MEMS (sensors)

Hi, I hope you can help me with this one. My problem is on line 127 I'm making an array of structs. i would like to make them global, but if I move line 127 to line 74 (Where my courser is) I get stuck in the while(state) on line 94. Why can't I make is global? I've been stuck in while before. if i change the size of the array in line 127 to "10" I'll also get stuck in "while(state)"Does someone know if I have to call a specific function before powering down (to make me not get stuck in "while(state), or anyone who knows why i get stuck in "while(state)" when i change the code? Best regards

Hi,I'm using the LSM6DSL AWT to get interrupts in Y-axis when the angle goes above or below the thresholds. The problem is when happens one change of directions the LSM6DSL gives a false positive interrupt. The sensor detects the horizontal movement as tilt.Exist any way to filter the false positive?Best regards.

Hi, I have a problem with an audio application on the STM32WB55 board. I would like to receive data from a digital microphone over the SAI inferface. I setup the Clock for this interface to 3.09MHz. After that I receive Data over the interface by polling the sensor. For the conversion to a PCM signal I use the PDM library and the PDM_Filter() function. My output signal from this funktion isn´t correct. I don´t know, if my receiving function is correct, too. I append some photos of the PDM signal and the PCM signal. I am new in microcontroller programming. I would be glad if anyone has some advice for me. Thanks Robin

We are using LIS3MDL in our product to detect cars. Most of the times the magnetic field values are stable. We are using adaptive baselining to derive the baseline field. However we have observed that on an ad hoc basis the magnetic field values suddenly varies significantly even when there is no external influence. As a result of this we get a false positive that a car is present. What could be the reason?

Hello,​I am using the BSP resources (stm32746g_discovery_audio) in order to get input audio from the MEMS digital microphones. The ingoing audio quality is good but it sounds like the signal itself is pitch-raised. Voices speaking sound like chipmunks. I have gathered that the audio input from SAI is dependent on dividing the clock frequency correctly, but I'm having a hard time finding resources for how to calculate the divisions. With ADC, the calculations are simpler with the sampling frequency relating to system clock frequency divided by periodlength.How should I calculcate the clock division for SAI? My system clock frequency is 216MHz and target sampling frequency is 44.1kHz.Thank you,

I looked into the user manual, but don't really know how to calculate that. I'd really appreciate it if someone could give me some clue on that

i use the lis2dh12 accelerometer and lis3mdl magnetometer for making tilt compensated compass. i read datasheet and application but i have below list of confusionq 1] which type of data of accelerometer is used for calulate roll and pitch either raw data or converted G data? q 1.1] which equation is used to convert raw accelerometer data to G value ? with example value. q 2] which data i need to put inside accelerometer  3 x 3 misalignment matrix ? this question is related to accelerometer calibration. q 2.1] is it raw data or converted g data?q 3] explain misalignment matrix (between magnetic field and sensor frame axes) of magnetometer ? this question is related to magnetometer calibration.?q 4] once the program is done is the tilt and direction with degree is that affected by different place like india to america?

When leaving pins 2 and 3 of the LSM6DSM unconnected, the device's consumption can increase over time and eventually reach 400 uA. Why is that? could you provide a block diagram of the device?

LSM6DSM pull up configuration for pins 2 and 3 is not working in Mode 1. Does it require something else, besides setting the flag PULL_UP_EN in 1?

Hello,I'm having problems with free fall interrupt. I set every register that needed to be set with values that are written in application note of sensor.57h to CTRL_REG100h to CTRL_REG240h to CTRL_REG300h to CTRL_REG408h to CTRL_REG516h to INT1_THS03h to INT1_DURATION95h to INT1_CFGRead INT1_SRC after interrupt happens.I'm using NUCLEO F091RC where i'm detecting external interrupts on INT1 pin. I think it happened once that interrupt was triggered but that's it or maybe pull-down resistors weren't set at that time. I really don't have any idea what's wrong. DRDY signal on INT1 doesnt work either and was set like FF interrupt from application note.I would really appriciate help from you.

Hi, Could anyone to explain the meaning of "3200" number in Table 10. Operating modes - low-noise setting disabled (LIS2DW12 Datasheet).Is it Bandwidth in Hz?What is practical meaning of it if max ODR is resricted to 200 Hz only?BR, Oleg

I am extracting LSM6DSL's data at FIFO rate 833 Hz and I set the SPI rate at 10MHz which is the max rate that the IMU can tolerant，I thought it should be fast enough for 833 Hz FIFO rate? See the picture below (( plz Ignore the title in the picture its not correct , but the data got mess up after 7th set of data) , the number in the middle shows how many data is left in the fifo)Does any one have the similar issues ? or know how to fix it? Thanks

Our application requires extraction of angle from the gyro samples over short periods of time- a few seconds. In other words, we need to integrate the gyros. We see that when we integrate the data when the device is static the accumulated error is fine- a few degrees per minute. Needless to say we remove the gyro bias error from the readings.However, we ran the following experiment: we set the device on a table with the 'y' axis oriented towards gravity. We then rotate the device about the 'z' axis, back and forth around 90 degrees each time, going back in the end to the original orientation. The whole test took 15 seconds. Each back and forth rotation cycle took around 2 or 3 seconds.The expected result is, obviously, that the 'z' angle (resulting from integration of the 'z' gyro) should change between 0 and 90 degrees. The 'x' and 'y' angles should remain near zero, since there is no rotation there.In the actual results we see that the 'z' angle ar

Hey guys,I am working on communicating to an ISM330DLC sensor using I2C and a TI processor as the master. We only have the accelerometer enabled (no gyro) and are using the FIFO to read the data. When the FIFO gets four pieces of data (2 x, 2 y, and 2 z) we receive an interrupt and then read all of the data out of it. This seems to be working, but every now and then the accelerometer stops responding. The issue seems to be completely random and can happen any time, including in the middle of a read. I have seen it happen after only about 10 seconds of collecting data or after about a minute of taking data. The state of the I2C bus seems to vary as well after the error.I've attached a picture of an example of this happening below. In the picture we were trying to read the FIFO status bits and the FIFO data in one read. It looks like we properly read the status bits and the first half of the data, but then the I2C lines get stuck low in the middle of the re

Hi, Not sure if this is the right place to ask this but not finding any better options after looking around your website a bit. I have an IoT Hub/Gateway application that provides the ability to build out a lot of typical IoT functionality without requiring any programming. It does this by integrating an object based rule engine into the Hub application and then providing an external configuration utility to build your application ruleset. So basically many typical IoT edge applications can be built very quickly, and again with no programming required.   At any rate, another feature is that it comes with a pre-supported suite of sensors, so users just select their sensor from a dropdown in the configuration utility and then all of the accessible BLE characteristics are exposed for them to use in building their rulesets. You can get an idea from a couple of video's linked below or visiting the main

I am trying to upload apps to the tile, but for some of the entry level example apps (e.g. vibration monitor app) and for an expert mode app that I designed I get an error when trying to upload the app. It says: "SD file needed for the app not found" and I cannot upload. I cannot find this in any documentation, please advise?Some of the other entry leve example apps are however possible to upload (e.g. "Human activity recognition").

A daisy chain seems to be complicated because i can not configure the SPI chain in 4 wired at power up.Or, I would like to connect a specific CS on each LPS22HB and connect SCL / SDI / SDO together on the same SPI bus of the MCU. But I do not understand how to initialize the bus for each sensor, because the CS set the bus type SPI or I2C at power up and bock the communication

I use a STEVAL-IDB008V2 and connect sensor LPS22HB to it. By I2C bus , my program communicate with the sensor and it receve interrupt for end of pressure acquisition. The problem is that the pressure read is always equal to 0.0.

ST.box is on track with the most recent software solutions also in the field of Over-the-Air programming: firmware can be updated in a secure way on the ST.box. But let's see in which way.The BLEFOTA firmware can be updated Over-The-Air (FOTA) through an Android/iOS device via Bluetooth using the STBLESensor application: in more detail, the app sends the update and associated cyclic redundancy check (CRC) value, which the BLEFOTA checks against the hardware cyclic redundancy check calculation unit on the STM32L4 processor to ensure integrity. If the CRC calculation matches the STBLESensor CRC value, the new firmware is written at the beginning of the third Flash region. A “magic number�? signals to the STBLESensor that a firmware update has been received and checked, and is ready to replace the current BLEFOTA firmware.The BootLoader checks whether the "magic number" is present and, if the case, the BootLoader replaces the content of Region 2 (previous BL

I configured the device and I am able to read XYZ data by polling the status register 0x27 and reading data when it is ready. I read more than 32 samples of each. Then I tried to turn on the FIFO and setup Interrupt 1 for the I1_Overrun. I wasn't getting interrupts so I decided to take a step back and just try the FIFO and poll the FIFO SRC register to get that working first. I am enabling the FIFO in control register 5 before I set the FIFO mode in the FIFO control register. Then I read the OVRN_FIFO bit but is never set. so I checked the FIFO Control register and read 0x00 after setting it to 0x40. I am referring to App Note 3308 startup sequence in section 4 but the FIFO registers aren't listed there to know when to set those. The FIFO mode section of the LIS2DE12 data sheet just says how to turn on the FIFO but not in what order relative to the other registers.Here are my steps to read data that works:Read register 0x0F - 0x33 Write Control reg

When I am trying to login to Unicleo GUI I am able connect to the communication port but the firmware description, version, expansion board name and library version in the login screen is showing unknown as I result , i suppose, am not being able to connect expansion board( I am using stm nucleo F401RE and the Nucleo –IKS01A2 expansion board).In the user messages it is showing that the successive port is being opened but I am not been able to get any communication with the expansion board as such .(I have already downloaded the virtual port driver as well and I have copied the firmware file from en.excube MEMS1 to user file as well)Please find the attached screenshot from the Unicleo screen as well.

Can you please tell the industrial grade vibration sensors?

Hello, When I am trying to login to Unicleo GUI I am able connect to the communication port but the firmware description, version, expansion board name and library version in the login screen is showing unknown and I am not being able to connect expansion board( I am using stm nucleo F401RE and the Nucleo –IKS01A2 expansion board).In the user messages it is showing that the successive port is being opened but I am not been able to get any communication with the expansion board as such .Kindly note that I have already downloaded the virtual port driver as well.Can anyone please help me figure out the Unicleo with IKS01A2 expansion board working ?

Hi everyone,is possible to determinate which module is mounted between LSM6DSO or LSM6DSOX reading some registers?Thanks and Best Regards,Leonardo M.

Background:I want to calculate tilt angle of my resting device (g is the only acceleration present) using the accelerometer(AIS328DQ) outputs. Consider initial accelerometer readiing as Aref and current reading as A. ​I am using  realtive angle θ = arccos(Aref.A) (dot product & ||A|| = ||Aref|| = 1 g)The major considerable errors in the Aref and A are offset error and sensitivity error. Question: I want to ignore the offset error, because it is the same for both the vectors and I am calculating the relative angle. Please ket me know if I am right. I am using the calibration formula/technique mentioned in the AN4508 related sheet (since I couldn`t find related document for AIS328DQ)https://www.st.com/content/ccc/resource/technical/document/application_note/a0/f0/a0/62/3b/69/47/66/DM00119044.pdf/files/DM00119044.pdf/jcr:content/translations/en.DM00119044.pdf