MEMS (sensors)

Posted on May 26, 2018 at 15:52My question is about the VL53L0X.In the Datasheet on Page 30, there is a Collector Exclusion and Emiter Exclusion Zone defined. Sadly I did not find any information how big the cone will be at a Distance X. Is this cone expanding with the same angle as shown in the graphic?My conecern is the following. Imagine the VL53L0X Vertically mounted in 1cm high on a endless white surface. At some distance X the cone of the sensor will be so large, that it will detect the white surface. A Object on Distance X+n would then not be recognized.How can if ind out what the maximum circle of detection is at range max of 2000mm?And how does the VL53L0X work? Is there a single, absoulte range value, or is it possible to still detect a change in constellation even if the VL53L0X sees an obstacle? By the change of value from the changed constellation?Thank you

We have a circuit with STM32L433 and we connect it to ST Gyro sensor LSM6DS3.We work with the Gyro in normal mode just fine with i2c interface.on power up, the Gyro is configured as follow: // register address, register value 0x19, 0x38, 0x10, 0x30, 0x11, 0x32, 0x15, 0x10, // High performance disabled 0x16, 0x80, // High performance disabled 0x0D, 0x02 we are trying to have power save mode but the current consumption is high relative to the spec.We are getting more than 350uA for the Gyro only (we have tested the circuit with gyro and without it)I configure the following registers: // register address, register value 0x10, 0x00, 0x11, 0x00, 0x13, 0x44  (with this register or without it.)

Section 4.2.3 of the application note for the LIS3DH sensor provides example register values for various sensor readings. For +/-2g at high resolution mode the typical sensitivity is 1mg/unit. When BLE=0, I see why registers 28h and 29h are E0h and 15h respectively (for a 350mg reading). However, I do not see how a 1g = 1000mg reading is 00h and 40h in those two registers. Would this not be for a sensor reading of 1024mg instead? ​I would think the sensor reading should be 80h and 3Eh to provide correct 1g result.

Hello, I am using an Nucleo - F401RE MCU, with the CCA02M1 module, and the STEVAL-MKI155V1 microphone coupon board and have encountered an issue with acquiring 4 audio channels. Using the Acoustic Source Localisation program provided in the X-cube-MEMSMIC1 package, I can build the project, but when I debug, I encounter an Audio Error in the CCA02M1 driver, when it checks the SPI receive.if(HAL_SPI_Receive_DMA(&hAudioInSPI, (uint8_t *)SPI_InternalBuffer, X_NUCLEO_CCA02M1_Handler.PdmBufferSize) != HAL_OK) { return AUDIO_ERROR; } }Due to this, the only thing I can think the issue may be, is the solder bridge configuration. I followed the user manual configuration attached.

Hi,We are trying to develop a pedometer based on LIS3DSH. We already have aSTM32F4 (F407) discovery board equipped with LIS3DSH. As stated in the document"Application Guidelines for LIS3DSH State Machine", there is anapplication "Pedometer Based on State Machine".If anyone has the code, would you please share.Regards,ierturk

I just purchased a STEVAL-MKI019V3 evaluation board and a STEVAL-MKI183V1 LPS-33HW sensor board. I installed Unico 7.0.0. I received the error message "Error: The device selected is not supported by the motherboard" ... use DfuSe Demonstration software. I installed the DfuSe software, set the board the DFU mode, and click the Choose button. I don't know what file to select or where to find it. Please direct me to the file and confirm that my issues are reasonable considering this hardware is new. It seems odd I would need to reflash a V3 board.ThanksDoug

Posted on April 09, 2018 at 14:30Hey,I'm testing the way BlueCoin is working with FP-AUD-SMARTMIC1 distribution. I used this guide to connect and start working: http://www.st.com/content/ccc/resource/sales_and_marketing/presentation/product_presentation/group0/5b/24/f1/b4/bf/14/4a/19/FP-AUD-SMARTMIC1_Quick_start_guide/files/fp-aud-smartmic1_quick_start_guide.pdf/jcr:content/translations/en.fp-aud-smartmic1_quick_start_guide.pdf The problem is: when I try to start a session with the tool available in this distribution (GUI or CLI), it fails with a ping error, even though the com port i'm using i

Hello;I now test the LPS25HB pressure sensor with abnormal temperature reading. The actual ambient temperature is 30 degrees, but the read-out data TEMP_OUT_H (2CH) = DAH, TEMP_OUT_L = 50H. Slowly changing the ambient temperature, temperature reading also changes, indicating that the temperature sensor is working properly. But according to the register reading instructions, the reading value is negative, so I want to know about the temperature register numerical interpretation.

Posted on March 22, 2018 at 11:52I recently purchased the VL53L1X P-Nucleo kit with extra expansion boards for evaluation of the VL53L1X and suitability of integration into one of our upcoming products. We are exceptionally happy with the performance and capability of the L1X over L0X! In particular the ability to create a distance detection band (our case 300mm to 600mm) which is absolutely fantastic for our product. My questions are as follows:We will be using an Arduino beetle in the product for control of the VL53L1X, when will any Arduino code become available? I'm guessing it's similar to the code for the VL53L0X but with additional code for control of the extra parameters? Apologies but I'm not a software bod or I would have had a crack at it myself!The expansion board kit (VL53L1A1) that comes with 2 breakout boards, has an IR cover window supplied (Oval one) are these available to buy separately? Ideally we would like to be

LSM303AH's datasheet specifies "Magnetic sensor offset" equal to 0 mgauss. This requires offset cancellation to be enabled. How should this value be interpreted? Is this zero offset feasible only in some particular conditions? Then, what offset can be expected otherwise? Or, is this chip really capable of eliminating the offset on its own?

I'm doing research using the LSM6DSL to collect acceleration and angular rate data at 833 Hz from an array of IMUs. We are using the on-board FIFO so we can read back data blocks of data from each IMU. While reading back the acceleration and angular rate date works just fine, I'm having trouble getting the timestamps to read back correctly. The timestamps and pedometer are enabled as the 4th data set, but the datasheet is not clear on how this 4th data set is configured. How many bytes are allocated to each data type, and in what order? Right now, the timestamps are counting up, but in multiples of 250 when I read the timestamps as the 3rd and 4th bytes of the 4th data set. I've tried different byte configurations, but have been unsuccessful thus far.

Hello, we are working on a product, to detect, classify and monitor the activity of a cattle, using a custom built ear tag, that will among other things have a MEMS sensor. I am an expert at embedded development, but dont really have any background on activity tracking.I am looking for some help with deciding the hardware architecture for the application. Is a 6 axis/9axis (Acc / Gyro / Mag) + a STM32 MCU capable of handling this application? or will I need something more like a small DSP for example?Any pointers on how I should approach this will be useful.

We are using the LIS3MDL in conjunction with a microcontroller (STM32F051).In most cases, the sensor responds correctly to our initialization and provides its data with around 1.068 kHz.However we sometimes experience that the sensor freezes for around 63 seconds, meaning after the last data read it takes 63 seconds until the DRDY line goes high again.It happens directly after we (for testing) restart the MCU and re-initialize the sensor.We are connecting the sensor using I2C to the MCU. There is no other device on the I2C bus.We use the sensor in the 1 kHz mode. Whenever the DRDY line goes high, we read the 6 data bytes (Address 0x28-0x2D) using DMA.We configure the sensor as following:CTRL_REG1: 0x02 (Temperature Sensor disabled, Operation Mode = Low Power, Data Output Rate = 0, , Fast Output Data Rate = 1 kHz, Self Test disabled)CTRL_REG2: 0x00 (Fullscale = 4 gauss, Reboot = 0, Soft Reset = 0)CTRL_REG3

The SPI works well. I can asleep the sensor but when I try to asleep the EnOcean module, I see that the sensor consume near 500µA. I have put two pull down on SDI/SDO and SCL and two pull up on the CS_ACC and CS_MAG.

We have an LSM6DSL sensor working in fifo mode. We are running it at 833 Hz but with the measured data, we are getting ~ 819 Hz. I am trying to investigate what the cause is. Can you tell me how accurate the internal clock is? If set properly, shall I expect exact 833 samples/ second? or is it okay to see some drift?

I am using a LSM9DS1, the datasheet doesn't clearly state the settings for HPF cutoff for accelerometer. Moreover, when I enabled HPF using Reg7_XL, I get 0.18g on all the axis, which is noise since my platform is stable. Can somebody help me with this?

Hi,Has anyone successfully used sensortile(soldered on small cradle) with Unicleo GUI ? If yes which firmware should be used to interface sensortile with Unicleo GUI ? In "Release Note for X-CUBE-MEMS1 Software for STM32, Expansion for STM32Cube" support for sensortile is mentioned as follows :Projects X-CUBE-MEMS1 Examples for SensorTile V4.3.0 (release notes) But I could not find this particular firmware in the firmware package(X-CUBE-MEMS1 ) .What am I missing ? Any help on above would be appreciated.Thanks.

In regards to the AIS3624DQ, I have a few questions about the part:Page 31 of the Data Sheet, paragraphs 7.10, 7.11, 7.12, which are the X, Y, and Z axis’s acceleration outputs, the description only says “expressed as two’s complement. Could you please provide some more information regarding this output, and a few examples? If all of the defaults are used for all of the registers, want does the LSbit indicate?  What does "OUT_X_L and OUT_X_H" = x0000_0001 equal? On your web page for the device, there is a link to a "Design Tip" DT0106, on page 2, Figure 1 of that document, could provide the typical outputs for the AIS3624DQ for those 5 pictures, and maybe another one where the sensor is at a 45 degree offset from one of the axis's. Regarding the SPI Read, and specifically FIGURE 8 "Multiple byte SPI read protocol; If I wanted to read register x28 & x29 (OUT_X_L and OUT_X_H), would the correct SDI comman

The datasheet states that the the SIM (SPI Mode Selection) bit in the CTRL_REG3_M of the LSM9DS1 sensor enables only SPI read, if the bit is set, although my measurements with an oscilloscope shows quite the oppposite.Is it possible that the datasheet is incorrect and the functionality is 0: SPI RD+WR; 1: SPI WR?Details: without any initialization and reading the WHO_AM_I_M register I get a response, but if I set the SIM bit in CTRL_REG3_M, the SDI line stays HIGH.My conclusion should be right, because the only change I've made was setting of the SIM bit, and as I've written, my proof was an oscilloscope.

Posted on February 23, 2018 at 11:13Hi everybody, in our application we use the LIS2DS12 sensor and we would like to perform a continuous long term data acquisition at high data rate. In order to achieve it, we use the LIS2DS12 in Continuous mode at 6400 ODR. The used communication is 4 wired SPI at 5 MHz. The FIFO_THS is set to be 128 and INT1_THS is activated. Until this point the chip works perfectly, I got the external interrupt, when there is 128 sample in the FIFO and I can read these X-Y-Z samples from the FIFO correctly and convert them into engineering format (IF_ADD_INC is enabled). During the tests we observed that the data is discontinuous and it missis 7-8 samples between the adjecent 128 X-Y-Z readouts. This 7-8 missing sample is corresponds to the time while I read the FIFO via SPI. The calculation: (1 cmd byte+128samples*6byte)*8bit*1/5MHz = 1.23 msec <=> 1/6400*8 sample = 1.25 msec. It seems us that the chip free

Hi,I have Using SPI Communication for interfacing AFE4300 sensor with STM32f4 board. I have developed AFE4300 library files as per MEMS Sensor. but it's not working. if anyone have any references sensor code or library files please send me? there are no any resources on the internet also. please help me.Thanks,

If so, where can I download load the Windows installer (not interested in source code)? Thanks

Hello.I am building a project using a digital microphone output. I will be giving the output of micrphone i.e. PDM output to two different circuits, Is it possible to drive two circuits from same microphone ?Thanks & Regards,Om Patel

we use LSM6DSL mems part for one our product.I configured mems FIFO to Continuous mode with accel odr set 416hz and FIFO ODR at 415 Hz as well. when we try to read FIFO at speed of 25 msec. fifo data x,y,z will be miss aligned . ie ex: expected x=8, y=-3, z=998. but we get x=998, y=5, z=-3.Please note: Gyro is powerdown, No decimation accel only selected. Device is not movingThis has to Aligned as expected (x, y, z) format. Need help in figuring this

Please let me know below information for Gyro sensor 1) The Sensitivity for X axis, Y axis and Z axis for three devices （mdps/digit） 2) Please let me know sampling frequency for three devices​Device :L3GD20H, I3G4250D, LSM6DS3