MEMS and sensors

If I am trying to use INT1 to indicate a "data-ready" event, does that result in a Low to High transition on the INT1 pin? Or a High to Low transition on the INT1 pin?  Does the line stay high indefinitely, until the data is read? What happens when new data overwrites the old data? Does the INT1 line change state, and then back again?   

Hi all,I'm trying to use the LIS3DH to detect if the object is in a non-safe position, i.e. standing on a slope (tilted) or in the upside down position and generates an interrupt if it's one of these. Setup:Y-axis pointing downwards in the stable position (y-axis reads +1G)ZH & XH whenever the threshold exceeds 480 mg for longer than 0.5 secondsODR on 100 HzRange +- 2gLPM enabledI've tried the postition detection function for this, but to my experience this only generates an interrupt when it's mostly in the known axis regardless of the set threshold. Maybe I've misinterpreted the datasheet.For now I've got the tilt interrupt working, but whenever I want to detect upside down it generates an interrupt when it's in the stable position. I know this is due to the inertial interrupt triggering whenever the absolute value of the axis is above the threshold, so gravity triggers this interrupt. I'd rather have the remaining interrupt detect a free-fall so I want all of this in t

How consistent is the LSM6 sampling clock? I didn't see any details regarding clock variation at different temperatures, etc in the manual. However, I may have missed it. 

Hi,I have been working on interfacing a Ds18b20 sensor with STM32wb55 development board using CubeIDE version 1.5.0. I am using the code provided by controller's tech website following their instructions. The link for the code can be found below. https://controllerstech.com/ds18b20-and-stm32/The microsecond delay function did not work with the board. Therefore, I have implemented and checked the below code and is working fine (It was checked with the oscilloscope). According to the datasheet, for the initialization of the sensor, the data pin is pulled low from the high state (for at least 480 us) and released by making it a NOPULL input. Therefore the voltage goes high as the data pin is pulled up by a 4.7k resistor. If the conditions are correct, the sensor would sense the rising pulse and must pull the data pin low for reset within 15-60us. I have tried several methods to evaluate the sensor response but no luck so far. The problem persists in all the approaches I hav

There are two parameters "Speed" and "Acceleration Peak" in time domain (using MotionSP library). What condition (e.g. frequency 10Hz - 1kHz use speed and Above 1kHz use acceleration peak) will be used Speed in time domain and Acc Peak in time domain? Please advise. Thanks!Source: Getting started with the STM32Cube function pack for multisensor nodes with signal processing to enable predictive maintenance - User manual

Hi All,I want to port VL53L4CX bare driver to my M0+ MCU (36KB SRAM) however it cannot fit into RAM (.bss)What's RAM requirement of VL53L4CX bare driver ?(I used VL53L1CX ULD and VL53L4CD ULD driver that's ok) or how to trim down the memory requirement ? BR,Sam

Hi I use a nucleo L432KC for a POC with an ASM330LHH. I use the internal FIFO of the ASM330 to store accelerator and gyroscope datas. I use an SPI to get datas periodically.During developpment, we used the 3.3V of the nucleo to supply the ASM330. We didn't notice this issueNow, we use a lipo battery and a traco DC-DC module to do my 3.3v. With it, I supply directly the STM32 on the nucleo and the ASM330. After a few second, the gyroscope always sent 0 dps on the 3 axes. The accelerators are OK. If we used a 3.3V laboratory power supply, we have the same problem. The only solution to use the gyroscope is to use the LDOs on the nucleo demoboard. Other information, during time that the gyroscope giving data, I "lost" regulary a data  from accelerator( 3 axes sent 0g).Thanks for your help or your tipsGraph for Accelerator (0g problem):Graphs for gyroscope :      

Hello ST Community, I am currently working on a flight computer for a model rocket. It will be used together with a barometric pressure to estimate the altitude. It would be very nice if someone could review my schematic and point out any mistakes.   

 From the user manual "A Guide for Using the Artificial Intelligence Enabler VL53L7CH and VL53L8CH Multizone Time-of-Flight (ToF) Sensors" -- specifically the "Histogram Configuration" section -- it mentions that we can use 'start_bin', 'num_bins', and 'sub_sample' to configure the CNH data. I've implemented this configuration using the Example_12_cnh_data.c file, and it works well.My first question is, how many bins are there in the device's raw histogram bins?My second question is, how can I get all raw histogram bins?     Currently, I find that in 4x4 mode, I can obtain a maximum of 75 bins, and in 8x8 mode, a maximum of 18 bins. Is it possible to access all raw histogram bins by editing the API's source code? In other words, assuming the device's raw histogram bins number is 100, how can I obtain 4x4x100 CNH in 4x4 mode, and how to get 8x8x100 CNH in 8x8 mode?Thanks- Jian

Hello.Today I will test the VL53L8A evaluation version in the outdoor (cloudy) test data, the code is automatically generated by the STM32Cube. I irradiated VL53L8A to the wall, at about 1.75m, with almost no data. At 4m, the serial port directly showed no data. Is there any problem with my use?In the future, I may use 950nm narrowband filter in outdoor test, any suggestions?The picture shows the measured values around 4m.

Hi,I'm trying to download the STSW-IMG043 software package for VL53L7CH and VL53L8CH.https://www.st.com/en/embedded-software/stsw-img043.html# It fails every time that I try to download. All other packages from the imaging software section are available but this STSW-IMG043 one. We need it for  x-Nucleo-53l7a1 development.https://www.st.com/en/embedded-software/imaging-software/products.htmlCould you please let me know how I can download STSW-IMG043?Thanks. 

Is it necessary to enable Free Fall detection in order to detect orientation changes? What role does Free Fall (FF) play in this context? Additionally, is there a way to set a threshold force for detecting orientation changes, such as when the IMU is rotated left or right with a certain force, triggering an interrupt?And also can you share the code of 6d detection for lsm6dso

Hi Problems with a iio interface and using of buffer. Goal use the iio buffer interface for accel x y, z and temperture values.    Include one Channel more for the temperature.     static const struct iio_chan_spec st_accel_12bit_channels_temp[] = {ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 12, 16,ST_ACCEL_DEFAULT_OUT_X_L_ADDR),ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 12, 16,ST_ACCEL_DEFAULT_OUT_Y_L_ADDR),ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 12, 16,ST_ACCEL_DEFAULT_OUT_Z_L_ADDR),ST_SENSORS_LSM_CHANNELS(IIO_TEMP,BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),ST_SENSORS_SCAN_TEMP, 1, IIO_MOD_TEMP_OBJECT, 's', IIO_LE, 12, 16,ST_ACCEL_DEFAULT_TEMP_ADDR),IIO_CHAN_SOFT_TIMESTAMP(4) --------- DTB:

Adjusting the register values below seems to adjust the time at which data is written to the buffer. I understood that the value is similar to Data Sampling frequency.If i set the value to 6, about 1900 data per second will be written to the buffer.I would like to know the exact units of that value.

hello Good Morning,       i'm working on asm330lhh imu sensor, i want to get output in angle from raw value. please give suggetion and if you source code of imu sensor so share here.  

Hi,I am using an esp32 to read out the sensor data of a VL53L3CX. I've tried the example code for the distance sensor and slightly modified it by commenting the if statement out which checks if the distance changed to get continiously data:  #define XSHUT_PIN 6 #define INT_PIN 7 #define SERIAL_BAUD_RATE 115200 #define DEVICE_I2C_ADDR 0x12 VL53LX vl53lx(&Wire, XSHUT_PIN); // Holds latest measured distances (up to 4) #define MAX_OBJECTS 4 uint16_t dist[MAX_OBJECTS]; //---------------------------------------- // intaISR - Interrupt handler //---------------------------------------- portMUX_TYPE syncINTA = portMUX_INITIALIZER_UNLOCKED; // For handling ISR entry/exit bool intaINT = false; // True = Interrupt occured unsigned long intervalTimer; // Timer used for checking for lost interrupts void IRAM_ATTR intaISR() { portENTER_CRITICAL(&syncINTA); intaINT = true; // Signal that MCP INTA occured portEXIT_CRITICAL(&syncINTA); } void setup() { int i; VL53LX_Er

1.Sensor variant: IIS3DWB2.Communication Interface with ESP32 : SPI3. Data Reading is based on the ISR. Maximum sampling rate we are reading up to 6.7khz4.using the INT1_CTRL register for the Interrupt config  Issue Description : Based on the block size(Number of data samples read) we are reading the data from the sensor on SPI interface. For the one data acquisition cycle sometimes we are getting the intermediate Negative value and some times 0 as well.The data we are reading from the data read registers ( Register Name and Address : OUTX_L_XL - 0x28 ,OUTX_H_XL - 0x29, OUTY_L_XL - 0x2A, OUTY_H_XL - 0x2B, OUTZ_L_XL - 0x2C, OUTZ_H_XL - 0x2D).For the Axis the data should be either positive or negative. But sometimes we are getting both values from the above register. As per the logs we can see the Negative value is in the range of (-20000 to -32768). This is unexpected values we are getting from that data acquisition cycle.The same is happenin

Can LPS22HB be used to measure liquid pressure inside a miniature container with NACL solution. The sensor will be mounted at one end of the tube like container (4mm diameter). The pressure inside the liquid will keep changing due to the pressure applied from the other side of the tube. Do you think this sensor can be used in such environment ? The pressure range would be within the specified range if this sensor. Also how do you compare LPS22HB with LPS28DFW ?thanks

Dear All, I am using the LIS2DH12 accelerometer that is incorporated within a Decawave DWM1001-DEV board. I am attempting to write a C program using the dwm.h library functions to display the acceleration values for the X, Y and Z axes via I2C constantly. However, after writing my program, I realised that the program only outputs a constant reading of -32640 for all axes as shown below even when I move the accelerometer.My code mainly uses the dwm_i2c_write() and dwm_i2c_read() functions from the dwm.h library with the descriptions of the functions as shown:The main file and header files for my program are attached below. I would appreciate any help on shedding some light on any errors I have made in my program which might have resulted in my problem.Main function:void app_thread_entry(uint32_t data){uint8_t writeData[2];// Enable X, Y, Z axes and set ODR (data rate) - for example, to 10 HzwriteData[0] = 0x20;writeData[1] = 0x27;dwm_i2c_write(0x19, writeData, 2, false);// Set

Posted on October 23, 2015 at 08:33I am in search of 6 or 9 axis IMU mems sensor for golf swing analyses device. The device would be somewhat like  http://3bayslife.com/zone-1/ Should I go for 6 axis DOF or 9 axis DOF? Low power operation is must. Also the captured data is to be transmitted via bluetooth to smartphone. Suggest me with suitable options for 6 or 9 axis MEMs (which one is better and why?) and also the bluetooth socs that are suitable for this project. #golf-swing-analyses

I am using the STHS34PF80 sensor to detect motion and presence. When I read the raw value of TMOTION and TPRESENCE I get both positive and negative numbers. What does the negative sign indicate here? Thanks

Hi all, I am trying to use the MotionVC library functions to return my vertical speed and calibrated speed, however I have encountered two unknowns: the internal timing or buffer processing of the MotionVC_Update() function and why the calibrated altitude does not update on my personal implementation. I am using the Nucleo-F411RE with the IKS4A1 expansion board and have my accelerometer ODR set to 50Hz. and pressure sensor set to 10Hz (as specified). The function is called once every millisecond (much faster than the data is sampled), the timestamp output parameter is unclear as to what it represents. The data response rate is slow or non-existent for altitude and calibrated altitude/vertical speed alike. If anyone has had any luck doing custom implementations of this library or knows if this function can be tuned to be more responsive that would be greatly appreciated. Thanks in advance. 

Hello all,I am having difficulty using multiple VL53L5CX sensors on the same I2C bus on my Jetson Nano. I am able to get a single one working but not multiple. I am following the procedure in the documentation by pulling the LPn low of the sensor I don't want to change the address of and then changing the address of the other sensor, then pulling the LPn pin high again. When I run  my program it outputs the following:Opened ST TOF Dev = 11Opened ST TOF Dev = 12testSensor detectedSensor InitializedSet Address failed 254.When I run i2cdetect -y -r 1 it shows 2 devices detected at 0x20 and 0x29, but I am not changing the address of the other sensor to 0x20. Here is the relevant section of my code below: // setup GPIO for enable pins int gpio_init = gpioInitialise(); gpioSetMode(7, JET_OUTPUT); gpioSetMode(8, JET_OUTPUT); gpioWrite(7,0); gpioWrite(8,0); gpioWrite(7,1); gpioWrite(8,1); VL53L5CX_Configuration dev; VL53L5CX_Configuration dev2; uint8_t is_alive, status, is_rea

Hi everyone,Based on the drivers from ST GitHub, I developed my own one, but I can't understand why it's not working. I can communicate with the accelerometer and I can read the registers, but I don't know why i am having troubles to read the acceleration data correctly.It would be nice if someone knows if it's because I'm not writing to the correct registers at the start-up, or because I'm not reading correctly the acceleration data, so the status register is not cleaned. Thanks!! I attach below the link to my .zip file of all my projectLaraIMK/LIS3DH_HAL_I2C (github.com)

I am using Nucleo F767ZI with SPI interface to ASM330LHHX sensor. I am using example code from https://github.com/STMicroelectronics/STMems_Standard_C_drivers/blob/master/asm330lhhx_STdC/examples/asm330lhhx_read_data_polling.cAfter a couple of seconds "asm330lhhx_xl_flag_data_ready_get" allways returns 0.After power off and power on I get a couple of readings but then again nothing. What am I doing wrong?/* Initialize all configured peripherals */ MX_GPIO_Init(); MX_USART3_UART_Init(); MX_SPI4_Init(); /* USER CODE BEGIN 2 */   platform_init(); platform_delay(BOOT_TIME);   do{ asm330lhhx_device_id_get(&dev_ctx, &whoamI); HAL_Delay(1); }while(whoamI != ASM330LHHX_ID);   /* Restore default configuration */ asm330lhhx_reset_set(&dev_ctx, PROPERTY_ENABLE); do { asm330lhhx_reset_get(&dev_ctx, &rst); } while (rst);   /* Disable I3C interface */ asm330lhhx_i3c_disable_set(&dev_ctx, ASM330LHHX_I3C_DISABLE); asm330lhhx_i2c_interface