MEMS (sensors)

Hello everyone,I'm working on implementing the Kalman Filter algorithm for sensor fusion from the MotionFX library using the ISM330DHCX MEMS sensor. My setup consists of the STM320G71RB board and the IKS02A1 expansion board. I'm trying to get the pitch and roll angles mainly, but the problem is, when the sensor is static, the pitch and roll angles exhibit drifting over time. In addition, when I look at the raw data from the gyro and accelertometer along all three axes, I don't see any drifting, only consistent fluctuations. This is what i'm currently doing using the motion_fx_cm0p.c library:  -MotionFX init-Gyro calibration enabled-6x fusion enabled and 9x fusion disabled- sensor setup at 12.5 Hz data rate for both Acc and Gy, scale set to 2g and 125 dps, slope filter for Acc set to ODR/100, and LPF enabled for Acc.- data acquisition from Acc and Gy in g and dps respectively.- applying the MotionFX_CM0P_update() function to get rotation angles.  I also have tried co

Hallo ST Community, Which Part Marking has H3LIS331DL ? Thanks RegardsBadis

STEVAL-C34KAT1 Vibrometer eval board came today and I see it came with 32 pin expansion flex cable (STEVAlL-FLTCB01).   On one end, I plug it to this eval board.  On the other, what do I plug it to?  None of my ST eval boards have such connection.   I need some kind of (beak out) adapter to connect to pins on  board.  What adapter do I need please to connect this to pins?

Hello Everyone!!!I am using ISM303DAC Mems sensor for my project ie., E-Compass.I have used MotionMC and MotionEC libraries to get the heading value i my compass is getting calibrated by MotionMC and after that i am sending those calibrated values to MotionEC library and receiving heading values but there i have found that Angle is drifting about 0.1 -  0.9 deg. Is it possible to compensate this drift i have taken reading for 15 min in a particular place & observed that there is a standard deviation of around 0.5degCan anyone please suggest how to compensate this drift.Thank you!!!regards,ANIL.

Hello Everyone!I am working on a project Ecompass using controllers STM32F401CBU6 and mems sensor ISM303DAC. can able to read raw values of both accelerometer data and magnetometer data properly and after reading the magnetometer data i am parsing magnetometer data to MotionMC library for calibration purpose but after calling MotionMC_GetCalParams function output is always showing asHI_Bias = {0, 0, 0},SF_Matrix = {{1, 0, 0}, {0, 1, 0}, {0, 0, 1}},CalQuality = MMC_CALQSTATUSUNKNOWNi have used systick as timestamp and and also cross verified with heap and stack, rotating the sensor in 3D space 8 direction everting tried but nothing got work..... got stuck at this point.could anyone please let me know what might be the problem.Thank you!!!ANIL.  

Hello,For a predictive maintenance project on an STwinkT1B board. I am using an iis3dwb vibration sensor.When retrieving the data provided by the sensor, one of the obtained values is saturated close to 65535, which is close to 16 bits.I am using the FIFO_continues mode and registers 0x78 to 0x7E to read the FIFO.To summarize:data_buffer[j] = raw_buffer[i] << 8 | raw_buffer[i+1];with j ranging from 1 to 3 and i ranging from 0 to 7. Please advicesRegardsRapha

Hi, I need some clarification about digital high-pass filter in LSM6DSO since the datasheet and application note for LSM6DSO seem to lack explanation about certain features of it (or I just didn't get it).1. In on page 20 of AN5192 (refer to the image below) showing a table of accelerometer bandwidth selection in mode 1/2/3, it has a list of max overall settling time (samples to be discarded). Does this max overall settling time referring to only the initial period of time when the HP_SLOPE_XL_EN bit is set to 1 and the accelerometer starts producing data or is it referring to the periods from time to time when there are abrupt changes in the accelerometer reading?2. On the same page I mentioned in question 1, it briefly talks about fast settling mode but it doesn't really talk about how fast it shortens the settling time of the low-pass/high-pass filter of LSM6DSO. How fast does the fast-settling mode do the job for either filters? Is there any specific specification about it?3.

Hi,I am using AIS2IH.I  can see in terminal   window of my computerthat registers of  data and temperature are zero's.   0 0 0  ...My program use the setup: ais2ih_cs_mode_set(&dev_ctx, AIS2IH_PULL_UP_DISCONNECT);ais2ih_i2c_interface_set(&dev_ctx, AIS2IH_I2C_DISABLE);ais2ih_spi_mode_set(&dev_ctx, AIS2IH_SPI_4_WIRE);ais2ih_reset_set(&dev_ctx, PROPERTY_ENABLE);platform_delay(0x00333333);ais2ih_reset_get(&dev_ctx, &rst);platform_delay(0x00333333);ais2ih_reset_get(&dev_ctx, &rst);platform_delay(0x00333333);ais2ih_cs_mode_set(&dev_ctx, AIS2IH_PULL_UP_DISCONNECT);ais2ih_i2c_interface_set(&dev_ctx, AIS2IH_I2C_DISABLE);ais2ih_spi_mode_set(&dev_ctx, AIS2IH_SPI_4_WIRE);/* Set full scale */ais2ih_full_scale_set(&dev_ctx, AIS2IH_2g);/* Set Output Data Rate */ais2ih_data_rate_set(&dev_ctx, AIS2IH_XL_ODR_400Hz);ais2ih_filter_path_set(&dev_ctx, AIS2IH_LPF_ON_OUT);ais2ih_filter_bandwidth_set(&dev_ctx, A

Can I use the STHS34PF80 outdoors?This is because ToF sensors cannot be used outdoors.

Further to this earlier post, any chance now is a BMA400 SPI library already ported to STM32CubeIDE?Many thanks

I am using the STM driver to control the LIS2DH12TR accelerometer.The freeRTOS sensor task is as following (checks on return values and variables definitions are removed to simplify the code comprehension): void MEMS_task(void) { lis2dh12_self_test(&dev_ctx); result = lis2dh12_operating_mode_set(&dev_ctx, LIS2DH12_HR_12bit); result = lis2dh12_data_rate_set(&dev_ctx, LIS2DH12_ODR_100Hz); result = lis2dh12_fifo_mode_set(&dev_ctx, LIS2DH12_BYPASS_MODE); result = lis2dh12_block_data_update_set(&dev_ctx, PROPERTY_ENABLE); result = lis2dh12_temperature_meas_set(&dev_ctx, LIS2DH12_TEMP_ENABLE); for (;;) { result = lis2dh12_xl_data_ready_get(&dev_ctx, &acceleration_data_available); if (acceleration_data_available != 0) { /* Read accelerometer data */ memset(data_raw_acceleration, 0x00, sizeof(data_raw_acceleration)); lis2dh12_acceleration_raw_get(&dev_ctx, data_raw_acceleration); acceleration_mg[0] = lis2dh12_from_fs2_hr_to_mg(data_raw_

I have a project where I'm using the BLE whitelist.In order to do that I'm using the aci_gap_set_undirected_connectable API.However, the BLE beacon does not seems to advertised, only the scan response seems to be shown by my phone.When I tried to use the aci_gap_set_discoverable, beacon was shown as expected.Am I missing something?Any help will be appreciated.  The project runs on STM32WB55.I used both ST BLE toolbox and nRF connect applications on my android phone to view the advertise data.The code that does not advertise the beacon:    uint8_t AdvertiseBeacon[] = {ADVERTISE_BEACON};    uint8_t ScanResponse[] = {SCAN_RESPONSE};    hci_le_set_advertising_data(beaconSize, (uint8_t*)&AdvertiseBeacon);    hci_le_set_scan_response_data(sizeof(ScanResponse), ScanResponse);    aci_gap_set_undirected_connectable(advertiseInterval_min,         advertiseInterval_max,        GAP_RESOLVABLE_PR

Hi! I've got a product that we've just made a load of and while building out the firmware I realised that the INT pin on the LIS3MDLTR doesn't (at least according to the datasheet) appear to be able to be configured to show when new data is ready. The DRDY pin seems to be required for that, and it hasn't been connected in our design.Is there any magic way of using INT as a DRDY pin, like a hidden register value that could be changed?Failing that, are INT/DRDY open drain outputs? We have very limited IO on our MCU, but could we short them together in a revised design?thanks,Gordon

Guys, I ran into a strange problem while debugging LIS2DH12, someone help me. I configured the high-precision mode, using 12 bits, with a range of +-4g, that is, when I placed the table (the chip with the sign facing up, the positive direction described in the instructions) it should have been subject to neutral acceleration and the converted value should have been -1g, but the result I got was +1g, I verified the other two axes, The resulting acceleration value is the opposite of the direction indicated in the manual, that is, when I always accelerate in the opposite direction of each axis, the resulting conversion value is indeed positive   Moreover, I read out the register value directly using lis2dh12_from_fs4_hr_to_mg function for conversion, and the size is close to 1g, but its direction is reverse, at this time I am the chip marked up, the acceleration value should be gravity acceleration downward is negative, it is positive.

I use accelerometer LIS2DH12 to wake up the device by motion detection. It's working correctly for long time but currently I found a trouble with interrupt. It's rarely happen and hard to reproduce.Here is my initialization: INT1_CFG = 0010 1010INT1_THS = 0000 0010INT1_DURATION = 0000 00010CTRL_REG2 = 0000 0101CTRL_REG3 = 0100 0000CTRL_REG5 = 0000 1010 (LIR_INT1 = 1)read to clear INT1_SRCI start up my device and wait device go to sleep, then I lightly touch on my device to wake up, The INT1 signal and I read INT1_SRC register before continue proccess. After that, the INT1 still signals again and again eventhough I leave my device stable on the table.I have checked LIR_INT1 at CTRL_REG5 that INT1_SRC cleared by reading INT1_SRC but when INT1 signal, I read INT1_SRC (= 0110 1000 for example) then second read INT1_SRC (still = 0110 1000). To stop INT1, I have to clear INT1_CFG in my code. Note that, The whole process I make sure

Hi, I am trying to configure interrupt on LSM6DSLTR module but I am not able to get any interrupt on the pin INT1.I am using nrf52 dk for setting interrupt on pin. err_code = nrf_drv_mpu_write_single_register(LSM6DSL_ACC_GYRO_INT1_CTRL, 0x03);if(err_code != NRF_SUCCESS) return err_code;err_code = nrf_drv_mpu_write_single_register(LSM6DSL_ACC_GYRO_TAP_CFG1, 0x90);if(err_code != NRF_SUCCESS) return err_code;err_code = nrf_drv_mpu_write_single_register(LSM6DSL_ACC_GYRO_WAKE_UP_DUR, 0x00);if(err_code != NRF_SUCCESS) return err_code;err_code = nrf_drv_mpu_write_single_register(LSM6DSL_ACC_GYRO_WAKE_UP_THS, 0x02);if(err_code != NRF_SUCCESS) return err_code;err_code = nrf_drv_mpu_write_single_register(LSM6DSL_ACC_GYRO_MD1_CFG, 0x20);if(err_code != NRF_SUCCESS) return err_code;After configuring interrupt my values becomes repeated or same<info> app: 251781.25, 231621.25, 231621.25, 1755.82, 1755.82, 1755.82<info> app: 33643.75, 13483.75, 13483.75, 235.09, 235.09, 235.09Ca

I have a question about the FIFO_Pattern.If I have only configured the accelerometer and set the watermark to 1536 samples, meaning 1536/3, which is equivalent to 512 samples (16 bits each sample) for each x, y, and z. And one sample is reading from 8 bit FIFO_DATA_OUT_L & FIFO_DATA_OUT_H.Will I have to skip the first 3 samples for the gyro, or will the samples be only for the accelerometer? For example, if the IF_INT bit in CTRL3_C (12h) is set to 1, and I am reading 6 bytes from register FIFO_DATA_OUT_L, do the first two bytes correspond to Ax, the next two to Ay, and the other two to Az?

HiI saw that the CS and I2C enable are on the same pin and also the SPI and I2C CLK and data.Does it means that this component can not be with other SPI IC on the same line? (because when the CS is 1 while talking to other ICs it will be in I2C mode and will transmit junk to the bus)? if so, its intended use in SPI mode is to be single component on the bus?regarding Lis2MDL it has I2C_DIS (h62 bit 3). this is also not 100% clear to me. If I connect 2 ICs on same bus in the moment I will start to config the first IC to disable I2C the other will interfere because it CS will be on 1... please help me understand how can I do it? maybe the I2C_DIS bit is the default (it is missing in the datasheet)?please help me understand this issue.thanks

Hello,I am looking for sensors for an upcoming research experiment looking at helmet-mounted motion and environmental sensing and found this article: MEMS Accelerometer Integral To New Helmet-Mounted Impact Sensor | Electronic Design. I am not looking to study collision; this will be used in an aerospace environment where I will be looking at acceleration, vibration, and head angle, as well as multiple other environmental factors (temp, pressure, etc.). This led me to the x-nucleo-IKS4A1, which appears to have all (or most) of the capabilities I am looking for, but I am pretty new to all this and would like to understand: 1) if there may be a better product, 2) what would need to be purchased alongside this product, and 3) average time of set up for implementation especially for someone unfamiliar with these systems. Thank you!

Hello, Im trying to set up Act/Inactivity INT1 at high ODR (1.66khz / 2000dps / 4g). Its threshold is too high so it resets or goes in/out of active/inactive state too often. Is there any way to lower the activity threshold so it really needs to be at rest to enter an inactivity state? Regards, 

Hi, I am working on Anomaly Detection in motor using ISM330ISN. As soon as I am choosing the Buffer Size of 256 in the datalogger and adding the signal, I am getting this warning of minimum RAM required is 9KB. However upto 128 buffer size, it is working fine. What is the reason that I am getting warning as I am going above 128 buffer size ? @Denise SANFILIPPO @Eleon BORLINI   

As mentioned in the datasheet of ISM330IS, we can go to accelerometer ODR of 6667 Hz but in the NanoEdge AI Studio, it is showing only upto 833 Hz. Can you tell how can we go above ODR of 833 and the. Also how can we go above Sample per axis i.e. buffer size of 256 ? @Denise SANFILIPPO @Eleon BORLINI    

Hi there, In the app, my steval-mki197v1 with LSM6dsox gets recognized as LAM6DSO32.Is this normal behaviour?luika

My question is, using Algobuilder (or mems studio) and unicleo, can i use for example two accelerometers (on hardware nucleo 401RE, x-nucleo ISK01A3 and steval MKI233) and get data from them simultaneously to reduce the measurement error/noise?Whats the best option for this to be made?Thanks in advance

I'm currently trying to stabilize the MotionFx Sensorfusion in an environment with medium magnetic disturbances. However I don't quite understand the three parameters ATime, MTime and FrTime from the Knobs structure. For example the manual UM2220 describes the values in a range from 0 to 1 but the default value in the startup seems to be 1.5f for the the MTime Parameter.So from UM2220 I deduct that MTime and FrTime should be at a high value near 1 (e.g. 0.95f), but I don't experience a major change setting those parameters accordringly. So what is the correct range for the parameters and how do I set them, if I want my transfer function to be stable against low magnetic disturbances? Thanks in advance! I'm using version 2.7.1 btw.Moritz