MEMS (sensors)

Posted on November 05, 2013 at 10:01Hi, So time to get right to it, I am using 2 LIS3DH Accelerometers ( Two Different Addresses Assigned to them), they are both using the same I2C lines and the same INT line on my microcontroller. That is the way it was designed and now have to make them both work ( NOT at the same time). The problem that I see now is that when I put one accelerometer in Power Down Mode, and configure the remaining device, after the first interrupt sequence all communications seems to die down. The INT line remains low ( configured for active low ) and thats it dead. What I have noticed is that if I remove the INT1 connection from anyone of the devices and address the other, it works perfectly. Just never when they are completely plugged in. Any particular help on the problem is appreciated.

Posted on October 23, 2013 at 11:48As Interrupt sources, what means the ''X/Y/Z High Event'' or ''... LOW Event'' in the datasheet? Are there defined trigger values for these events, and are they changeable in some registers? #h3lis331dl #accelerometer #application

Posted on October 22, 2013 at 16:32Hi,Where are the land patterns for LIS3DH, LLGA16 (3x3x1.0) 7983231 filed?I have tried searching for all of the above keywords but still come up empty handed, the closest i get is a land pattern by maxim, 90-0396.Thanks #lis3dh #land-pattern #lga16

Posted on November 14, 2013 at 08:34Hi, The accelerometer was generating the interrupt when the value of CTRL REG 3 was  set to 0x80. But AS CHANGED TO 0x84 to check the latch interrupt request there is no more interruppt generation. Can anyone provide help on this

Posted on November 13, 2013 at 18:10Hello, I need to configure a LSM330DLC in a way outlined in the DT0005 document.  Essentially, on data ready interrupts (INT1_A) from the accelerometer feed into the DEN_G pin, telling the gyro to push a conversion onto the gyro FIFO.  In this way, acceleration and gyro data are aligned (I think). In addition, I want to have a FIFO watermark interrupt as well as an interrupt to wake my board up upon movement. I believe I need to setup three interrupts sources: 1) INT1_A to be I1_DRDY1 (or is it I1_DRDY2?)  Which one does what? 2) INT2_A to fire upon a motion detection event.  I believe I see how to do this with INT1_A, but I need it to happen on INT2_A. 3) A FIFO watermark interrupt to fire from the gyro side (INT2_G).  This one I have figured out, but need INT1_A/DEN_G working before I can fully test it.

Posted on November 05, 2013 at 18:21Okay - I've got data flowing from the L3GD20 into the microcontroller using the DRDY/INT2 signal.  As I examine the readings that I am receiving from the sensor chip, though, it appears that I receive ''bogus'' values. The chip is mounted on a development board, so it isn't moving at all.  I would expect to see an unending series of near-zero readings.  Several times each second, I get back large positive or negative values (like -4865), which make no sense to me at all.  I understand that the readings are in twos complement format. I'm confident that my SPI setup is correct, since (1) the chip is being properly identified during startup and (2) my settings match what the datasheet calls for.  I'm also able to see the entire SPI ''conversation'' on my oscilloscope, so I can see that the chip is driving the SDO line in a way that allows the bits to be sampled on t

Posted on November 02, 2013 at 07:04Different LIS2DH chips shows various frequencies even they are all configured at 400Hz. The actual frequency value can range from 390Hz to 400Hz.

Posted on October 23, 2013 at 20:58Is it possible to download a driver for the steval MKI062V2 Inemo board in order to use it with windows 8?

Posted on October 25, 2013 at 02:32I am getting data from the gyro from i2c address 0xd6 but I can't seem to get any response from the accelerometer at i2c address 0x3a.  Can anyone share any i2c code that works with accelerometer on this chip? #accelerometer

Posted on September 07, 2013 at 17:37What are the min/max parameters for the sensitivity for the LIS3DH? #lis3dh #lis3dh #motion-sensor #accelerometer

Posted on October 21, 2013 at 14:34Hello.  I want to process each set of readings from the L3GD20 as they become available.  The DRDY signal seems the most appropriate way to do this.  I've verified with an STMicro engineer that my register settings are correct (simply use the DRDY signal in its normal mode), but I can't see the DRDY signal transitioning from high to low.  It stays high all the time.  I'm using an HP mixed signal 'scope and I'm watching all the other signals (SPI/chip selects, etc) with no problem.  I can get DRDY to transition to low when I turn the FIFO on and configure the DRDY signal to indicate when the FIFO fills beyond the watermark (which I set to 1), but DRDY is supposed to work without the FIFO. Has anybody seen this behavior?

Posted on October 22, 2013 at 01:52Hi, I purchased the evaluation kit STEVAL-MKI073V1 and downloaded the driver and GUI tool on its product page. The software recognizes the board as Device LSM303DLH, firmware M303DLH 0.5, Software version 1.0.16. Nevertheless, there is an error ''Not Supported Board, Please, Contact STM for SW Update''.  How can I contact STM for this software update?

Posted on September 23, 2013 at 11:47We are using LIS3LV02DL MEMS inertial sensor.I have painful trouble that its output data suddenly?changes at Low temperature?around -10 Centigrade?.We can't compensate?its output data at that point.How do we compensate  output data in this case? #output-data-suddenly?change #lis3lv02dl #lis3lv02dl-output-data-suddenly

Posted on October 03, 2013 at 01:43HelloAt the LIS3DH Datasheet is stated that there are internal Pull-Ups at all SPI pins of the LIS3DH. How much is the approximate value of the pull-up resistors? According to my experience, with the CS tied high, the SDO pin does really have a pull-up capacitor, but not SPC. Is the datasheet correct? I noticed that at the new LIS2DH, the pull-up is present just at the SDO.Regads

Posted on October 15, 2013 at 01:40There is a L3G4IS http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00044913.pdf that has an OIS (image stabilization) mode that gives an ODR of 9.5KHz - I couldn't find any details on what this is? or how this ODR is achieved? - can you point me to an app note or explanation of this mode? Cheers Calum #l3g4is-odr

Posted on October 04, 2013 at 11:52Hi, I have a 109V2 and the 10-axis module 124V1. I want to customize the FW for logging, but there is a problem at the step 4: 1. Use Dfuse Demo to download the DFU patch and eMotion FW without any problems, all look good, I can use Unico to see/log all necessary data. DFU_Patcher_V1.0.2.dfu eMotionV2_REL_3_0.dfu 2. Compile the eMotion source code (eMotionV2_REL_3_0) by the IAR for ARM 6.60 (using the 30 days evaluation version). All are okay. The file eMotion.hex is generated inside the folder EMOTION_FLASH. 3. Convert the .hex file to .dfu by DFU file manager V3.0.1. No problem. 4. Use Dfuse Demo to download the .dfu file to the MIK109V2. The process is failed at the final state. The error message is: ''Target 00: Verify successful, but data not matching...'' Can you advise how to resolve this problem? Thanks, Taddy.

Posted on October 10, 2013 at 21:48Anyone with experience on SD/MMC interface used in High Speed mode (48MHZ) for SPEAr320S? Seems like the timing could be an issue for some cases.  

Posted on September 27, 2013 at 08:59I'm preparing a new design with LSM9DS0. I want to use the SPI interface, but the datasheet does not solve my curiosity. (The datasheet which I refered is DM00087365.pdf - August 2013, DocID024763 Rev 2) According to the document, Table 2. Pin description demonstrates the pin assignment. However, I can't find the SDI pin in the datasheet. Does the 24 pin have the role of SDA or SDI? Please, let me know about this problem. #sdi #lsm9ds0 #lsm9ds0 #lsm9ds0 #sdi

Posted on October 04, 2013 at 08:12Hello, I am working with LIS302DL Accelerometer. How can i get the real time acceleration? Is it possible to calculate distance using 3 axis data of accelerometer? -Amreen #lis302dl

Posted on September 07, 2013 at 18:21What is sensor fusion? #motion-sensor #inemo #sensor-fusion #sensor-fusion #inemo

Posted on September 19, 2013 at 12:11Are there any plans to produce higher rate gyro's - we are looking for 6000 deg/sec. Low power, digital if possible, triple axis.What volumes would we need to commit to in order to warrant a product like this being launched?

Posted on September 18, 2013 at 11:53You have the category http://www.st.com/web/en/catalog/sense_power/FM89, and there the column MEMS and Sensors.Can I use every Sensor there for automotive applications or do you have a separate marking for that?I saw one or two of the Sensors have the AEC-certificate, with that I can be sure to use them, but they also got 3-5 times the price of those other Sensors in your ''automotive''-category and I need all my sensors for automotive not only two of five.In my case, I look for an e-compass, gyroscope, accelerometer, tempretaure sensor and pressure sensor (barometric)best regardsMarkusR #lifetime #mems #automotive

Posted on September 17, 2013 at 15:53Hello!I have a question about the LSM303DLHC. In the data sheet i can't found any information about the output format for the acceleration and magnetic data. Therefore i thought it works with 16-bit values. While using the sensor I noticed that the acceleration data I get are wrong. After some search in the web and some test I recognized that the acceleration data are 12-bit left-justified and the magnetic data are 12-bit right-justified. The information I found on: http://www.pololu.com/catalog/product/2124Now I hope anyone can confirm my experience?!Greetings Oliver Lubritz #accelerometer #lsm303dlhc-data-format #data

Posted on September 11, 2013 at 16:41Hello,How will gyroscope work if it isn't on rotation axis, but shifted about 1.5 cm off it? Will it still be usable to measure rotation angle? Or such case won't work and gyroscopes output data will be false? #gyroscopes

Posted on August 09, 2013 at 21:29Is there a toolchain and perhaps GUI to dev and debug from a MAC? #inemo