MEMS (sensors)

Posted on December 05, 2014 at 21:12I only seem to be able to power the LIS3DSH down to about 70uA by writing a 0x00 to CTRL_REG4 (0x20). CS is High. SEL is Low. I am using I2C. Running at 2.5V What do I need to do to get to the spec power down current? #lis3dsh-power-down-current

Posted on January 19, 2015 at 10:35how can i manage the self test in LIS3DSH.after enabling this option what i do? where can i found the result of  test?

Posted on June 13, 2014 at 10:07after power up the LIS2DM the current consumption is about 100uA ?!The connection is:Pin1 : SCL with a external 4K7 to 3VPin2 : SDA with a external 4K7 to 3VPin3 : SA0 connected to GNDPin4 : /CS connected to 3VPin5: INT2 openPin6: INT1 to Input Port uPPin7,8: 3VPin9-14: GNDCould it be that there is an internal pull-up on Pin3 and I should connect the SA0 line to 3V to get a low power consumption ? #lis2dm-i2c-sa0

Posted on February 15, 2014 at 11:59Hi, I am looking for SPI driver interface for magnetometer LSM303D thanks #lsm303d-spi-driver

Posted on March 17, 2015 at 13:38Does ST have any mems engineers?.... specifically an expert on the LSM303??? I'm having hardware issues with this part...(it is connected properly, board layout 100%, spi interface working.....not a hobby/hack deal...this is in a real product)....no love from local reps...no love from ST.....is it time to move to AD parts?.....

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Posted on December 23, 2014 at 16:39I have installed UNICO v4.0 to acquire data from the STEVAL-MKI154V1 accelerometer/gyro. However, it seems I am unable to establish a connection with the evaluation kit. The STMicro Virtual COM Port appears in the device manager. When I connect to the port, the blue LED on the STEVAL-MK109V2 turns on. I launch the UNICO software and select the appropriate device. When I go into the various tabs nothing happens when I try to read registers or observe data. I tried selecting 'Easy Configuration', but this does nothing. I try to get out of 'Power Down Mode', but it wont let me get out of this mode.Any suggestions? Thank you.

Posted on March 10, 2015 at 10:18It took me a while to understand it, but the datasheet for the LIS3DSH chip is dead wrong. It's a pretty obvious copy/paste mistake while creating that datasheet from another chip, but there is no such thing on that chip as a multibyte flag on the SPI protocol.Let me say that again: the pages 25 to 28 of document http://www.st.com/web/en/resource/technical/document/datasheet/DM00040962.pdf describe the bit ''MS'', which, in fact, doesn't exist. Also note that every piece of code that is provided within STMCube or SPL is wrong when dealing with that chip.On page 35, table 29, there is a description of the bit ADD_INC from Control Register 6, which does just that: automatically increments the address value when reading sequentially. So it'd be redundant and contradictory with any bit from the SPI protocol itself.It took me a while to figure that one out because I was

Posted on March 09, 2015 at 19:36I was able to get the 6d movement detection working and below I have the register configurations that I've done.My application logic is to configure for normal fifo mode and after a certain application delay switch to configuring for 6d movement detection,on movement configure it back to fifo mode.On reconfiguring the accel to 6d movement, when full-scale is set to +/-2g and the THS set to 4, I see false wake-ups everytime when the accelerometer is configured for wake-up,because of this an accel generates an interrupt as soon as it is configured for 6d movement even when the accel is resting on a table.(Although I understand the THS is low, I'm pretty sure there is no movement big enough to cause wake-up).However, this cycle goes on for about an hour and then the configuration from fifo mode to 6d movement detection works fine.REG1 0x20

Posted on March 06, 2015 at 10:29Hello,Does anybody knows what is the start up time of LSM9DS0 chip? I am having a problem  that chip is sending the same data from accelerometer or gyroscope all the time and I have to reset the device and it is working again. Is there any time that I should wait before asking for measurements from chip? #lsm9ds0-start-up

Posted on March 04, 2015 at 10:15The subject said it all. This is my first day of trying to download the SDK and I'm surprised I could not find any direct link to it. Any kind hearted fellow, kindly help me post the direct link to download them from. Again, is it possible to use Android Studio for development and just integrate the SDK into it? #sdk #smt32l #spirit1

Posted on November 07, 2013 at 17:35Could you please give a overview how to initialize the chip. I miss a description of the diverse adjustments. There are obvious errors in the Data-Sheet of LIS331DL. I.e. HP_FILTER_RESET <-> HP_RESET_FILTER      Where is the ''The H3LIS331DL features a data-ready signal (RDY)'' regards, Steffen #h3lis331dl-configuration #accelerometer #h3lis331dl #h3lis331dl

Posted on March 04, 2015 at 13:19We need to determine the pitch, roll and heading of a handheld device.We are looking to obtain the best accuracy realistically possible.Which part would you suggest and what accuracy could we expect after calibration?The size and power consumption of the sensor are not critical,Thanks.

Posted on September 30, 2014 at 21:25I have been assembling and testing small breakout boards with castellated pin connects using the LSM9DS0 sensor and they all return the proper WHO_AM_I register contents for both the accel/mag and the gyro. And when I jumper connect them to a microcontroller, I get expected readings from the accel and gyro. However, occasionally, the mag reports strange results; either very low values that jump around erratically or the data read correctly on the first loop then is pegged at 2000 mGauss. I am hoping this might be due to the fact that the jumper connections are poor and there might not be enough current flow to satisfy the magnetometer draw in some cases. Has anybody noticed erratic or malfunctioning magnetometer behavior while the rest of the sensor responses are fine? I don't want to have to solder the boards just to test them but I am afraid that just ensuring the I2C works might no

Posted on November 16, 2014 at 23:55I am unable to detect an interial interrupt from the LIS3DH accelerometer as a result of moving the sensor on a flat surface. The sensor is interfaced with an Arduino Uno using I2C. I am using the example in section 6.3.1 of AN3308, LIS3DH application notes. I can successfully read acceleration values. I also tried checking both interrupt ports, int 1 and int 2.Please see attached Arduino code below.&sharpinclude <Wire.h>const int LIS3DH_ADDR = 0x18;int pin = 13;int int1Pin = 2;int int2Pin = 3;/* I2C Communication Set-up ---------------------------------------------------------*/unsigned int readRegister(byte reg) {  Wire.beginTransmission(LIS3DH_ADDR);  Wire.write(reg);  Wire.endTransmission();    Wire.requestFrom(LIS3DH_ADDR, 1);

Posted on October 09, 2014 at 20:52I am using the LIS3DSH. Does anyone have any experience using both state machines at once? Both of the State Machines can be used when run by themselves, but when both operate at the same time, after a few interrupts the accelerometer ends up in an unknown state, where neither state machine will operate (even if all the registers remain the same and both machines are on.) Are there some settings or another way to set up the machines when using both at the same time? Thanks

Posted on March 02, 2015 at 08:27When I measure range of a transparent object like glass or acrylic, with a near background, the sensor measure the background instead of the object.Is there some setting I can use to handle this? may be something to do with the crosstalk setting?Sincerely,Heri #vl6180x

Posted on February 28, 2015 at 12:34Hi I need more information about temperature drift of gyro LISY300AL. If there is a diagram about output behavior vs temperature changes, I would be glad to have it. I cannot find any information about if the gyro can tolerate vibration and acceleration. If it can, what are the limit values? Why cannot i find anything about this part in www.st.com? thanks #mems #lisy300al #gyro

Posted on February 26, 2015 at 20:17Hi,I'm working on a personal project based on the STA321MP + MKI129Vx in order to record audio stream from an array of mics.Our first prototype was built on TI DSP but couple of months ago we decided to switch to ST for flexibility and quality.My engineer is a master on TI but he has never worked on ST components.My questions are:- where can I find the library for the STA321MP?- do you know hw sw engineers, experts on ST DSPs and MEMS Mics, that can be part of this project?If interested, please send me an email to michaelspibbe@gmail.com and I will provide more informations about the project.Thanks so much for your attention.Have a great day.Regards #mems-microphone #sta321mp

Posted on February 26, 2015 at 20:17Hi,I'm working on a personal project based on the STA321MP + MKI129Vx in order to record audio stream from an array of mics.Our first prototype was built on TI DSP but couple of months ago we decided to switch to ST for flexibility and quality.My engineer is a master on TI but he has never worked on ST components.My questions are:- where can I find the library for the STA321MP?- do you know hw sw engineers, experts on ST DSPs and MEMS Mics, that can be part of this project?If interested, please send me an email to michaelspibbe@gmail.com and I will provide more informations about the project.Thanks so much for your attention.Have a great day.Regards #sta321mp #mems-microphone

Posted on June 10, 2014 at 18:20I am using a VL6180 as a proximity detector.  I am able to communicate the part without any issue, but when I read the RESULT__RANGE_VAL register or RESULT__RANGE_RAW I only read 0xFF with no target and 0x00 with a target in any position.  I measured the current from the device and I can see that it is performing ranging at the rate I requested because I can see a spike in current draw that is proportional in length to the distance from my target, but the value in the result register does not change.  Other registers do show a change with target distance, but not the two result registers, so I�m sure I�m not setting something up right.The only register altered from default is SYSRANGE__INTERMEASUREMENT_PERIOD, which I have at 10 for 100ms, and I do see a range measurement every 100ms. #proximity-sesor #vl6180

Posted on February 13, 2015 at 12:54Hi, I am developing an application using the LSM303D connected via SPI to continuously log the acceleration. I want to use the embedded FIFO to minimise the processor load but cannot find the correct configuration. The datasheet is not very clear about FIFO operation, e.g. the maximum FIFO depth is not stated. I have set up the LSM303D as follows: CTRL0 = 0x60; CTRL1 = 0x3F; CTRL2 = 0xD8; CTRL3 = 0x80; CTRL4 = 0x01; CTRL5 = 0x03; CTRL6 = 0x20; CTRL7 = 0x02; FIFO_CTRL = 0x29; During initialisation I stop acceleration and magnetometer functions, set up the device as above and then restart only acceleration sampling. What I see is that while all measurements are stopped, the STATUS_A is 0x08, i.e. a new X,Y,Z data set is available, no matter how fast I readback the acceleration values. Then, after I re-enable the accelerometer,

Posted on January 22, 2015 at 19:04Good morning,Our company is developing a vending machine that includes your sensor LIS3DH controled by one STM32 microcontroller. But until now we haven't get it to receive even the first acknolege response from the LIS3DH. The communications are made by I2C, and the module is connected following the instruccions of datasheet.We have checked the signal of the I2C with the oscilloscope and it seems right, despite there is no response from the device.You can find attached The schema of the connections and a simplified version of the code. (in this case we are just asking a response of the testing answer WHO_AM_I)Could anyone help us? What are we doing wrong?Thanks in advance

Posted on February 24, 2015 at 13:08Hello,Is it possible to generate interrupts on relative acceleration variation, on LIS3DH?For example, I have my board on the desk and I'd like to generate an interrupt when I bump the desk. That should generate a short time acceleration pulse. #interrupt #lis3dh