MEMS (sensors)

Posted on October 30, 2013 at 03:02Are the specs for the ADC in the LIS3DH available?  I'm particularly interested in input voltage range, input current, and recommended capacitance for ADC inputs.

Posted on April 08, 2014 at 16:13Hi,Is there an easy way to 'factory reset' the LIS3DH?Does a simple power cycle do this?I looked through the data sheet and app note and could not see this defined there.Thanks #lis3dh-reset

Posted on October 04, 2016 at 12:47Hi How can I start with LIS2DH12 accelerometer programming , is there any tutorial for beginners about the registers ,how they work and how to write a program for them  ? hanks for help #accelerometer-lis2dh12-configure

Posted on September 30, 2016 at 07:49Does anyone know how to change the standard mode to 2V8 mode?I could not find the details in the VL53L0X API manual. #vl53l0x

Posted on October 03, 2016 at 18:03Hi, in datasheet for LPS25HB ('DocID027112 Rev 3'), page 27, the register 'RES_CONF (10h) Pressure and temperature resolution' is described. Question1: Is the 'Nr. internal average' (table 18) applicable for One-shot mode? Q2: If it is so, would be selected Nr.internal average influence on conversion time for One-shot mode at all? Q3: How long would be conversion time in One-shot mode? If there is concerned above influence (see Q2), what is the conversion time, when Nr.internal average=8 and when Nr.internal average=512? Best regards. #lps25hb #pressure-sensor

Posted on October 03, 2016 at 16:26where can I download iNEMOEngine_LI3 source code. I can't find a link to it

Posted on October 03, 2016 at 12:51Distance measured by the sensor is direct value or averaged value? If it is averaged value means then in what way they are averaged ? Is FOV takes major role in averaging?

Posted on September 27, 2016 at 15:34I am using the L3GD20H in an application where I am measuring the angular velocity of a pendulum.  I want to calculate as accurately as possible the kinetic energy.  I have calibrated for gyro zero-offset drift, however non-linarity is causing slightly different reading when the pendulum is rotating clockwise and counter-clockwise.  This is within the range indicated by the datasheet. My question is, how stable is the non-linearity of the gyro with respect to time, temperature etc?  Can I expect to be able to calibrate the non-linearity once for each L3GD20H device and not have to recalibrate in the future? #l3gd20 #non-linearity

Posted on July 19, 2016 at 21:00I had already multiple times the problem that the accelerometer sensor is not providing data anymore. It is connected via SPI, commands like the who_am_i works, however the XYZ data is all zero or just some frozen values. Sometimes only one or two axis, mostly all three.Re-initializing everything does not fix it, only a power disconnect fixes it.How can I do a complete reset, which commands? #lsm303agr

Posted on April 21, 2015 at 17:00Hi I'm just bringing up a VL6180x mounted on a VL6180X-Satellite board with bit banging software. Everything has gone well so far, writing and reading registers etc, for proximity only application. The ranging output goes to a minimum of 18 at 100mm and shows a system error of 2? reading the RESULT__RANGE_STATUS register. I found the AN4545 with the private register writes but this seems to differ slightly to one of your earlier replies to other queries? You have extra register writes! Is there a further update to this list. Also I'm interested in being able to detect approach up to 400mm away and then going to fine approach as the device nears the target. Is this possible? Regards Dave B

Posted on September 26, 2016 at 07:51Hi We manufactured 200 PCS sensor base on HTS221, Now when we test them, Some of them will stop working when they reach up to 80-90 degree C Base on Datasheet, it works in -40 to +120. How they stop working : Some will report invalid degree and it will remain constant. Some will not answer to I2C. and so on. We used SF2 cap, and it's inside the enclosure, so there is no chance for temperature shock. We used our custom heater for +70/+80/+90 degree C adjustment and testing. One of them failed while it was on the back of the car window, In direct sun. Any suggestion ? Does ST test all of the sensors for full temperature/humidity range ? Thanks. #hts221 #hts221-hts221tr

Posted on August 30, 2016 at 11:06What document have package marking information for LIS2DH12? WHO_AM_I =33h same as LIS2DE12 or LIS2DE. Thanks. #lis2dh12

Posted on September 21, 2016 at 17:23I have a quick question about LSM303D. I would appreciate it if you would provide me some suggestions.I am using SPI communication to exact all the magnetic sensor data in 100Hz. ( I configure the SPI baud rate to be 230400bps.) In order to increase dynamic range/signal to noise ratio, I am trying to change the sensitivity based on the received magnetic sensor data value. For example, if the sensor value is getting smaller, I will want to change the scale smaller. If the sensor value is getting close to the threshold, I want to change the scale larger to avoid overflow. Specifically, I am modifying the LSM303D_CTRL6 register value in real time to achieve this objective. What I observe is that there is a period of oscillation of data (or garbage data) almost every time that I changed the sensitivity. Currently, I am simply writing to the register without any wait or acknowledgement. A

Posted on September 20, 2016 at 22:04Here's a snapshot from my logic analyzer showing valid data for the X axis, but zeros for Y and Z.

Posted on September 20, 2016 at 21:12Hello, I am using the AIS3624DQ accelerometer, and I am able to get valid readings from the X axis, but the Y and Z are returning zeroes.I can read out the CTRL_REG1 register, and I see that X, Y, and Z are all enabled.  For whatever reason, X is reporting valid data, but not Y and Z.Any insight?  Or Errata I should know about?Thanks! #ais3624 #accelerometer #stm32

Posted on April 06, 2016 at 13:55Hi everybody, I use a LIS331 with I2C communication. I can read and write the configuration register (CTRL_REG1 for example) but when I want to read any data register, the read value is always zero. CTRL_REG1 value is 07h, therefore the axis are enabled. I have tried to read STATUS_REG and the value is zero. Anyone has had this problem ? Have I forgotten a step in configuration or something like that ?   Thanks in advance.    #lis331

Posted on July 31, 2012 at 20:12We use LIS3DH at 10Hz, with FIFO, low power mode, I2C for communication. We measure current at we get:- at 3.6V supply, 160uA- at 3.0V supply, 100uA- at 2.3V supply 60uAThe datasheet claims 6uA, what might we be doing wrong? #lis3dh

Posted on September 11, 2016 at 21:37LSM9DS1 unable to change FIFO mode #fifo #lsm9ds1 #imu

Posted on September 15, 2016 at 18:59I am trying to optimize the power consumption for bringing the L3GD20 out of Power Down mode, initialize a FIFO acquisition, acquire the data via I2C and then place the device back into Power Down mode. The register requirements to do this are well documented, however the datasheet and app notes are very sketchy on the required power on timing and the time to achieve FIFO data stability.The first decision I am trying to make is whether to switch from Power Down to Sleep then Normal, or go directly from POwer Down to Normal. The power supply current specifications would indicate some potential power savings by transitioning through Sleep Mode, can anyone verify this.The second decision relates to how long to wait after switching to Normal Mode before data becomes stable and can be acquired into the FIFO. Anyone know what the timing requirements are?

Posted on September 13, 2016 at 05:30Hi,Can anyone help me with installing the VL53L0X/P-NUCLEO-53L0A1 GUI on a Windows 10 machine?I'm using UM2072 as guidance but the exe installation is not completing due to me not having ''administrator privileges''. My user profile is definitely an admin and I haven't had any issues installing other software.Section 2.2.3 of UM2072 hints that this may be a problem but the solution offered (changing the program folder) doesn't work for me.Anyone got a work around I can try?Thanks #gui #vl53l0x #p-nucleo-53l0a1

Posted on April 21, 2016 at 18:57I`d like to know how to get samples of the UV index sensor UVIS25, data sheets also indicates the use of a ''Golden Sample'' for comparison, I`ve tried Farnell and Digikey sites but both even don`t know these two products! Maybe somebody can indicate me a place where I can purchase some samples for development. Many thanks #uv #sensors #uvis25

Posted on February 17, 2015 at 06:12Hi all, I need to some advice/help about getting angles by ''L3GD20''. I got the 3-axis angles by integrated angular rate from ''L3GD20''. However the calculated angles were less than real moved angles. The error is large. Is ''L3GD20'' not useful for measurement of angles? Only for angular rate? Do I have to select a accelerometer, ''LIS3DHTR'' and so on?  #l3gd20 #angle #accelerometer

Posted on September 08, 2016 at 12:33Hi,I run an experiment with several LIS2DH12 mems and noticed that there is a small deviation between mems ODR frequency (~2.8%)What is the maximum expectable deviation for this device?I found in other mems Datasheet deviation of +-5% in RC oscillator.Thanks,Dagan

Posted on September 07, 2016 at 15:14Hi, We have been using the LPS25HB in one of our designs.We have an LPS25HB device (soldered onto a flexible flat cable) and a second one, that we use to measure the absolute ambient pressure (soldered onto a PCB), The device on the flexi-cable is not reading the same value when open to ambient. The difference is -8mmHg, ie flexi cable is 8mmHg below the ambient.How can I tell what is causing this difference?I have read about the effects of soldering. I have also read about the factory trimmed calibration that should appear in the RPDS registers. When I read the RPDS on both sensors I get values of 0x00, 0x00 for each sensor.What values should I expect in RPDS, given that each sensor is factory calibrated?I have read about the effects of soldering, but how can I confirm that this is the root cause of the -8mmHg in this case?Cathal

Posted on July 30, 2016 at 02:09Hello, I am trying to access the HTS221 (TR) Temperature Humidity sensor. Firstly, the driver code of this sensor provided by ST Microelectronics states that the I2C address is 0xBE but I had been trying that address for a while and it did not work. Whereas on pinging the I2C port with different addresses, I understood that the sensor I2C address is 0x5F. So, I am using 0x5F address to access all the registers of the sensor. Secondly, Following are the temperature data that I can getting from the calibration registers: T0_OUT = -258T0_degC = 21CT1_OUT = 2570T1_degC = 35.63T_OUT = 30840    // this value looks too high On conversion, the room temperature comes to be 181C. which is definitely wrong. You mentioned about trimming the values in one of the discussion, please let me know about it.