MEMS (sensors)

Posted on July 20, 2014 at 11:01H3LIS331DL accelerometer has 3-wire SPI mode. What i will get in this (3-wire) mode at pin number 7 (SDO in 4-wire mode). Is it pull down, pull up or open drain ?

Posted on July 19, 2014 at 15:18Transferring my life to a new machine and can't find the mini-CD that came with this eval kit.Does anyone know if it's available online and where?Thanks,Geoff #accelerometer

Posted on June 29, 2014 at 17:20Morning, everyone,I used a demonstration board STEVAL-MKI062V2. I wrote a small C++ program and want to get data from the sensor. It looks like, that some functions are not in the dll file (''iNEMO2_SDK.dll'') .The codes are:typedef int (WINAPI *DLLPROC_CON)(LPCSTR); DLLPROC_CON INEMO2_SDK_ConnectFunction; INEMO2_SDK_ConnectFunction=(DLLPROC_CON)GetProcAddress(hinstDLL,''INEMO2_SDK_Connect'');By debugging I found, the function pointer INEMO2_SDK_ConnectFunction did not get a value. Can someone help me? Does the function INEMO2_SDK_Connect have another name? I read the text ''Wrapper in Visual Studio for the STEVAL-MKI062V1'' and wrote such codes.Best regards06.29.2014

Posted on July 16, 2014 at 11:59Dear all,I'd like to configure the LIS3DH in order to enter my uc in sleep mode in a certain position P0 and then be awaken when the position move from P0 +/- threshold.I dont want to detect a movement but a position change (because it can be slow)I tried different modes (AOI, 6D, Filter modes, REFERENCE...) but without success.Any help would be appreciated.Thanks #lis3dh-lis2dh

Posted on March 25, 2014 at 22:50The data sheet makes no explicit mention of a way to force this interrupt to latch and clear when the CLICK_SRC register is read (like the INT1_CFG registers can).App note AN3308 states that this behavior can be achieved by setting the LIR bit in the TAP_CFG register.  However, this bit is not documented in the data sheet.  Another, similar part perhaps? I'm seeing the interrupt hold for the duration of the CLICK_LATENCY period as expected but would like to clear this sooner as I'm using the data ready signal on the same line.  Is there anything I can do to accomplish this?  I'm sampling at a fairly low data rate (10hz) so shortening the latency period is not an option.  I am using an OEM board that does not have INT2 hooked up. #li3dh-click

Posted on June 18, 2014 at 11:54Hi guys,I have jsut started using the Inemo_m1 discovery board.After Installing the software and doing some hello world projects (using KEIL IDE;debugged via ST-Link debugger), I decided to setup communication with the on board accelerometer.In the installation directory: STEVAL-MKI121V1\Discovery-M1_Fw_Package\iNemo_M1_Applications\Source\examplesThere is a source file named: LSM303DLHC_AccDataReady.cI created a project, set the code in this .c file as the main function and compiled the project. After including some source and header files, the project compiled succesfully.I loaded the project onto the inemo and started debugging with the ST-Link debugger.. The debugger jams atinstruction ' while(!xAccDataReady);' waiting for the accelerometer data ready interrupt to happen. I have gone through all the code

Posted on February 06, 2014 at 20:01Hello. I have received the eval board, STEVAL-MKI138VI, for use with the MEMS microphone, MP34DT01. I have connected the device to my PC, and have downloaded the AP Workbench software to my PC. While I am able to replay the recorded audio sample on my computer, I am unable to access the PDM file to save it.  It seems that the ''settings'' button on the scope screen is disabled.  Can anyone help with this issue? #mems-microphone #evaluation-boar

Posted on July 09, 2014 at 13:00CTRL_REG2 contain REBOOT bit - ''Reboot memory content''. Which memory this bit reboots?A found only one memory - non-volatile memory trimming values ofsensitivity (So) and Zero-gauss level (TyOff). If I can reboot this (non-volatile) memory is it possible to restore So and TyOff values? #lis3mdl-memory-reboot

Posted on March 21, 2014 at 05:56hi, i got accelerometer values in correct way . but magnetometer values are not coming with accuracy. can any one suggest me. how to solve this issue. Regards srinivas

Posted on July 07, 2014 at 15:40Hi all,I am working with the LSM303C and with the EVALBoard ST8S003VLDISCO. When i want to access the Magnetometer data it is giving me some strange values.The Values of the High-Byte are staying constant always with the same values while the Low-Bytes are jittering a lot - not reacting to an external magnet.I can say that the I2C is working properly, because i am able to read and write registers. The Sensor is also working. I`ve tested it with another system.I tried several configurations that work with an Arduino and M3 Board from NI - but it doesnt work. Do you know what this could be? The Accelerometer works properlyRegards Asche

Posted on July 06, 2014 at 04:12Hello, I know this isn't the place for discussing anything other than the 062V2 but I am having trouble searching through the forums for info on the 121V1. I'm having trouble getting my computer to recognize my eval board (COM3 connection not there) and I think I have read an article or two on the documentation that it came with but while I am looking through that again I would like to see where the forum for the 121V1 is for future reference and questions. Anything at all is greatly appreciated. Thanks :) Charles #inemo #m1 #steval-mki121v1

Posted on July 04, 2014 at 15:22Hello,I got good results reading gyro data but the temperature register is about 13(decimal), the datasheet mentions -1LSB/°C, so what is the offset?Room temp is 24°C, the other sensors located near the LSM are indicating 28°C.Thnak you

Posted on July 03, 2014 at 05:08Hello!I'm using LSM330DLC to accept the accelerometer, I want to know the sampling and conversion time of a data, but this time cannot be found on the datasheet. If someone can help me ?Thanks

Posted on July 03, 2014 at 01:56I am considering using an LSM9DS1 over a LSM9DS0 in a design I am working on. I have read both data sheets thoroughly and think I have a pretty fair understanding of each part. My questions are as follows.1. When is the release data for the LSM9DS1. We will need small quantaties ~50 within the next two months. 2.Section 7.12 of LSM9DS1 data sheet mentions that....ODR_G [2:0] are used to set ODR selection when both the accelerometer and gyroscope are activated. BW_G [1:0] are used to set gyroscope bandwidth selection.in section 3.1  o LSM9DS1 data sheet mentions that....In the LSM9DS1 the accelerometer and gyroscope have two operating modes available: only accelerometer active and gyroscope in power down or both accelerometer and gyroscope sensors active at the same ODR.My question is. Is it th

Posted on July 02, 2014 at 19:46Hello,I will be using this chip in an upcoming low power design. In the active mode of the system I am designing gyro, acc, mag, and temp measurements will be made continuously. In the sleep mode of the system I am designing everything will be off, and the LSM9DS0 will be used to wake the system back up via a motion triggered interrupt.To lower power consumption in the sleep state of my system plan is to power down mag, gyro, and temp. The acc will be left on a the lowest sampling rate and will only have 1 axis enabled. Any estimates on how much energy this will consume? The data sheet has a spec of 350uA with acc and mag enabled, but I would like it to be even lower than that. Will this work?To lower power consumption in the active state of my system I would like to know what should be done. 1st option configure the device to use fifos and measure continuously at a fixed rate.

Posted on June 25, 2014 at 19:39Bought this eval board. Hooked it up to a TI Launchpad... I run the SPI in 4 wire... I can see the SPI buss sending data (o-scope)...timing good, clocks good, setup good... When I READ I see the data coming back BEFORE the 8th clock cycle...???? Almost like something is ''jacked'' inside the device... for a test, I step back and forth from writing to a CNTRL reg and then reading it back... (i.e. send 0x00 to CNTRL0 (reg 0x1F)..then I read it back...I see 0 read back...then I increment the data (write 0x01 to CNTRL0)..read it back...I see the ''1'' come back on the 8th clock...not the sixteenth (on a read: R/W=1, MS=0, A5-A0...dummy data for 8 bits...the data from SDO should come back on those last 8 clk's....correct?) so what am I missing?... I also unhooked the SDO from the TIVA (in case of some prob there)...same deal.... bad part?...

Posted on June 24, 2014 at 09:54Dear, What is the power consumption of VL6180X ? Regards. A. #proximity-sensor #vl6180x

Posted on June 24, 2014 at 09:45Dear, Is there a visible red beam/glow from the demo glass ? Thanks. A #vl6180x #proximity-sensor

Posted on June 24, 2014 at 15:51How is the High Pass filter Cut Off frequency selection made in the LIS2DH sensor and how is the cut off frequency is chosen. Is there any privilege of setting the cut off frequency by the programmer. ?? Kindly help out on this .., #accelerometer #lis2dm-i2c-sa0 #lis2dh

Posted on October 10, 2013 at 08:29I'm designing with LSM9DS0. And my goal is interface a 4-wired SPI with the MEMs device. This is my interface design. I add a 3:1 mux for interface 2 SDO pins into a MISO. I want to know that my approach is suitable for interfacing with a simgle 4-wired SPI. If the other idea exist, please let me know. I can't find any reference design for LSM9DS0. So I can't refer any design. Is there any reference design ST proposed? #4-wired-spi #interface-confliction #lsm9ds0 #interface

Posted on February 24, 2014 at 15:03How to configure LIS2DH in interrupt mode for Data Ready(DRDY1). I am stuck on this one.I have tried both latched and pulsed interrupts.I have configured INT1 pin for Data ready Interrupt.But it is not working. Please share ,if someone has any idea.Thanks in Advance

Posted on June 10, 2014 at 12:58I am using an LSM303D and find the noise level surprisingly high. I have configured it with the following parameters:#define CTRL0 0b00000000 //for normal mode, filters by-passed#define CTRL1 0b00011111 //update after read, and all axes of acceleration enabled at 3.125Hz#define CTRL2 0b11000001 //50Hz anti-alias, +/- 2g, no self-test, (SPI 3-wire)#define CTRL3 0b00000000 //No INT1 actions#define CTRL4 0b00000000 //No activity on INT2.#define CTRL5 0b01100000 //No temperature, high-res magnetic, 25Hz, no INT2 latching#define CTRL6 0b00000000 //+/-2gauss sensitivity.#define CTRL7 0b00000000 //normal acceleration filter, no Temp, magnetic always on, continuous conversion modeI have it at a fixed position and static magnetic field and get the values shown in the attached XLSX file:Could I improve it?

Posted on June 18, 2014 at 14:24Hi guys,I have jsut started using the Inemo_m1 discovery board.After Installing the software and doing some hello world projects (using KEIL IDE;debugged via ST-Link debugger), I decided to setup communication with the on board accelerometer.In the installation directory: STEVAL-MKI121V1\Discovery-M1_Fw_Package\iNemo_M1_Applications\Source\examplesThere is a source file named: LSM303DLHC_AccDataReady.cI created a project, set the code in this .c file as the main function and compiled the project. After including some source and header files, the project compiled succesfully.I loaded the project onto the inemo and started debugging with the ST-Link debugger.. The debugger jams atinstruction ' while(!xAccDataReady);' waiting for the accelerometer data ready interrupt to happen. 

Posted on June 17, 2014 at 17:25The old code I developed for other iNemo units does not work with parts just received.  It gets stuck at boot time.Code was based on suite INEMO-ENG-M1LI3_V5-1. It works ok when in debug via ST-link, but if left fee running get stuck before reaching the main. Could it be an ascillator calibration adjutment after the STM103F process srinking or something else in the SystemInit().Anyone can help??

Posted on June 11, 2014 at 07:32We used LSM330DLC Gyroscopes in electric self-balancing unicycle. There is one problem of LSM330DLC  afterreflow solder. The LSM330DLC has offset to detect the angle from the vertical direction. The offset may be 0-7 degree, but they are still in good working condition.I made 1000 units of  LSM330DLC based controller two times using reflow solder. The ratio is about 15% that has offset problem. Others are good.How to solve this problem?Do you think the LSM330DLC are affected by damp? The caution about LSM330DLC is as follows.1.After sealed bag is opened, devices that subjected to reflow solder musta) mounted within: 168 hours at fa