MEMS (sensors)

Posted on August 04, 2016 at 10:48HTS221 after read all humidity registers final value always 29.0% and not changed in time. All data register contain 0xAE values. ST firmware driver for HTS221 also returned 29.0% and 0xAE registers values. Connection diagram of the standard, according to datasheet. Tried several sensors, one and the same. sorry for my english.

Posted on August 04, 2016 at 11:54Hi,I'm working on lsm9ds0 and spi with a stm32f4. The accelerometer and gyroscope work successfully on my device but since a few days, the magnetometer seems to get random values. For test, gyroscope is in power down mode. This is my configuration : lsm9_driver_write_register(LSM9DS0_CTRL_REG1_XM, (0x60)|(0x07)); // ODR 100HZ, enable all axis, continuous update lsm9_driver_write_register(LSM9DS0_CTRL_REG2_XM, 0b00100000 ); // ±16 g lsm9_driver_write_register(LSM9DS0_CTRL_REG5_XM, (0x80)|(0x14) );//  temp enable, low resoluation mag, 100Hz ODR lsm9_driver_write_register(LSM9DS0_CTRL_REG6_XM, 0b00000000, ); // ±2gauss lsm9_driver_write_register(LSM9DS0_CTRL_REG7_XM, 0b10000000); // normal mode lsm9_driver_write_register(LSM9DS0_OFFSET_X_L_M, 0x00); lsm9_driver_write_register(LSM9DS0_OFFSET_X_H_M, 0x00); lsm9_driver_write_reg

Posted on July 30, 2016 at 18:46I have a problem with the accelerometer noice, I feel that 100mg noise for the mode 2G, 10 Hz-Normal, BDU, HR (12bits) is way too much. In my setup I use your STEVAL board on an idle table without any vibration doing measurements for about 10 seconds.Here are my results.00:05:04.309034 XYZ: X(-0.9682) Y(-0.0167) Z(-0.2519)00:05:04.410438 XYZ: X(-0.9702) Y(-0.0147) Z(-0.2440)00:05:05.511833 XYZ: X(-0.9722) Y(-0.0157) Z(-0.2528)00:05:05.613250 XYZ: X(-0.9722) Y(-0.0127) Z(-0.2528)00:05:05.714657 XYZ: X(-0.9702) Y(-0.0137) Z(-0.2499)00:05:05.816065 XYZ: X(-0.9702) Y(-0.0098) Z(-0.2568)00:05:05.917417 XYZ: X(-0.9702) Y(-0.0137) Z(-0.2519)00:05:05.188270 XYZ: X(-0.9673) Y(-0.0167) Z(-0.2509)00:05:05.120178 XYZ: X(-0.9722) Y(-0.0118) Z(-0.2489)00:05:05.221579 XYZ: X(-0.9

Posted on July 27, 2016 at 07:20Hi,I try to get power consumption about 10 uA using LIS331HH in low-power mode (power supply voltage 3V). But I've got 23 uA average power consumption in low-power mode (0.5 Hz data rate).Working cycle: sleep (power consumption about 5 uA) 2 sec - ''wake-up'' (290 uA) less than 0.1 sec - sleep (5 uA) 2 sec -...and so onSo, result is about 23 uA, but target power consumption is 10 uA (datasheet). What should I change?Power consumption in power-down mode is less than 1 uA (tested).

Posted on July 19, 2016 at 21:08I try to turn off the accelerometer by SPI commands to use only 1uA according to the spec. I have not found any SPI commands to turn it off to reduce power consumtion to about 1uA, everything I tried  still needs about 150uA. #lsm303agr

Posted on August 02, 2016 at 09:55Hi, For a solution we want to use the LPS25HB in a liquid environment. In our opinion, the best way to do this is by installing the sensor in an oil filled case with a thin metal membrane on the top. On this way the pressure is passed on to the sensor in a linear way and without much loss. Does anyone know if this would be possible? Or is the sensor only suitable in dry conditions? In the application note, AN4672 (attached), is shown how to protect the sensor with membranes. For example: But I'm wondering if this implementation is realistic. Is it possible to pass over the pressure to the s

Posted on July 26, 2016 at 06:19Should my program get 1000 mg when F3 Discovery Board is in steady state on a horizontal surface? Measurement range = [-2g;+2g]; Linear Axeleration Sensitivity = 1mg/LSB; High Resolution Mode I get 15344 mg (0x3BF0) and -16912 mg (0xBDFO) when the board is upside-down.

Posted on April 22, 2015 at 09:20We use an L3G4200D rate-gyro in our project.Part of the setup involves acquiring calibration data from the sensor (zero-rate drift versus temperature as reported by the sensor itself).After applying the collected calibration data in the application software we observe the following issue:- Whenever we power-up and initialize the sensor there is a random chance to get a different zero-rate drift behavior compared to the calibration data previously collected- There seem to be two different states, one which matches our calibration and another which does not- The residual drift in the ''alternate'' state seems to be repeatableWe suspect the sensor may be randomly loading (or not loading) a factory calibration table on power up.If we detect the ''bad state'' we can power-cycle the sensor one or more times (via CTRL_REG1) until we get the state wh

Posted on July 27, 2016 at 23:17Hello, We are using lsm6ds3 sensor by connecting to STM32F103 controller through I2C communication. Over I2C to read both X and G Raw data taking around 800uSeconds over 400K speed. In one of my new project, needed both X&G raw values for every millisecond.For fast reading, thinking to use SPI communication instead of I2C communication. Provided examples with in X-CUBE-MEMS1 are based off I2C, is there example any examples for SPI connection?Regards,Jim #lsm6ds3 #stm32f10x #4-wired-spi

Posted on July 17, 2016 at 14:04Hello everyone, I can not understand how they obtained the equation 2 p. 7 the following document: Can anyone explain me? Thank you and greetings. #ecomapass-tilt-lsm303dlh #ecompass #tilt #lsm303dlh

Posted on July 16, 2016 at 21:04Hi, I try to get the pressure data in One shot mode. I read the state of Reg Who am I (0Fh)=B1h Ctrl_Reg1 (10h)=00h, Ctrl_Reg2 (11h) =10h, then I write to Ctrl_Reg2< 11h, to provide One Shot Mode, Now continuous reading of this Ctrl_Reg2(11h) = 11h (no reset bit OneShot after conversion) Reading of Status (27h) =00h Pressure Data (Regs 2Ah:29h:28h) = 2F6666h I may only write default value to Ctrl_Reg2 < 10h Now reading of Ctrl_Reg2=10h, but no changes in Status and Pressure data.   The document 'AN4672 Application note LPS22HB/LPS25HB digital pressure sensors: hardware guidelines for system integration', pages 19,20, proposes special procedure for one shot mode, using some CTE bit in Config Reg (43h), but this register is not described in LPS22HB datasheet and it is not

Posted on April 12, 2016 at 12:22Hi, I have recently acquired an STEVAL-MKI094V1 and can't find the software downloads for this board on the ST site.  Can anyone advise where I might find please.  I need either for Mac or PC, Mac preferred but PC will do.ThanksRay #software-mki094v1

Posted on July 15, 2016 at 12:08Hello, I just received the wesu board and I using it ''as it is'' with the related android app ST WeSU. What I'm facing looking at the cube on the app is that there is a very high drift of the cube itself. In details: if I move the board I see the cube moving coherently but when I put the board in a stable fixed position I see that cube take a very long time (up to 10/12 seconds, depending on the previous movements) to reach a fixed stable position. What could be the root cause? Thanks in advance Fabiano #wesu-drift

Posted on June 28, 2016 at 17:56I'm trying to use LSM9DS0 as a vibration sensor using accelerometer data, but I have some questions regarding the datasheet:1. Do I need to have magnetometer activated in order to use 6D in INT_GEN_1_REG? If I don't and I only have ACC enabled, does this 6D flag make any difference?2. I'm using 0.1G as a threshold (write 0x06 in THS, for +-2G scale) and it only works if use OR with XLIE, YLIE and ZLIE in INT_GEN_1_REG. If I start putting the high events (e.g. XHIE) then I don't get any interrupt. Why is that?What's the best way to use this as vibration sensor? This system will be stationary inside a car and I would like to wake up my MCU when the car starts (and, consequently, vibrates). False wake ups are not a problem.

Posted on July 18, 2016 at 16:01 I have an X-NUCLEO-IKS01A1 board. There is a LSM6DS0 on the board but the following functions DrvStatusTypeDef BSP_ACCELERO_Enable_Free_Fall_Detection_Ext( void *handle ); DrvStatusTypeDef BSP_ACCELERO_Disable_Free_Fall_Detection_Ext( void *handle ); DrvStatusTypeDef BSP_ACCELERO_Get_Free_Fall_Detection_Status_Ext( void *handle, uint8_t *status ); DrvStatusTypeDef BSP_ACCELERO_Set_Free_Fall_Threshold_Ext( void *handle, LSM6DS3_ACC_GYRO_FF_THS_t thr ); DrvStatusTypeDef BSP_ACCELERO_Enable_Pedometer_Ext( void *handle ); DrvStatusTypeDef BSP_ACCELERO_Disable_Pedometer_Ext( void *handle ); DrvStatusTypeDef BSP_ACCELERO_Get_Pedometer_Status_Ext( void *handle, uint8_t *status ); DrvStatusTypeDef BSP_ACCELERO_Get_Step_Count_Ext( void *handle, uint16_t *step_count ); DrvStatusTypeDef BSP_ACCELERO_Reset_Step_Counter_Ext( void *handle ); DrvStatusTypeDef BSP_ACCELERO_Set_Pedometer_Threshold_Ext( void *handle, uint8_t thr ); DrvSt

Posted on April 19, 2016 at 12:14Hi, from where can i get the sample codes to use LSM6DSM gyro sensor. ? nothing is listed in the product page. Thanks Vijesh

Posted on June 24, 2016 at 11:23Hi all, I have some questions regarding the LSM9DS1: 1. The Acceleration ODR choices go down to 10 Hz, however the bandwidth selection, presumable an anti-aliasing filter, is limited to 50Hz. Thus, when sampling at 10Hz or 50Hz with a bandwidth selection of 50Hz severe aliasing is to be expected. Is there a way to avoid this? 2. The accelerometed digital filter operation is not documented properly. What dow ''high resolution'' refer to? How is LPF or HPF selected? 3. Is there a block diagram for the acceleration signal available, similar to Figure 28 in the datasheet for the gyro signals?

Posted on December 09, 2012 at 14:41Hello, I'm trying to get the MEMS Accelerometer on my STM32F4 Discovery Board to run with a simple code, but I don't make it. Heres my code: int main(void) {         SystemInit();         GPIO_InitTypeDef GPIO_InitStructure;         SPI_InitTypeDef  SPI_InitStructure;         RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD | RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOE , ENABLE);         RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);           //Init SPI-Pins           GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;

Posted on December 23, 2015 at 02:58Hi, I would like to use the osxMotionFX for the STM32L053 Nucleo board I have. Any plan for a release? It seems to be working only on Nucleo F401RE. Also when I install the osxMotion Setup V1.4.0, I get an error message during the license wizard installation ''floating point 0''. Anyone had the same issue? Thanks, Pierre

Posted on November 01, 2015 at 15:25Hello,this is my first time that i use gyroscope on stm.so please, can you answer this simple question:what are the libraries that i should add to the project to use gyroscope?thank you for answering

Posted on August 12, 2015 at 22:51Hello I'm trying to use the L3G4200D Gyroscope to measure the pitch in 3 dimention.But I faced a problem with: I used the Keil's examples.Iuse SPI to read and write on the device...I can read some registers such as WHO_AM _I  etc. I also used these control register configuration: Gyroscope_Write(CTRL_REG1, 0x0F);     /* ODR: 100Hz, Cut-Off: 12.5,         */ Gyroscope_Write(CTRL_REG4, 0x00);     /* Continuous update,full scale 250dps*/ Gyroscope_Write(CTRL_REG5, 0x40);     /* FIFO Enable                        */ But I can't read state registers(X, Y, Z).My problem is that the result read from the gyroscope is not stable at all where it is

Posted on November 26, 2015 at 10:49Hello,I'm integrating an L3GD20 gyro into a device, to replace a different gyro.  For X, Y and Z, everything is fine, but the temperature is not.If you look at the attached jpeg picture, this is a graph from when the device was tested in the test oven.  The red and blue lines are the temperature readings of the old gyro (red line) and the secondary CPU (a 8051 based RF controller, blue line).  Both of these lines more or less track what the oven was doing during the test.  The L3GD20 seems to be running backwards.  However, on the datasheet it reads ''Temperature data (1LSB/deg - 8-bit resolution). The value is expressed as two'scomplement.''  I did some searching for this on the internet, and found a couple of Arduino sites which discussed similar behavior, but with no solution.The reading is being done by SPI done by an FPGA. &n

Posted on February 11, 2016 at 17:24Hi, I've tried to upgrade the firmware via DfuSe Demo, but it hungAfter this, I've discovered that my STEVAL-MKI109V1 board has bricked.I can flash it again using a Nucleo Board's embedded STLink. I could test it and I've read the memory contents, so I am very confident about being able to write a binary on it.Is there someone who could send me a binary image for this board?PS: I've tried to extract .hex images from .dfu files inside ''stsw-mki109w.zip'', but all of them are bigger than 64kB (the size of STM32F102R8T6 that is on MKI109V1 board)

Posted on March 23, 2016 at 09:22Hello, I am working with STM32F429 Discovery evaluation board. I have interfaced LSM6DS3 with evaluation board over I2C. LSM6DS3 provides good functionality of reading steps counts from it directly without putting more effort on Microcontroller side. Currently I am trying to measure Stairs count using LSM6DS3. Please try to address my below queries. 1) Is there any library available to calculate stairs count for STM32F429 and LSM6DS3? 2) If library is not available then please provide some references regarding how to count stairs count from LSM6DS3. It would be more appreciable if any kind of suggestions will be got. Thanks, Bhavin

Posted on July 03, 2016 at 07:07What is the maximum voltage of the L3G4200D INT1 pin (assuming open drain)? What does the PP_OD bit in CTRL_REG3 control - INT1 only or INT1 and DRDY/INT2? What are the maximum voltages applied to all I/O pins? Why are ST's datasheets SO BAD?  This part has been in production for 6 years.  There's no excuse for not documenting it. #l3g4200d