MEMS and sensors

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

Posted on June 11, 2014 at 19:10Does ST have an expect product longevity for the MEMS Microphones?  These products look to be targeted at Consumer Products and there would be a concern of using these in an industrial product that needs a life expectancy of 5 to 15 years??

Posted on June 12, 2014 at 18:00Does anyone know where to find/have the actual source code that calculates Roll/Pitch/Yaw for the iNEMO M1 System?I have the MKI121V1. Looking to see if it's possible to reset those values for calibration purposes, or if I'll need to put in offsets in the accelerometer/gyroscope/magnetometer data to get the R/P/Y to display ''0'' at the beginning of data acquisition #roll/pitch/yaw #inemo-mki121v1

Posted on June 09, 2014 at 21:04Is the extended Kalman Filtering that's talked about in the iNEMO Engine LI3 (Lite) something that's already applied in the regular iNEMO suite when calculating Roll/Pitch/Yaw and Quaternion data? If I'm using the software development kit to access the iNEMO M1 using C++, do I need to use the EKF and AHRS source files to get more reliable RPY/Quat data? Or is that already accounted for? #inemo-m1

Posted on June 07, 2014 at 09:58what is the IDE for iNemo development, and where can I download it?

Posted on May 26, 2014 at 09:22How many sensors does the VL6180X contain ? #vl6180x #vl6180x-outline-drawing #sensor

Posted on June 06, 2014 at 01:57Have anybody seen the working example of one? I've got one but can prove it is not designed to be working. Have 2 guesses: it never made one despite promise or I got the wrong file. Any comment welcome. At the moment I suffer of the forwarding this promise to a customer and not getting it work. No further communication was from the device owner. Want to hear even some idea how to approach commonly known way of counting steps based on the crossing the averaged data. Can discuss my approaches. #lis3dsh

Posted on June 05, 2014 at 12:24I try to read both temperature and accelerometer data from LIS3DH. I get accelerometer data but the temperature value is stuck.I have set both  ADC_PD and TEMP_EN in the TEMP_CFG_REG.I would like to have some example code that I can follow.

Posted on June 03, 2014 at 00:50Is it possible to mount two of these sensors about 10 cm apart facing each other, without interference?  And when an object is inserted between the sensors be able to measure the thickness of that object by subtracting the difference?One last question is there example code of how to perform a measurement reading?Thanks! Jerry T. #vl6180x

Posted on June 03, 2014 at 12:54Is there any mean time between failure (MTBF) data available for the LPY430AL? Thanks

Posted on May 24, 2014 at 09:21Hello There,i'm trying to configure the LIS2DH for the free-fall detection. On the Free-Fall LIS should trigger an interrupt on INT1. My configuration looks like that:CTRL_REG1 = 0b00100111;CTRL_REG2 = 0b00000001;CTRL_REG3 = 0b01000000; CTRL_REG4 = 0b10001000;CTRL_REG5 = 0b00000000;CTRL_REG6 = 0b00000000;INT1_CFG = 0b10010101;INT1_SRC = 0b00000000; // Read Only?!INT1_TSH = 0b00011000;INT1_DUR = 0b00110010;it doesn't seem to work propperly ...can anyone help me? #lis2dh #free-fall

Posted on March 04, 2014 at 01:07I am using the LSM9DS0 as a 9DOF IMU for a motion sensing application.  I need the temperature sensor to compensate for temperature-induced gyro drift.  I can get everything to work, but the temperature always reads 0x00 on both the high and low byte.  I set the TEMP_EN bit high and read both high and low OUT_TEMP_XM registers.  I have everything enabled and the mag/acc/gyro all update properly.  I have tried many combinations of settings and still read 0x0000 for temperature.  I have also tried multiple physical parts, so that's not the problem.  Anyone know if there's a known issue with the temperature sensor?  Thanks. Here's the code for my control register settings: LDD_TError set_XM_control_regs() {     LDD_TError I2C_Error;          I2C_Error = Hand_SelectSlaveDevice(MAGNETOMETER_

Posted on May 29, 2014 at 15:15The original post was too long to process during our migration. Please click on the attachment to read the original post.

Posted on May 29, 2014 at 12:33Hi guys/gals,I am new to the iNemo board and to ARM programming in general.I have just bought the iNemo-M1 discovery board, the STM32 programmer by ST, downloaded the firmware and installed the drivers. I have also installed Keil as my IDE.Now I would like to start with just a very simple project which is basically to switch on and off the leds on the discovery board.Can you kindly outline the header files and possible settings I have to do in order to setup a project for such a simple function. I have tried a couple of times but I am still getting a lot of 'undefined' errors.Thanks for your time.regards

Posted on May 28, 2014 at 15:01ST parts with an I2C interface use a restart in a multibyte read transfer.  Instead of a restart, does the more conventional stop, start sequence work with the I2C interface in ST parts? Image is attached.

Posted on May 28, 2014 at 02:57Hi:   I want to enable motion interrupt for accelerometer, but In LSM9DS0 datasheet, there's no description about Duration and Threshold register, Could you give me the example about how to set these two register to enable motion interrupt?   Thanks    Dong 

Posted on May 26, 2014 at 09:13What is the FlightSense trademark, associated to VL6180X ? #vl6180x #flightsense

Posted on February 27, 2014 at 16:52Hi,My raw readings from the accelerometer of the LSM9DS0 MEMS have a big offset in  two axis, it's about 0.15 G in the x-axis and .07 G in the z-axis. i find these offsets about 15% and 7% in these axis are a bit strange, especially when is said that the sensor come calibrated from factory. Could you confirm me if is a normal situation?Regards Miguel Rasteiro