MEMS (sensors)

Posted on June 11, 2014 at 19:10Does ST have an expect product longevity for the MEMS Microphones?  These products look to be targeted at Consumer Products and there would be a concern of using these in an industrial product that needs a life expectancy of 5 to 15 years??

Posted on June 12, 2014 at 18:00Does anyone know where to find/have the actual source code that calculates Roll/Pitch/Yaw for the iNEMO M1 System?I have the MKI121V1. Looking to see if it's possible to reset those values for calibration purposes, or if I'll need to put in offsets in the accelerometer/gyroscope/magnetometer data to get the R/P/Y to display ''0'' at the beginning of data acquisition #roll/pitch/yaw #inemo-mki121v1

Posted on June 09, 2014 at 21:04Is the extended Kalman Filtering that's talked about in the iNEMO Engine LI3 (Lite) something that's already applied in the regular iNEMO suite when calculating Roll/Pitch/Yaw and Quaternion data? If I'm using the software development kit to access the iNEMO M1 using C++, do I need to use the EKF and AHRS source files to get more reliable RPY/Quat data? Or is that already accounted for? #inemo-m1

Posted on June 07, 2014 at 09:58what is the IDE for iNemo development, and where can I download it?

Posted on May 26, 2014 at 09:22How many sensors does the VL6180X contain ? #vl6180x #vl6180x-outline-drawing #sensor

Posted on June 06, 2014 at 01:57Have anybody seen the working example of one? I've got one but can prove it is not designed to be working. Have 2 guesses: it never made one despite promise or I got the wrong file. Any comment welcome. At the moment I suffer of the forwarding this promise to a customer and not getting it work. No further communication was from the device owner. Want to hear even some idea how to approach commonly known way of counting steps based on the crossing the averaged data. Can discuss my approaches. #lis3dsh

Posted on June 05, 2014 at 12:24I try to read both temperature and accelerometer data from LIS3DH. I get accelerometer data but the temperature value is stuck.I have set both  ADC_PD and TEMP_EN in the TEMP_CFG_REG.I would like to have some example code that I can follow.

Posted on June 03, 2014 at 00:50Is it possible to mount two of these sensors about 10 cm apart facing each other, without interference?  And when an object is inserted between the sensors be able to measure the thickness of that object by subtracting the difference?One last question is there example code of how to perform a measurement reading?Thanks! Jerry T. #vl6180x

Posted on June 03, 2014 at 12:54Is there any mean time between failure (MTBF) data available for the LPY430AL? Thanks

Posted on May 24, 2014 at 09:21Hello There,i'm trying to configure the LIS2DH for the free-fall detection. On the Free-Fall LIS should trigger an interrupt on INT1. My configuration looks like that:CTRL_REG1 = 0b00100111;CTRL_REG2 = 0b00000001;CTRL_REG3 = 0b01000000; CTRL_REG4 = 0b10001000;CTRL_REG5 = 0b00000000;CTRL_REG6 = 0b00000000;INT1_CFG = 0b10010101;INT1_SRC = 0b00000000; // Read Only?!INT1_TSH = 0b00011000;INT1_DUR = 0b00110010;it doesn't seem to work propperly ...can anyone help me? #lis2dh #free-fall

Posted on March 04, 2014 at 01:07I am using the LSM9DS0 as a 9DOF IMU for a motion sensing application.  I need the temperature sensor to compensate for temperature-induced gyro drift.  I can get everything to work, but the temperature always reads 0x00 on both the high and low byte.  I set the TEMP_EN bit high and read both high and low OUT_TEMP_XM registers.  I have everything enabled and the mag/acc/gyro all update properly.  I have tried many combinations of settings and still read 0x0000 for temperature.  I have also tried multiple physical parts, so that's not the problem.  Anyone know if there's a known issue with the temperature sensor?  Thanks. Here's the code for my control register settings: LDD_TError set_XM_control_regs() {     LDD_TError I2C_Error;          I2C_Error = Hand_SelectSlaveDevice(MAGNETOMETER_

Posted on May 29, 2014 at 15:15The original post was too long to process during our migration. Please click on the attachment to read the original post.

Posted on May 29, 2014 at 12:33Hi guys/gals,I am new to the iNemo board and to ARM programming in general.I have just bought the iNemo-M1 discovery board, the STM32 programmer by ST, downloaded the firmware and installed the drivers. I have also installed Keil as my IDE.Now I would like to start with just a very simple project which is basically to switch on and off the leds on the discovery board.Can you kindly outline the header files and possible settings I have to do in order to setup a project for such a simple function. I have tried a couple of times but I am still getting a lot of 'undefined' errors.Thanks for your time.regards

Posted on May 28, 2014 at 15:01ST parts with an I2C interface use a restart in a multibyte read transfer.  Instead of a restart, does the more conventional stop, start sequence work with the I2C interface in ST parts? Image is attached.

Posted on May 28, 2014 at 02:57Hi:   I want to enable motion interrupt for accelerometer, but In LSM9DS0 datasheet, there's no description about Duration and Threshold register, Could you give me the example about how to set these two register to enable motion interrupt?   Thanks    Dong 

Posted on May 26, 2014 at 09:13What is the FlightSense trademark, associated to VL6180X ? #vl6180x #flightsense

Posted on February 27, 2014 at 16:52Hi,My raw readings from the accelerometer of the LSM9DS0 MEMS have a big offset in  two axis, it's about 0.15 G in the x-axis and .07 G in the z-axis. i find these offsets about 15% and 7% in these axis are a bit strange, especially when is said that the sensor come calibrated from factory. Could you confirm me if is a normal situation?Regards Miguel Rasteiro

Posted on October 30, 2013 at 12:48Dear all,I am working on the LIS3DH and trying to correctly develop the embedded Self Test feature.All I do is evaluating the difference between the ''Normal Measurements'' and the ''Self Test Measurements'' and check if these differences match with the Self Test Output Change declared at page 10 in the Data Sheet.The problem is that (@3V supply) I always get values about one half the ones indicated in the data sheet. I also found this Self Test Procedure on the web:http://www.edn.com/design/analog/4390843/2/The-embedded-self-test-feature-in-MEMS-inertial-sensorsand it underlines that the measured difference should fall between a range of values but I cannot find on

Posted on May 19, 2014 at 09:17I try use LIS331EB in IAR 7.1 in one big project. Where can  I find  all additional files for IAR (startup_lis331eb.s, StdPeriph_Driver, StdPeriph_Examples )? Should I use core_cm0.h or You can give me something like lis331eb.h ? Will STM produce 8-bit version (more cheap) mcu+sensor? Thanks, Andrei. #accelerometer-lis331eb

Posted on May 16, 2014 at 13:36Hello, I have some problems to understand the table 21(page31 in datasheet). The output rate is clear, but what does the bandwith means? Witch unit have the cut-off term and how did it have influence to my output values? Next the table 26(page 33), did these table describe the lowest output values in dps witch I can get? How can I assign the cut-off frequenz to my output values (-3dB border or)? Sorry for my bad skills in English language! Best regards Thomas

Posted on May 13, 2014 at 20:25The original post was too long to process during our migration. Please click on the attachment to read the original post.

Posted on May 12, 2014 at 11:48When I place this product on a  product to measure acceleration, how does this communicate the data back to a NI system or computer? Do I need to buy corresponding component to initialize the system and gather data back? #lis3dh

Posted on September 23, 2013 at 13:20I am using a PIC32MX795F512H which has a number of peripherals (EEPROM, ADC, DDS, and POT) to which I communicate with via SPI. All these work. However the Accelerometer does not. As one reason could be the PIC setup, I've tried bit-bashing. With the scope my CS, Clock and data output match the diagrams. The LIS3DH will not reply. I've moved the chip lines to use the eeprom lines and still no joy. I've bought an evaluation board and that does not work. There is probably a fundamental problem in my understanding of how the LIS3DH works, either the commands, (0x8f should read WHO_I_AM?) or some aspect of how it handles SPI. I would be grateful if anyone could post either: a) working bit-bashing code (preferably in C or pseudo-code) that I can use to debug/prove my code. b) PIC32MX795F512H SPI set-up and code

Posted on May 04, 2014 at 15:27What document have package marking information for ST sensors?

Posted on May 01, 2014 at 11:01Hello,I've tried to calculate my gyro noise using AVAR (Allan Variance).The results I get are similar to the spec., but the dimensions are dps^2/Hz on my analysis and dps/Hz^0.5 on the spec.  If I calculate the square root of my results (Allan deviation) they are much higher than allowed.Have I missed something?Sincerely,Eran Horesh