MEMS and sensors

Posted on August 10, 2016 at 16:45I have downloaded STM32F4-Discovery_FW_V1.1.0 firmware package and want to use the example of Audio Playback and Record on STM32F411.I am facing a lot of problems in building the project itself such as C:\CooCox\CoIDE\workspace\AudioTry6\Drivers\STM32_USB_Device_Library\Core\inc/usbd_def.h:27:23: fatal error: usbd_conf.h: No such file or directory and so on.Can somebody please help in organizing the project such as header files, source files, compiler options, linker options.Proper documentation is also not available. Links to either documents or direct help would be highly obliged. #usb-mic-stm32f4discovery #audio-processing

Posted on August 10, 2016 at 14:17Hi, We are looking for the product&sharpLSM9DS1, where it mentions sensitivity of 8.75mdps/LSB @ �250�/sec range. I would like to know the sensitivity at �125�/sec Range? Is it half of 8.75mdps? Is the range of �125�/sec configurable in Part&sharpLSM9DS1? #gyroscopes #lsm9ds1

Posted on August 09, 2016 at 00:05What is the recommended land pattern for LIS2HH12TR (LGA12)?

Posted on August 09, 2016 at 19:00I’d like to understand some basics, how to work with the device. I read the data from the chip and see it on terminal but I don’t understand how to practically use the data. Also when I use ACC data and when I use GYRO data? Is there some literature to read how to work with accelerometer? Somebook – accelerometerfordummies?

Posted on March 29, 2016 at 08:06Interested in purchasing the LSM6DS3 device. Studied the datasheet carefully, and there is no information on ADC resolution for the accelerometer and gyro. This is odd considering this is a key spec for any prospective buyer.  The datasheet does report temperature sensor resolution (12-bits), but for my project, this would be too low for the IMU readings. Can ST shed light on this? #resolution #adc #lsm6ds3 #imu

Posted on April 14, 2016 at 01:24Does anyone have information on the LAM6DS3 cross axis sensitivity? I cannot find this on the data sheet, when this is supposed to be a standard spec on other similar products. I contacted online support and they asked for an NDA??

Posted on April 14, 2016 at 09:52Hi everybody, I'm using LSM6DS3 and I need to know its resonance frequency. In the datasheet this information is not present. Thanks in advance #lsm6ds3-resonance

Posted on August 07, 2016 at 13:03Hello,1.according to section 2.11 Temperature sensor :should i read both OUT_TEMP_L (0Ch) & OUT_TEMP_H (0Dh) ?the data is stored only in OUT_TEMP_H (0Dh) ?2.the data i get using OUT_TEMP_H (0Dh) is too low (10C-13C), where the room temperature should be about 20C, am i reading the data wrong?RegardsAmir  

Posted on August 05, 2016 at 23:23Hi All,I am working with a LPS25HB sensor and am not able to get valid data out for the pressure or Temperature. Here is a register dump of my settings (tried 2 different settings):LPS25HB reg dump:0x08 , 0x0B0x09 , 0xA80x0A , 0x3F0x0F , 0xBD0x10 , 0x050x20 , 0x900x21 , 0x000x22 , 0x000x23 , 0x000x24 , 0x000x25 , 0x000x27 , 0x330x2E , 0xCF0x2F , 0x200x30 , 0x000x31 , 0x000x39 , 0x000x3A , 0x00LPS25HB reg dump:0x08 , 0xF00x09 , 0xA80x0A , 0x3F0x0F , 0xBD0x10 , 0x050x20 , 0xA40x21 , 0x000x22 , 0x000x23 , 0x000x24 , 0x000x25 , 0x000x27 , 0x330x2E , 0xCF0x2F , 0x200x30 , 0x000x31 , 0x000x39 , 0x000x3A , 0x00

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

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