MEMS (sensors)

Posted on November 09, 2016 at 20:03Hi,I just got new MKI109V2 motherboard, and installed the driver for DFU and VCP. At the beginning, I can detect VCP on my PC and use DFU DEMO to upgrade firmware. After upgrading firmware DFU_Patcher_V1.0.2.dfu, I cannot detect VCP anymore but still be able to upgrade FW via DFU DEMO and then none of VCP and DFU was able to detected on PC. Now my motherboard D5 LED is always ON.My question is how I can reprogram it with what firmware is supposed to be. I got eMotionV2_REL_4_2.dfu from the package of stsw-mki109w. Thx! #steval-mki109v2

Posted on November 06, 2016 at 07:50Hi I am planning on using LSM303AGR to detect a jerk in my system. And I want LSM303AGR to send an INT1 to the CPU to wake.I am thinking to use the accelerometer to determine this jerk. Magnetometer will be in sleep state.How do Iconfigure the device? The jerk is manual. Could be along any axis. And alsocould be rotational movement. So my estimate is that the jerk will be there for 25ms. It will move the device by about 2mm on any axis, It is not a very sudden movement. You can categorize the jerk to be like rotating a knob on a audio system.Whatparameters do I need to set to detect this jerk.Are thereany arduino code for this device?Thanks #lsm303agr

Posted on November 06, 2016 at 07:43HiI am thinking of using LSM303AGR I2C interface. Are there any Arduino based examples for this product?I could not find any online.Thanks #arduino

Posted on November 06, 2016 at 07:33Hi From the spec I see, LSM303DLHC has magnetic range as 8.1g. And LSM303AGR as 50g.So what does that mean? Which one more sensitive? which one more accurate?Does that mean, unless there is a big delta in magnetism change, LSM303AGR does not detect?Thanks #lsm303agr #lsm303dlhc

Posted on November 03, 2016 at 01:31So as in title I'm having problem in configuring LSM6DS3 to send DRDY on INT1 and INT2 lines. Basically I wan't to have drdy of acc on int1 and drdy of gyro on int2. However after writing to both INT1 and INT2 registers I'm still not getting any sort of interrupts on any of those lines? Could anyone give here an advice maybe I'm misssing something and there is additional stuff to write to registers?? 

Posted on November 01, 2016 at 10:14I'm trying to get an LIS3DH accelerometer working and I have a question about the output data.It seems to be very ''noisy''. I have the board with the accelerometer on a flat table.I've set the data rate to 100hz and 2g fullscale , high res mode on.The data seems to jump all over the place. If I tilt the board fully one direction I get about 16000 countsand fully the other direction I get about -16000 counts, which seems to be about right.Still very noisy around the main reading.when it is flat on the table I get anywhere from +128 to - 128 counts. Counts change in increments of 16.Is this normal behavior? CheersNeddie

Posted on November 01, 2016 at 12:14Hi,I want to use LPS22HB to measure the pressure on some points of a wing profile.Is it possible if I build the right embodiment?Rocco #lps22hb

Posted on October 27, 2016 at 03:57I have modified the platform.h and platform.c to run on Raspberry Pi.  The i2c-tools show I can read the device, and the routine VL53L0X_DataInit() returns no error, so I can write to the device.  But I am getting a timeout error from the VL53L0X_get_info_from_device() routine.  Is there any place where a complete list of internal registers and what they do for the VL53L0X device exist?  The API seems really complicated for just having to flip a few bits on the I2C bus. Thanks! Mike #vl53l0x

Posted on September 26, 2016 at 12:14Hello Forum and ST support,I was wondering if the magnetic sensors of the LSM9DS1 are factory calibrated or not. At the moment, it looks to me as if they're not calibrated at all. My hard and soft iron calculation from measurement leads to extremely different results, despite all sensors are placed on the same PCB and in very similar environments.Could you verify for me if they're calibrated or not? If not, is there a possibility to get factory calibrated sensors, so that I'd have to run my measurements and calibration factors only once per PCB design and not for every single unit?Another question relates to that: Can you provide a tool that calculates the hard iron and soft iron compensation factors from measurements (CSV file)? As by now, I'm using a free tool I found somewhere in the internet, which works fine, but only calculates the hard iron offset. Another tool which is su

Posted on October 27, 2016 at 11:00The original post was too long to process during our migration. Please click on the attachment to read the original post.

Posted on October 27, 2016 at 08:56Hai,I am sathish from Comtustec India Pvt., LTD., Coimbatore, In my design I am using your LIS2DS12.Can you please provide me a footprint and step file of that sensor.

Posted on September 29, 2016 at 21:04When the force sensor is powered off the LSM is always on and the microcontroller is in sleep mode.  Sometimes the battery will drain to empty.  When powered back up the LSM gets hot although it still works.  We usually replace it and all is good.  It connects to the CPU via SPI, SCX/SDX are GND, CS_AUX and INT2 float. The LSM connections look good, no shorts.  I have one now that got hot.  I removed the battery and reinstalled it, power cycled and the LSM did not get hot and hasn't since then.  Is there something we should do, command wise, before entering power down?  Have you seen this before?Thanks,Tom

Posted on October 26, 2016 at 17:36I'm using a  STEVAL-IME002V2 single lead ECG evaluation board. I do not use the ECG DB 15 connector, instead i make use of the RL,LA and RA leads in the board to connect the electrodes. I'm trying to get the heartbeats, as ECG signal waveform is not fully required for my project. currently i'm using only 3 electrodes(RL,LA,RA). Please help me with the settings through  which i can  get the heartbeats in the PC application (Eden application), which is provided with he evaluation board.I need to know the deafult settings of the board from which i can get heartbeats in eden application.

Posted on October 26, 2016 at 17:33I'm using a  STEVAL-IME002V2(HM301D) single lead ECG evaluation board. I do not use the ECG DB 15 connector, instead i make use of the RL,LA and RA leads in the board to connect the electrodes. I'm trying to get the heartbeats, as ECG signal waveform is not fully required for my project. currently i'm using only 3 electrodes(RL,LA,RA). Please help me with the settings through  which i can  get the heartbeats in the PC application (Eden application), which is provided with he evaluation board.I need to know the deafult settings of the board from which i can get heartbeats in eden application #steval-ime002v2

Posted on October 25, 2016 at 17:01We are using the LSM9DS0TR and here is what I am seeing� I have both CS-G and CS_XM tied t0 3.3V and SDDO_G/SAO_G and SDO_XM/SAO_XM tied to GND, this should give me the following I2C addresses (we are using I2C to access it) Linear Accel and Mag Sensor address of 3D/3C, and angular rate sensor address of D5/D4I can read from the angular rate sensor just fine, the transactions look normal and everything works so I know my code works.When I change my code to read from the Linear Accel (which is the feature we really need ) it doesn�t work.What I have found is that the repeated start is not being generated correctly (or at least that�s what it looks like) when reading from the linear accel, yet reading from the angular rate sensor, it looks perfect.  Why would this occur?  Is there some errata that I am missing?

Posted on September 26, 2016 at 14:54Hi Team , We are working on LIS2DH12 chip for accelerometer and temperature readings . Hardware Cicuit details : a. VDD and VDDIO : 1.8 V We are facing issue in the temperature readings. Please find below for the steps for reading the temperature value . Sensor Initialization for Temperature : a. Initialization of the temperature sensor : TEMP_CFG_REG to 11b. CTRL_REG4 BDU bit set to 1Reading the temperature :  a. Reading the OUT_TEMP_L (0Ch), OUT_TEMP_H (0Dh)b. Convert the value of OUT_TEMP_H register content ( which is in 2s complement ) to decimal .b. Temperature Value  =  25C (Reference Temperature )  + ( Converted decimal value from above step .This value m

Posted on October 19, 2016 at 17:30 Hello, I have a problem with the LIS331HH Sensor. The X and Y direction are send correctly to my microcontroller, only the Z value has an offset. I've tried different LIS331HH and the offset is not always the same, so I don't think that I have an error in my code, and when I change the resolution, I have the same offset, e.g. 2 m/s². Here are samples of my code: /* Registers */ volatile static uint8_t ACCEL_ADDRESS = 0x30; volatile static uint8_t CTRL_REG1 = 0x20; volatile static uint8_t CTRL_REG4 = 0x23; //CTRL_REG1 volatile static uint8_t MODE_NORMAL = 0x20; volatile static uint8_t ODR_1000Hz = 0x18; volatile static uint8_t Xen = 0x01; volatile static uint8_t Yen = 0x02; volatile static uint8_t Zen = 0x04; //CTRL_REG4 volatile static uint8_t FS_24G = 0x30; //For Result volatile static uint8_t OUT_X_L = 0x28; /* Variables */ volatile static int16_t X, Y, Z; static uint8_t Accels[6] = { 0, 0, 0, 0, 0, 0

Posted on October 25, 2016 at 12:01Hi,I am trying to find MEMS wireless  accelerometer. It can be an integrated device or a small board. Does ST has one ? Thanks for the help.  #mems #accelerometer #wireless

Posted on October 21, 2016 at 14:30 Hello, Recently I've been tasked with modifying existing code running on a system which contains a LIS2DH accelerometer. It should be pointed out that I'm used to high-level programming languages and this is my first venture into embedded development, so please forgive me if some of my questions are a bit... Dumb. I'm trying to access the FIFO buffer in order to look for a sustained period of low-g measurements. The existing code to find the number of lines in the buffer is: // Finding out the number of rows in the FIFO buffer GPIO_DRV_ClearPinOutput(LIS2DH_CS_PIN); // SPI enable, i.e. I2C disable FIFO_src_reg=acc_read_byte_blocking(LIS2DH_FIFO_SRC_REG); GPIO_DRV_SetPinOutput(LIS2DH_CS_PIN); FIFO_nbr_rows=(FIFO_src_reg&0b00011111); FIFO_nbr_rows+=((FIFO_src_reg&0b01000000)>>6); From what I understand, this means that we're retrieving FFS4 to FFS0 according to 2.3 in

Posted on October 14, 2016 at 09:14Hello, Is there a way to manually reset the LIS3DH? In our application, VCC is coming up *very* slowly, inherent to the system. I have the suspicion that the LIS3DH occasionally does not boot correctly as it fails self-test after boot. Power-cycling it brings it back to normal. Memory reboot (CTRL5:BOOT = 1) does not help. We have a clean reset source which takes care of the reset of the system. Is there another way to control the LIS3DH reset? There is a pin called 'RES' to be tied to GND which could stand for 'RESET' (or 'RESERVED'...). Thanks, Norbert

Posted on October 19, 2016 at 10:31Hello, I have been playing with the IIS2DH configuration and there are couple of settings that are not clear for me, for example: - what is the I1_DRDY2 used for? - similarly I'm not sure about I1_AOI1 vs I1_AOI2 interrupt functionality - in CTRL_REG6, as per spec I2_INT1 and I2_INT2 redirect interrupt functions 1 and 2 respetively onto INT2 pin, but what is the actual difference between function 1 and funtion 2? It would be great if someone could clarify it. Thanks. #iis2dh #drdy1 #drdy2 #aoi2

Posted on October 13, 2016 at 15:47HiI have 2 LPS25HB pressure sensors. I moved them from exact the same level to another level. The readings from both sensors are different. The start points are different and the slope of the value change is also different! However, i just programmed to read the value out without editing any reference or offset, or differential setting. Can i correct the results by editing some registers, if so which registors?Thanks Rui

Posted on October 13, 2016 at 13:40Hi , I'm newbie with stm32f3 and i want to send the accelerometer data to my raspberry pi 2 through USB , please i need some help  ? 

Posted on October 11, 2016 at 21:34The datasheet specifies that it has 16 bit output data, but the data that i get out of the registers are 12 bit ie first 4 bits of High Byte is always 0. Am i doing something wrong here or is the effective resolution only 12 bit ? #lis331 #lis331hh

Posted on October 11, 2016 at 12:21I need connect 3 LSM303AGR in the same I2C bus. Is It possible? How do I change the I2C Address?   #lsm303agr #i2c