MEMS (sensors)

I am using the STHS34PF80 sensor with the TMOS10-12030 lens from Fresnel Factory. Does anyone have the transmittance % for wavelengths 5um-20um?Thanks

Hello there, I am currently working on a project where I am prototyping STM32WL55 with an STHS34PF80 sensor to detect the presence. The presence detection is excellent and robust so far. However, the power consumption seems to be very high at the moment. I am using Nordic Power Profiler Kit II to measure the power consumption of the STHS34PF80 sensor and it's around 350 microAmps. I am using Power Profiler as source mode sending 3.3v and measuring current consumption on the sensor. The TMOS Sensitivity is set at 2, AverageTAmbientNumber is at T_1, Block update is false, and TmosODR is running at 4Hz. I am using the Arduino framework to run the overall system and the sensor is purchased from Sparkfun (https://www.sparkfun.com/products/22494).   The power consumption is very high considering the sensor runs 24/7 and interrupts STM32WL55. I am using the library from SparkFun (https://github.com/sparkfun/SparkFun_STHS34PF80_Arduino_Library). Any help would be highly apprecia

I'm working on the IIS2DH and I came to plot the system response at various frequencies depending on the high-pass settings (12, 50 or 100 Hz) with ODR = 5372 Hz, FS = +-4G, input signal 2.82g sin wave (2g RMS). Surprisingly it seems that in the passband not all filters have the expected 0 dB gain, the higher the cutoff frequency the lower the inband gain, as seen below:Is something that is expected for this sensor + digital filtering? What type of digital filter is implemented? I found no traces on this in the datasheet.All informations much appreciated.Thanks in advance

Hello ST Community,I'm currently working with the STHS34PF80 sensor for presence detection on an STM32WB55 development board. However, I've encountered a couple of issues that I hope someone here can help with:Short Detection Range: The detection range without any lens is quite limited, averaging around 1 meter. This is significantly shorter than what I expected for my application. I’m wondering if others have experienced similar range limitations and if there are any suggestions or adjustments that can improve this.Stuck Presence Flag in Register: After a presence is detected, the presence register value maintains a fixed high value even after the object has left the sensor’s detection zone. This causes the presence flag in the function status register to remain raised and not get cleared automatically. As a result, I am unable to reliably use the presence detection for further processing because the presence flag doesn’t reset as expected.Has anyone encountered similar issues with th

Hello ST guys:We have used LSM6DSV FSM function and LSM6DSV supports 4 external sensors. We have seen that SINMUX command is used to change the input source for FSM as follows:But which one of four external sensors will be chosen to use for FSM? How to implement this function for FSM and could you give us any good suggestions? Thank you very much.BRs.

I am not able to pair Sensor Tile.Box Pro with my iphone 13 over Bluetooth with the app ST BLE Sensor. When connecting I get prompted to enter number shown on the device, but the Tile.Box does not have a display, so that’s impossible. 

Hello,     I am developing on a custom boards with a STM32F407, LSM6dsv16x and LIS2MDL.On CubeMX I set the MotionFX package. Even selecting the MotionAC it looks like the library is not added to the output (is it correct?). The motionTL can be added. If I would increase the inclinometer by performing a factory 6-points calibration of the accelerometer, is the MotionTL the solution?On a previous board we used LSM303ARG we measured the 6 points, performed the Matrix calculation off-line.  Does the library compute the transform Matrix? Thank you.

Hello,I'm working on a BLE server using the STEVAL-STWINKT1 board and the STSW-STWINKT01 package , and I'm encountering issues with the GATT characteristic write operations, particularly for controlling an LED.Setup:Board: STEVAL-STWINKT1BLE stack: Using the ST BlueNRG BLE librariesGATT DB: The GATT database includes a characteristic to control an LED (LedCharHandle).Functionality: I'm trying to control the LED on the server side using write requests from a BLE client.Problem:The BLE client sends a write request to the server (STEVAL-STWINKT1) to toggle the LED. However, the write request either isn't received or isn't processed correctly by the server.I've verified that the Write_Request_CB function is implemented and checks the correct handle (LedCharHandle + 1). It attempts to read the data to control the LED, but the LED control functionality isn't triggered as expected.Key Code Sections:Here is the key section of the write request handler:void Write_Request_CB(uint16_t handle

Hi,    I am using ASM330LHB in my project. ASM330LHB has only built self test which can only executed during power on to see ASM330LHB is healthy or faulty? But during runtime (device working in dynamic conditions) there is no way to find ASM330LHB is healthy or faulty?1. Please suggest a method to find ASM330LHB is healthy or faulty during runtime?2. Is ASM330LHB is fully calibrated against over its temperature range?Thanks in advance,Pavani.  

When STHS34PF80 detects the human body for a period of time, TPRESENCE cannot fall back normally, and pres_flag is always 1。 code：

I'm using LSM6DSV, and use it wake-up funciton, I will configure registers when wakeup, that time I got some invalid data such as "1.998665088 1.998665088 1.998665088", how to avoid it?

From theory, we define a Finite State Machine (FSM) as an abstract machine that can be in exactly one of a finite number of states at any given time, and is composed of a START state, a STOP state and a series of states, conditions and transitions. But how is this definition practically implemented in LSM6DSO sensor?For the LSM6DSO sensor, FSM is intended to detect a specific gesture: there are up to 16 independent state machines, both XL and G (and external MAG sensor) data can be used, and a number of interrupts and source registers for the event detection management are available.The activity recognition spans from Free Fall, to Glance, to Flip up and down, passing through Pickup, Shake and Wrist Tilt.If you are interested in a detailed explanation of the LSM6DSO FSM structure, that enables you to develop your own machine, please follow the next posts!Link: https://www.st.com/content/ccc/resource/technical/document/application_note/group0/56/95/d6/a1/34/4c/49/6d/DM005

Hi,I want to compensate for the temperature of the LPS22DF sensor.how does one go about programming for it? Is this formula correct?Pcorrected​=Pmeasured​−(TCF×(Tmeasured​−Treference​))If it is, should I use a temperature reference value of 25°C?Also, can you tell me the value of the Temperature Compensation Factor? Can I make a correction formula with TCO(Temperature coefficient offset) with a data sheet and program it?If possible, please let me know the formula that I can use TCO Thank you

Hello,    I am working on a custom board based on STM32F407 CPU with the LSM6DSV16XTR accelerometer+gyroscope and LIS2MDLTR magnetometer.The aim is to get board inclination and compass information with the maximum accuracy.The MotionFX library seems to work fine but the data from magnetometer are not correct since it requires calibration. On CubeMX even if I select the MotionMC software package, the MotionMC library is not added to the output.  I supposed this happen because the Magnetometer calibration functions are already available on the MotionFX library. The MX_MEMS_Process() is called from a FreeRTOS task, SensorReadRequest is set to 1 from a timer as done in the application demo. The problem is that MotionFX_MagCal_getParams(&mag_cal_data_out);does not update the mag_cal_data_out variable. All the hi_bias output values are 0, cal_quality always 0. During calibration I move the board with the typical "8" pattern but nothing happen.

Dear forum,We plan to assemble five LPS22DF sensors on the same I3C bus and (off course) to address them individually. According to the datasheet (7.4.1 MIPI I3CSM CCC supported commands) the answer to GETPID can only have two values, depending on SDO state. Beside that answer to GETBCR and GETDCR are fixed. As far as we understand Dynamic Address Assignment of the I3C protocol, there is an issue.We cannot use the I2C static address, because again it can have only two values, depending on SDO state.We cannot use Enter Test Mode (ENTTM) command, because it is not supported by the LPS22DF. (Even if we could, we might have 5 different random values in the Provisioned IDs, but it would not help so much to identify each sensor.)Thank you in advance

hi!I have a problem with the calibration of the IIS2ICLX-Accelerometer. I see there is happening a calibration but because I make a sensor fusion in the next step, I want to have the calibration fixed once its done. In the data-sheet and the forum I couldnt find a solution. Is there a possibility to manually control the background calibration process?Thanks!

I am working on a project using the LPS28DFW pressure sensor to monitor depth in water (~1000mBar / 10m), the sensor has a max operating range of up to 4096 mBar limited by its 24 bit 2s compliment output. As far as I can tell the negative half of the output range is never used unless autozero functionality is used, so I was hoping to use this to offset the pressure by a large value (ideally -4096) to better utilise the output range of the 2s compliment 24 bit output.  I have ran into 2 issues with this; first the REF_P (L and H) registers are read only, so I can't set a fixed offset, second the differential output is only put into the normal output registers and not into the FIFO. Is there any way around this? I see there is also a one time programable offset although ideally we would have control over when to offset for the extra range so the autozero function would be better.

Hello,We want to use LSM6DSV IMU sensor with external 3-axis 18-bit high-precision magnetometer sensor through IMU sensor hub function also with its FIFO function. We refer to following LSM6DSV sensor hub example:https://github.com/STMicroelectronics/STMems_Standard_C_drivers/blob/master/lsm6dsv_STdC/examples/lsm6dsv_sensor_hub.cWe found that we can't get 3-axis 18-bit (3 x 3 = 9 bytes) mag sensor data from above example. It seemed that we can only get 3-axis 16-bit (3 x 2 = 6 bytes) through sensor hub with FIFO function. Because our total sensor data size has 9 bytes more than 6 bytes, we don't know how to use sensor hub to get 9 bytes mag sensor data with LSM6DSV. Could you give us some suggestion to acquire 9 bytes data from sensor hub or workaround method? Thank you very much.Nan

Hi,I'm designing a flight controller pcb using several ST mems sensors, (LSM6DSO, LIS3MDL, LPS22HH) and interfacing them to an STM32H743IIT6 microcontroller over a shared SPI bus. I'm on the second iteration of this board, all sensors worked on the first version except the LIS3MDL, this was consistent across multiple boards, which leads me to believe its either a hardware design or a software issue in how I was trying to communicate with it. The behavior I experience with the LIS3MDL is no response at all when any communication is attempted, this is confirmed by scoping the SPI lines.Below are screenshots from my oscilloscope of an SPI read of register 0x0F. Excuse the poor aliasing on the SCK lines, this was right at the limits of my cheap scope lol. Its not shown here but I also confirmed the CS line goes low before the clock starts and return to high after the read is complete.Yellow: MOSI, Blue: MISOYellow: MOSI, Blue SCKSoftware Version 1I used CubeMX to configure the project, as

Hello ST guys:We want to use LSM6DSV(IMU) with an external magnetometer(LIS2MDL) through Sensor Hub mode to gather data and place acc, gyr and mag readings in the FIFO. We want to make INT2 into an input signal which triggers the sensor hub. And we configure following registers to make START _CONFIG = 1 according to following documentation: sh_cfg_read.slv_add = (LIS2MDL_I2C_ADD & 0xFEU) >> 1; /* 7bit I2C address */ sh_cfg_read.slv_subadd = LIS2MDL_OUTX_L_REG; sh_cfg_read.slv_len = 6; lsm6dsv_sh_slv_cfg_read(&dev_ctx, 0, &sh_cfg_read); lsm6dsv_fifo_sh_batch_slave_set(&dev_ctx, 0, PROPERTY_ENABLE); lsm6dsv_sh_syncro_mode_set(&dev_ctx, LSM6DSV_SH_TRIG_INT2); lsm6dsv_sh_data_rate_set(&dev_ctx, LSM6DSV_SH_120Hz); lsm6dsv_sh_slave_connected_set(&dev_ctx, LSM6DSV_SLV_0_1); lsm6dsv_sh_master_set(&dev_ctx, PROPERTY_ENABLE); We also configure data ready signal on LIS2MDL: lis2mdl_drdy_on_pin_set(&lis2mdl_ctx, PROPERTY_ENABLE);

Hello ST Community,Test EnvironmentHW:STEVAL-MKI227KASTEVAL-MKI109V3 SW:Unico-GUI or MEMS-Studio PhenomenonThe pitch/roll angle generated by LSM6DSV16X SFLP is heavily influenced by longitudinal / lateral acceleration. E.g., if I mount the MEMS board in a car, the pitch angle can varied more than ±15° while the car is accelerating or decelerating. The problem is quite similar with this post: Solved: Re: Seeking Assistance: Overcoming Linear Accelera... - STMicroelectronics Community I tried adjusting the ODR and FS parameters but it didn't help. Disabling the gyro will make the situation even worse (pitch angle varied more than ±30°). AnalysisMy goal is to measure the pitch / roll angle on a moving vehicle. However, the sensor fusion output of LSM6DSV16X SFLP does not seem to be able to support this kind of dynamic inclinometer application. And I do not know whether and how can I adjust SFLP configurations to make the algorithm rely more on the gyro i

I am using a LIS2DE12 to detect when a mechanical shock occurs to my device. The datasheet provides only nominal values for the sample rate and the sensitivity.What is the tolerance on the sample frequency, I am using the ODR nominal rate of 5376 Hz?What is the tolerance on the sensitive, I am using the +/-16 g range, which has a typical sensitivity of 187.5 mg/digit.What is the worst case temperature sensitivity?What is the worst case offset?If worst case values are not available is there some characterization data which could provide some guidance?Thank you.

Hi All, From ST website we unable find on the datasheet or more info on LSM6DSLUSTR this part and what is the current status of this part. Besides that, whether both of the part able replace each other.

Hi All I am running Unicon GUI on Windows 10 and using it to communicate with STHS34PF80 sensor plugged onto STEVAL-MKI109V dev board.I can fully interact with the senor via the GUI app. Meaning reading and writing all registers of interest.I however want see what registers are being written and read by the GUI so I attached my logic analyzer to the I2C pins but unable to read any sensible data. So I am assuming that the motherboard is communicating over SPI. I want to be able to sniff the interaction between the GUI app and the  senor over I2C.So what do I have to do to make the GUI change communication protocol.Ola

Hi, I am currently evaluating the LSM6DSV16X IMU and I have a few questions regarding the sensor fusion functionalities, particularly the gyroscope bias.It is not very clear to me when to enable the gyroscope bias, and how to use the data it provides.Here is my reasoning: at rest, the gyroscope data has a little offset from 0. In order to compensate from that offset, one can average the data received, and subtract that from the gyroscope data.Am I correct in thinking that the gyroscope bias generated by the SFLP block is an estimation of this offset ?I intend to record IMU data of a moving object. When the device is moving, does enabling the gyroscope bias functionality automatically correct the output gyroscope data ? Or should I first enable gyroscope bias at rest, save the value it gives me, and then subtract the offset from gyroscope data ?I believe the latter answer to be correct, could you confirm this please ?I am basing my code off of the provided examples : https://github.com/