MEMS (sensors)

Hello Developers,We are developing a predictive maintenance application using ST Mems IIS3DWB sensor with out custom board having Cortex-M4 archichtetcure. Currently we have integrated Motion SP middleware to perform time domain analysis. But as the values are not that accurate with the refernce device readings, so we are trying to calibrate ST Mems IIS3DWB using ST's Motion AC calibration library on our custom board. So we have added the library file in our project, but on enabling the Motion AC library using initialise function the firmware gets stuck.  So i would like to know whether Motion AC library run only on STM32 based boards ? Can the source file be made available for the same for porting it on other platforms ? Also is there any other way of calibrating IIS3DWB sensor.     

I have an application using the XL function, it works fine, no issues.Now I need to read the gyroscope output data.After I finish configuring the registers:CTRL9_XL 01INT1_CTRL 03INT2_CTRL 06CTRL1_XL 30CTRL2_G 32CTRL3_C 04CTRL6_C 80CTRL8_XL 00MD1_CFG 02MD2_CFG 02CTRL9_XL 01I get the 1st interuption. I read the status register and both GDA and XLDA are set.Then I read XL data, followed by gyro data. So far so good. My problem is that I keep getting interrupts for XL but reading the status register, GDA remains 0. I tried to read gyro output but it never changes.Is there something I'm missing?   

Hello,we would like to use the LPS22HHTR barometer sensor in a new product. Now it is not clear from the datasheet how the sensor should be placed in the housing. I have not found a design guide for this product. Are there certain requirements regarding the distance between sensor and housing wall, minimum volume between sensor and housing wall, requirements for the opening used in the housing (e.g. for membranes used, etc.)? Thank you for your prompt feedback. Best regards, Pascal

Good morning,I am having issues with the INT1 pin on the LIS2DH12. I have been trying to make it to work for Watermark, Overrun or ZYXDA, but none of these events trigger any interrupt on the INT1 pin. When polling the Watermark Level, the FIFO Overrun or the new data available register though, I can see that they are working as intended.Here is the configuration code, in case it helps or anyone can see an issue: lis2dh12_block_data_update_set(&dev_ctx, PROPERTY_ENABLE); /* Enable Block Data Update. */ lis2dh12_data_rate_set(&dev_ctx, LIS2DH12_ODR_5kHz376_LP_1kHz344_NM_HP); /* Set Output Data Rate to 1Hz. */ lis2dh12_full_scale_set(&dev_ctx, LIS2DH12_2g); /* Set full scale to 2g. */ //lis2dh12_temperature_meas_set(&dev_ctx, LIS2DH12_TEMP_ENABLE); /* Enable temperature sensor. */ lis2dh12_operating_mode_set(&dev_ctx, LIS2DH12_LP_8bit); /* Set device in continuous mode with 12 bit resol. */ lis2dh12_fifo_mode_set(&dev_ctx, LIS2DH12_BYPASS_MOD

Dear Forum. I use a LIS3DH connected with a Pic mainboard. I cummunicate with I2C and have set it up with interupt. I use 8mg, Lowpower and 50 hz odr. I have a problems with Power Consumption. Before i insert the LIS3DH it use 3 microampere. After i have set it up with interupt i use 100 microampere. We use a STEVAL-MKI105V1 eval board. How can i set it up so it only use 10 micro ampere.    Best regards Bjarne Profort. 

I use the continuous mode of FIFO and set the WATERMASK of FIFO to 2. Then, I route the FIFO threshold interrupt to INT1. In theory, for each set of XL+GY data generated, an interrupt should be generated. Then, I can read a set of XL+GY data in the interrupt handling function. In practical operation, it was found that when a second interrupt was generated and data was read, no new interrupt was generated.The following is the waveform of the INT1 pin that I captured：   Part of the code is as follows:asm330lhh_fifo_sensor_tag_get（&dev_ctx， &reg_tag）;{  if(GPIO_Pin == IMU_INT1_Pin)  {    asm330lhh_fifo_read();  }} void asm330lhh_fifo_init(ASM330LHH_FREQ freq){  /* Uncomment to configure INT 1 */  asm330lhh_pin_int1_route_t int1_route;  dev_ctx.write_reg = (stmdev_write_ptr)platform_write;  dev_ctx.read_reg = platform_read;  dev_ctx.handle = &SENSOR_BUS; 

Hi,I've connected to my Pico via SPI1 an STEVAL-MKI208V1K board with an IIS3DWB vibration sensor and I want to read data from it.I want to compile this driver for RPi Pico RP2040 using VSCode, can I do that? Can I port STM32 C lib for PICO RP2040?

Hi I was looking at how a register read works for LSM6DSLhttps://www.st.com/en/embedded-software/stsw-fcu001.htmlI found the function below. Does the number/amount of __asm("dsb\n") correspond to SPI clk?Is there no easier way to do this? Like using HAL_SPI_TransmitReceive(...)?  /*** @brief This function reads a single byte on SPI 3-wire.* @param xSpiHandle : SPI Handler.* @param val : value.* @retval None*/void SPI_Read(SPI_HandleTypeDef* xSpiHandle, uint8_t *val){/* In master RX mode the clock is automaticaly generated on the SPI enable.So to guarantee the clock generation for only one data, the clock must bedisabled after the first bit and before the latest bit *//* Interrupts should be disabled during this operation */ __disable_irq();//GPIOA->BSRR = (uint32_t)GPIO_PIN_8 << 16U;__HAL_SPI_ENABLE(xSpiHandle);__asm("dsb\n");__asm("dsb\n");__asm("dsb\n");__asm("dsb\n");__asm("dsb\n");__asm("dsb\n");__asm("dsb\n");__asm("dsb\n");__asm("dsb\n");__asm("dsb\n");__asm("d

Hello,I try to use LIS2MDL embedded temperature sensor value, thru TEMP_OUT_L_REG and TEMP_OUT_H_REG. Data is signed 16-bit byte in 2’s complement and 8 LSB / °C. The four mostsignificant bits contain a copy of the sign bit.At room temperature I read 0xFE20, so it is negative, so I convert in positive value with 2’s complement : NOT(0xFE20) + 1 = 480 in decimal. Then I div by 8 and I find 60, so -60°C.What is wrong ?ThanksBest RegardsThomas

Hi,I have STEVAL-MKI109v3 board and steval-mki186v1 sensor. I need some source code or library code which I can use to write a application which meets my requirements. And I also want to know which IDE I should be using to write the application so that I can flash the application on the the evaluation board. Will I be able to use the USB for flashing the code.Please provide some links which might also be useful in learning about the example codes.​Thanks,Akhil​

Hi All,We are implementing a custom PCB which includes an ISS3DWB which sits alongside an EEPROM chip on the same SPI bus. The bus master is a STM32F405. The design will has separate CS pins for each device, chances are the EEPROM will only be communicated with every so often and the primary use of the SPI bus is to get the acceleration data from the IIS3DWB.When the CS pin of the IIS3DWB is held in idle (high) does the SDO pin go high-z and allow other devices (in the case of a multi slave SPI bus) to take control??I know the EEPROM we have chosen (25LC1024) will work on a multi-slave bus.Any pointers would be much appreciated.Cheers all! 

Hi there,After playing around with basic examples for the lsm6dsox sensor i am trying to fine tune its functionality to my exact needs. However the datasheet seems to lack information on these:#1: Does writing the SW_RESET bit of CTRL3_C register reset all the register values to their default values mentioned in table 21?#2: What does this quotation mean: "It is possible to select decimation for timestamp batching in FIFO with a factor of 1, 8, or 32."? (I know what decimation means in general, but not sure what it has to do with timestamp values of the lsm6dsox)#3: What do batch data rates of the gyroscope and accelerometer mean in FIFO_CTRL3 register? 0 means each value is written to the FIFO as soon as sensor output is available? Does batch data rate need to be the same as ODR? Or if batch frequency is 2xODR, then it means that sensor output data is dumped into the FIFO every 2 seconds (in which case there must be some additional buffer which is not documented)?#

I am writing a custom linux driver module to be able to read accelerometer and gyroscope data from the LSM6DS3 FIFO in blocks.I have set the fifo watermark to 512 words, ODR for accel, gyro and FIFO both set to 416Hz. Scale 8G and 250dps. As there is no interrupt line connected to our CPU, the driver polls the FIFO_STATUS2 register every 100ms to check if the FTH bit is set. When it is, it reads the FIFO_STATUS 1/2 to get the number of words in the FIFO, then reads the initial pattern# from FIFO_STATUS3/4. It then reads the entire FIFO in one read to improve efficiency over reading pattern# then 2 bytes FIFO in a loop. I make sure I only read the FIFO in a size that is a multiple of 12bytes (6 for gyro and 6 for accel) so full samples are read.Often after a few seconds, there is missing data in the block from the FIFO. An example follows:                     GYRO    &

Hi,I'm using the IIS3DWB accelerometer to get triaxial waveform.I just want to know what is the best approach to detect over range.I tried to compare sample by sample in each channel with the maximum possible positive value (>32766) and the maximum negative value (<-32767) but I didn't get overflow detection when the peak acceleration > range.When I set the limits to +/-16384 (half) my detection routine works (with an instantaneous acceleration value > range/2).What is the measured acceleration value when the acceleration is over the full-scale range?Does the accelerometer limit the the value to the maximum?Best regards 

Could you please provide information about the output data rate (ODR) for the IIS2DLPCTR accelerometer?For example, if I want an ODR of 50Hz in High Performance mode, with BW=ODR/2, how accurate is the 50Hz ODR?  Similarly, if I use the single data conversion on-demand mode at 50Hz, what would the accuracy be (assuming a perfect 50Hz trigger on INT2)? Thanks.

Hi team,i'm using STEVAL-MKBOXPRO and want to reprogram its BlueNRG-LP chip.ST provides the original.bin files in STSW-MKBOXPRO-FS.Two .bin files provided in this SW are, SensorTile.boxPRO.bin for the MCU and dtm.bin for the BlueNRG-LP.My question is simple: where can i found the c/c++ code (projects) of these 2 bin files ?So as to change some configurations ...I'll appreciate some help from STM team.Regards, Christian

we are using LSM6DSV16x sensor with nrf5340 dk board , wea are getting values like this ACC[mg]:x:-157.50,y:-30.74,z:981.00GYRO[mdps]:x:-700.00,y:-140.00,z:420.00,please help in calbration to get accurate values of  sensor .

Hi, I understand IKS01A2 is not supported anymore in the current AlgoBuilder software versionIs it still possible to download the last AlgoBuilder version that supports this board ?I can only download the latest version from the website (no older versions).Thanks

Hii, I am using the LSM6DSM imu sensor module . To integrate the driver i followed the link:-https://github.com/STMicroelectronics/st-mems-android-linux-drivers-iiomy device tree modifications looks like this: &i2c3 {     clock-frequency = <400000>;     pinctrl-names = "default", "gpio";     pinctrl-0 = <&pinctrl_i2c3>;     //pinctrl-1 = <&pinctrl_i2c3_gpio>;     sda-gpios = <&gpio5 19 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;     scl-gpios = <&gpio5 18 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;     status = "okay";       #address-cells = <0x1>;     #size-cells = <0x0>;       lsm6dsm-imu@6a {         compatible = "st,lsm6dsm";        &nb

I am using IIS3DWB for machine condition monitoring product development project.I am using the below integration for velocity conversion as per MotionSP but unable to estimate speed RMS (not even 50% closer to the reference values).----------------------MotionSP_TD_SpeedEvalFromCircBuff - perform a speed estimation using a numerical integration method (Trapezoidal Rule) on the acceleration values Formula used:           /* vi = vi-1 +[(1-GAMMA)*DELTA_T]*ai-1 + (GAMMA*DELTA_T)*ai (in mm/s) */---------------------What's best and accurate way to calculate speed from acceleration considering industrial application?ST's timely support would be much appreciated.

I've been trying to interface the STM32F407VET6 with the NRF24L01 modules, however after trying multiple boards modules and library's it still fails to work. im not sure the issue is with hardware as ive tried multiple modules and the black board has a slot designed for this type of module, moving the spi1 pins to SCK(PB3), MISO(PB4), MOSI(PB5) and CE(PB6) CS(PB7) IRQ(PB8), according to the schematics. Trying over the regular pins makes no difference either.  The two main library's i tried were found on github. i tried following the controllerstech tutorial for writing the library and tried the one on github but neither worked using. for the controllerstech lib i tried transmitting to a dummy address which kept returning 0..https://github.com/controllerstech/NRF24L01.git the baud rate for the spi is 2mbps and all configs were kept the same  int main(void) { HAL_Init(); SystemClock_Config(); MX_GPIO_Init(); MX_SPI1_Init(); MX_USART1_UART_Init(); /* U

Hi, I am curretly using a Nucleo H503RB and the IKS02A1 expansion board in order to use the ISM330DHCX.I tried several way to use via STM32Cube IDE which is my goal as i want to use C language without success to see any sign of an i2c adress with an i2c scan code. When i used the Arduino ide with STM32Duino and the ISM330DHCX library it worked immediatly with the wire library i2c default instance. What am i doing wrong in stm32cube ide ? int main(void){  HAL_Init(); /* USER CODE BEGIN Init */ /* USER CODE END Init */ /* Configure the system clock */SystemClock_Config(); /* USER CODE BEGIN SysInit */ /* USER CODE END SysInit */ /* Initialize all configured peripherals */MX_GPIO_Init();MX_ICACHE_Init();MX_USART2_UART_Init();MX_I2C2_Init();MX_USART3_UART_Init();MX_I2C1_Init();/* USER CODE BEGIN 2 */HAL_UART_Transmit(&huart3, StartMSG, sizeof(StartMSG), 10000); uint8_t i = 0, ret;for(i=1; i<128; i++){ret = HAL_I2C_IsDe

Hi,I am trying to use the BLE (SPBTLE-1S chip) on my STEVAL-STWINKT1 board. The idea was to use a project example from X-Cube-BLE2 with the following configuration :HCI_TL : BasicHCI_TL_Interface : UserBoardApplication : SampleAppI used the SPI2 to communicate with SPBTLE-1S.However, I can't communicate with the BLE, the void MX_BlueNRG_MS_Init(void) fails. The function tBleStatus aci_hal_read_config_data(uint8_t offset, uint16_t data_len, uint8_t *data_len_out_p, uint8_t *data) returns BLE_STATUS_TIMEOUT.Maybe an issue with the clock or/and the spi configurations? Or something else?I would really appreciate your help.Thanks.

I am thinking of powering the IIS2DLPCTR accelerometer VDD rail from a buck converter and wanted to understand if this part uses an internal LDO to step the VDD voltage down to power the internal MEMS block and ADC? Or does it use the supplied VDD directly for this? Trying to decide if it’s necessary to use an external LDO on the VDD rail or if a buck with its ripple voltage will not impact performance. 

When I connnect sensorTile.box from App.the followign msg poped ip continuously. and no fucntion work properlywhat is the reason. I upgraded the FW on FOTA  at the first connection.what is the suggestion ?Thanks!Forest