MEMS (sensors)

Posted on April 12, 2013 at 11:06Hello,Accorting to datasheet, LIS331HH accelerometer don't have register WHO_AM_I. Is it possible to read identification data from 0xF register? What is identification value of LIS331HH? I need detect this accelerometer, because it has different full-scale value as for example LIS331DLH.this

Posted on April 08, 2013 at 22:36Hi all, I am new to the ST MEMS line, and recently purchased a few of the development boards to start testing (STEVAL MKI109V2, MKI120V1, and MKI115V1).  I followed the manuals for assembly and installing Unico, and have gotten the pressure sensor board to work over USB.  However, when I plug the Bluetooth module in and power up, the D2 LED on the BT module is barely lit and the device does not show up in a windows Bluetooth device scan.  It seems as though there is a fault somewhere in the BT module but I figured I would ask here before trying to RMA. Thanks, Jon #steval-mki115v1

Posted on April 08, 2013 at 14:28Hi, I am trying to read temperature values from OUT_ADC_3_H. I have also enabled BIT 6 and 7 in TempCfgReg and  Block Data Update, BDU  at CTRL_REG4(0x23). CTRL_REG1 is set to 100 Hz with value 0x57 running in normal mode. I always get 0x81 ~ -127 (2's complement) value in OUT_ADC_3_H. I running out of ideas. Any help or pointer would be helpfull. Best regards

Posted on April 01, 2013 at 16:19Hello.I use LIS3DH accelerometer with 4-wire SPI interface.I attached schematic of accelerometer connection (AccelSch.pdf).ACL_VDDIO = 3,3 VACL_VDD = 3,3 VOther ACL signals connect to microcontroller pins.R9A=R9B=R9C=R9D = 100 Ohm.When I configured accelerometer to work in 4-wire mode I saw that accelerometer send data on SDI pin 6. (SPI_Data_Transfer_4wires_Mode_Img1.jpg and SPI_Data_Transfer_4wires_Mode_Img2.jpg).Yellow signal - clock (SCL pin 4).Green signal - SDI pin 6 on net ACL_SDA/SDI/SDIO.When I configured accelerometer to work in 3-wire mode I saw that amplitude of signal on SDI pin 6 increased (SPI_Data_Transfer_3wires_Mode.jpg).Why accelerometer send data in 4-wire mode?

Posted on November 19, 2012 at 16:27Hi, I want to build an altimeter using LPS331AP sensor and after reading AN4159 I discovered that I should have software filter to have an accuracy of 0.02 mB required for altimetery. Do you know where to download such filters?MCU L�fter #lps331ap

Posted on July 31, 2012 at 12:14I can't quite work this out.  Someone tell me if I'm crazy.LSM303DLHC datasheet is somewhat difficult to read here.  I have CRB_REG_M set to 001, +/-1.3gauss, its most sensitive range.  But all its axes are not equally sensitive, the datasheet Table 75:Sensor input field range [Gauss] : +/- 1.3Gain X, Y, and Z[LSB/Gauss] : 1100  (the ''Z'' is surely a typo here, Z is described in the NEXT field)Gain Z[LSB/Gauss]: 980Output Range: 0xF800–0x07FF (-2048–2047)They're saying Z is actually less sensitive and has greater range, which is correct, the Z component of the Earth's magnetic field is actually significantly greater than the vector sum of the XY components.I am fairly certain I have correctly decoded the I2C registers.  X and Y are signed 2's compliment 16 bit ints, divided by 1100.  Z is divided by 980. &nbs

Posted on February 01, 2013 at 08:32I have a MKI-119V1 evaluation board and want to use the iNemo example application for IAR Embedded Workbench provided in..\iNEMO Suite\Firmware\iNEMO_Project\iNEMO_Project\iNEMO_EWARMBut after compiling and downloading with DfuSe Demonstration nothing happens and the usb connection is lost. If I have understood it correctly I should at least see a Led blinking by uncommenting the following line in main.c://#define TEST_ENABLECan anyone give me an explanation how this works: Is the the Dfu always located at address 0x8000000 and the application at 0x8003000?If I download a new application will it automatically be located at 0x8003000? Will the Dfu still be located at 0x8000000? Do I have to change anything in DfuSe?Do I have to build both the Dfu and the application and combine these to get it working?If anyone can give me a detailed explanation of how

Posted on January 05, 2013 at 10:15Hi, We are currently working on gait analysis using inemo V2. For real time processing we need to interface inemo with either matlab or labview. Can anyone please guide us for this interfacing?  #steval-mki062v2 #microcontroller-projects

Posted on December 07, 2012 at 11:55Dear Forum,i try use the maximum aquision frequency of 400Hz (acc, mag and gyro). My application is written in C++ (Visual Studio 2012, Windows 7) and i use the SDK for accessing the device content.Having a buffersize of >= 4 I only reach a datarate of about 270Hz. It looks like the serial interface is not able to handle that much data.Is it possible to increase the serial speed anyhow?Thank you very much!/Daniel(iNemo suite also does not handle the 400Hz)EDIT: My ''having buffersize >= 4'' may be misunderstood. Using a samplebuffer, that is smaller than 4, i reach a smaller frequency (down to 66Hz at buffersize=1). Raising the buffersize raises the frequency up to max. 270Hz .  #serial #baudrate #aquision #sdk

Posted on November 21, 2012 at 23:48Can the i2c output be used for maximum data rate or is SPI necessary to get full bandwidth out of this sensor?What is the meaning of ODR and BW in the data sheet? Thanks,Alex

Posted on November 16, 2012 at 22:22Hi all,is there anybody worked with LIS3DH accelerometer?i am very confused about axis value represeintation.when the scale is 8g, z axis value is 16 but the other axises are 255 in decimal.How can i represent these values as g value.Any data sheet or any suggest?

Posted on November 16, 2012 at 10:15Hi, I would know if it is possible to use the lps001 pressure sensor as altitude sensor? Does anyone tried this?MCU Lüfter

Posted on November 05, 2012 at 11:58I have the STEVAL-MKI062V2. I erased the original flash contents and downloaded my own code.Now I want to put again the old flash content to use with the iNEMO Suite application. I have the iNEMOV2_Firmware_PackageV2.2.0_AHRS.hex file but I don't find the right DFU.hex.The Computer doesn't recognize the USB interface and nothing works.Any ideas?Thx!

Posted on July 05, 2012 at 14:55The original post was too long to process during our migration. Please click on the attachment to read the original post.

Posted on October 24, 2012 at 18:01Good afternoon ...I'm using PIC16F886 with LSM303DLH and am only able to read the records, I am not able to write.For example: I am trying to write to the registry MR_REG_M, 0b0000000. But when I do the reading is appearing 0b00000011.What can it be? #lsm303dlm

Posted on September 13, 2012 at 07:51I am trying to calculate the heading of the 3 axis compass and stuck with this issue that I can't solve. when I read the compass output register viz.0x03 (x_msb),  0x04 (x_lsb),  0x05 (z_msb),  0x06 (z_lsb),  0x07 (y_msb) and  0x08 (y_lsb).  the  x,y and z MSB values are not updated at all where as y and z LSB are updated as expected. I configured the CRA_REG_M (00h) to  0x10 for 30Hz ODR,  MR_REG_M (02h) to 0x00 for continuous mode and CRB_REG_M (01h) to every possible value of (GN2,GN1,GN0) for all sensor rangebut had same result. I can't understand what the problem is, The I2C software seems to be fine as it works perfectly for accelerometer and gyro!!!!.did anyone come across this issue????sample output:Mxh=-16 Mxl=0 Myh=-1 Myl=

Posted on September 25, 2011 at 18:13has anybody tried accessing the iNEMO board from an embedded linux device using the usb interface? I am able to power the iNEMO from my device and also able to load a usb-serial driver. What I don't know is the correct serial interface parameters to use to open the port. I hope that somebody in this forum has already gone through this exercise. thx! #inemo

Posted on August 02, 2012 at 06:13I have the problem with usage STEVAL-MKI062V1 evaluation board. My task is to develop the linux program, which read the information from inemo V1 sensors. I can't find the V1 board communication protocol in the Internet. The board answers nothing in attempts to write down in COM port a connect sequence according to the V2 communication protocol. According to what protocol can I work with a board?

Posted on September 24, 2012 at 07:19hi,i have steval-mki109v2 board with steval-mki108v2 i want out put data from it's uart port , not through usbhow to reprogram dis board?what are changes in firmware ? to do this #steval-mki109v2

Posted on September 14, 2012 at 16:03Dear all, I am using the LIS3DH configured with 1.25 kHz bandwith (ODR) and high resolution (12bits), full scale range of +/- 2g. I have a question regarding the noise I should expect at this frequency : The datasheet gives an Acceleration noise density of 220 ug/sqrt(Hz). I found in a Freescale pdf the following note : '' When this value (noise density) is multiplied by the square root of the measurement bandwidth, this result is the RMS acceleration noise of the sensor at nominal VDD and temperature. Accelerations below this value will not be resolvable.  '' In my case this calculation gives a peak to peak noise of 22 mg (about 5 bits). Is this reasoning correct ? Thanks for your help.

Posted on September 15, 2012 at 15:18I apologize right now for my English. I purchased a STM32VLDISCOVERY and unsteval-mki0 +2 v2 both st microelectronics. I tried the program that is given with the second component, and seemed very nice. Wanted hours interfacing the STEVAL-mki062v2 with the STM32VLDISCOVERY so that, for example, if the sensor has a temeprature of more than 30 degrees turns on an LED, if not remains off. How do I do or where I can find material with explanations? Thanks for your help #c++-programming-st32-tutorial

Posted on August 31, 2012 at 01:40 Hi, in the example code of the LPR430AL there are written these values in the Header. one is from datasheet but where is the other from ? LSB/dps ? Where can i get my LSB value? /*!<300dps Full Scale Pitch axis Sensitivity [ mV/dps ]see LPR430AL datasheet*/ #define Gyro_Sensitivity_P_300dps 3.33 /*!<300dps Full Scale Pitch axis Sensitivity [ LSB/dps ]*/ #define Gyro_SensitivityLSB_P_300dps 4.13 I need the LSB Value to calculate the Densivity for the LPR45AL. Please Help WR Ersan #lpr450al-gyro-lsb-value-stm32

Posted on August 28, 2012 at 12:01I'm trying to use the V2 board as a sensor board for own experiments with sensor fusion using C# (in VS Express 2010) But I already have the problem, that the debugger throws me out of the Wrapper in the Connect-function. It complains about, that the INEMO2_Connect function called from the DLL generates some stack inbalance, indicating, that there is some problem with the arguments. Does anybody else use the SDK with a .NET language?

Posted on August 10, 2012 at 22:01I was reading through the documentation on these and saw the ''block data update'' feature, obviously useful because it's two 8-bit registers and it might be possible for the data to update between reads and thus not read a coherent 16-bit value.I am wondering if there's more specific data on this.  As written, this seems potentially dangerous and could make it worse, potentially making a situation where it guarantees all values will be a glitched combination of LSB and MSB from two samples.The problem is if somehow one sample is ever read without reading the other.  It seems like the master and peripheral would then be forever out of sync.  The master would read the MSB then the LSB, but due to a prior read of the LSB without a successful read to the MSB, the peripheral would see the MSB read and update the MSB/LSB there, then the master follows with a read of LSB and gets

Posted on August 07, 2012 at 14:38I work with the gyroscope LPR430AL. The pitch angle works fine, the roll angle results in some strange values... (if I turn the module of 90° in roll angle I measure the right value of 90°. When I come back to 0° I measure ca. -25° like an offset. I turn again the module to 90° and I measure just 65°, come back to 0° and I measure -50° and so on...)Any idea?Thank you!