x10,0x40}, // CTRL1_XL set to 104Hz, +/- 2g, ODR/2{0x11,0x42}, // CTRL2_G set to 104Hz, +/- 125 dps{0x12,0x44}, // CTRL3_C set to BDU + IF_INC{0x14,0x60}}; // CTRL5_C set to rounding for accel+gyrofor (i=0;i<6;++i) write(i2c_fd,&init[i][0],2);Roughly every 100ms I call a function which does the following:write(i2c_fd,&fs1,1); // Read FIFO_STATUS1read(i2c_fd,data,2);numsamples=((data[1]&7)<<8)+data[0];if ((data[1]&64)==64) numsamples=1023