MEMS (sensors)

Posted on December 23, 2016 at 04:42I am a new user of ST’s LIS2DH12. I am confused about the sentence 'Leave “Pin 1 Indicator� unconnected during soldering'. It was in chapter 4.1 Soldering information in datasheet of LIS2DH12. What this sentence mean? And why does Pin1 need disconnect? And how can I achieve Leaving “Pin 1 Indicator� unconnected during soldering?

Posted on December 29, 2016 at 15:42I'm trying to connect SPH0641LU4H-1 microphone to STM32F411RE Nucleo board.According to the Wikipedia https://en.wikipedia.org/wiki/Pulse-density_modulation format should represent lowest and highest amplitude as 0b0000...(all 0) and 0b1111...(all 1) accordingly.When I connect microphone pin to the ground ->  0b0000... PDM data is transferred to PDM_Filter_XX_XX and output sound is silence. But when I connect it to 3.3v source to emulate PDM 0b1111... ->  the output I get is 1KHz noise. (mailto:16bit@16KHz PCM). PDM_Filter_128_LSB function outputs big(depends on micGain) int16_t values with + or - sign.B

Posted on December 21, 2016 at 11:26Hi, I am trying to configure osxmotion library in Juma Canon. I was able to successfully import motionar,motionfx,motioncp,motiongr library in the project but was unable to properly execute the license manager. I am attaching the video link- https://www.youtube.com/watch?v=v35_pLUQQlU . Please help me out.#stm32f401 #library #arm #compile-license

Posted on December 30, 2016 at 08:14Here's my configuration:set(CTRL_REG1, 0x00); set(CTRL_REG2, 0x80); set(CTRL_REG3, 0x00); set(FIFO_CTRL, 0x00); //Flush FIFO set(CTRL_REG1, 0x3A); //3A was 3E set(CTRL_REG2, 0x50); //50 set(CTRL_REG3, 0x00); set(FIFO_CTRL, 0x40);In my code, I wait 2 seconds and read 32 values from FIFO and average them.Then I wait 1 second and read 16 values from FIFO and average them.I do the above in a loop.Pressure data looks find for about 33 seconds, and then, I get junk back.If I restart my device (power down and back up again) it will work fine again, for about 33 seconds.The problem is consistent.  What is going wrong here?To read a single pressure value, I just request 5 bytes from 0x28 and read them in.  I use the first 3 to calculate pressure and discard the last 2 as they are temperature and not necessary for

Posted on December 28, 2016 at 08:23I am designing circuit using LIS2DH12. I want to use the I2c, so I connect Cs to high level, and SA0 to GND. I am not sure if CS should be connected to Vdd, or Vdd_IO. As I understand it, Cs should be connected to Vdd_IO. But I am not sure, so I ask this question, and I need help.

Posted on December 05, 2016 at 20:44Hi.Sorry for my English.specified in the datasheet If a slave receiver does not acknowledge the slave address (i.e. it is not able to receive because it is performing some real-time function) the data line must be kept HIGH by the slave. The master can then abort the transfer. A LOW to HIGH transition on the SDA line while the SCL line is HIGH is defined as a STOP condition. Each data transfer must be terminated by the generation of a STOP (SP) condition.Sensor sets the data line in high. The microcontroller by sending an address sensor receives NACK, and stops communication.After that, registers AV_CONF, CTRL _REG1, CTRL _REG2, CTRL_REG3 reset to its default state (All read operations read the default values).This situation occurs if the ODR> 0. (1 Hz 7 Hz 12,5 Hz)Why is this happening?How do I check the conversion is complete without R

Posted on December 23, 2016 at 07:27Hi, I am new to LSM6DS3 inertial module, I am trying to use it with my arduino mega 2560, in SPI mode ,but in trouble with  Z & Y axis output of the accelero meter. X axis output respond well.Already tried to read the output raw registers with and without reading the STATUS Register, but the result remains same.  I bought the breakout board from Sparkfun and made necessary changes for using this in SPI mode. Attaching my arduino code with this post.

Posted on December 21, 2016 at 20:32Hi,I have connected an FPGA to an LPS331ap, and I can retrieve good data as seen in the oscilloscope, but only if the supply voltage is above 2.4V (I have Vdd and Vdd_io shorted together), rather than the 1.71V quoted in the data sheet. The logic signals from the fpga are 1.8V, however. I am also using SPI.For my application, I would like to minimize power consumption and thus minimize the supply voltage.Has anyone else observed observed this higher-than-spec necessary supply voltage, and found a way to get it to work with supply as low as Vdd=1.8V?Thanks

Posted on December 20, 2016 at 17:32I am using the LSM6DS3 component in a design. I've used the component in the past (and always liked it), but never in this capacity. I am using I2C for communication with 10k pull up resistors and am powering on/off the sensor with a separate power bus than my micro controller. I have the interrupt pins connected to my micro controller, although they are not in use. The issue I am experiencing is that when the power for the sensor is turned off, the I2C lines are being pulled low. When the power for the sensor is pulled high, the I2C lines are high as expected and I can communicate to other peripherals on the I2C bus. In effect, powering down the sensor is pulling down the entire I2C line, drawing extra current in my system and preventing other I2C communication. Is this a problem you can provide insight on? I wasn't sure if the module supported this mode of operation, where

Posted on December 17, 2016 at 06:48Hi, i searched for the exact principle of the time of flight technology in internet but the answer i got was different in different websites. I bought VL53l0X sensor recently and i need the exact principle of TOF of ST's product.

Posted on November 04, 2016 at 15:57Hi,I would like to use IIS2DH accelerometer as main accelerometer in a custom board for my project. For this reason I've bought the STEVAL-MK1168V1 to make some tests. I would like to ask you some questions about this product, since they are not well specified in the datasheet I've downloaded from the product page site.1) I usually program with Atmel microcontrollers, so I've made the same this time. What I've done is to link both i2c pins, Vdd and Vdd_io to Vcc=3v3, GND and both INT1 and INT2 pins. i2c communication works fine but i can't handle interrupts generated through INT pins.I set the Int1_cfg register to binary 00111111 (OR combination of all axis events), the I1_A01 bit on ctrl_reg3 to 1 and, after moving the board, I cheked the int1_src register I've seen that IA, ZH, YH, XH bits are set, so what I've expected was an interrupt on INT1 pin, but the corresponding callbac

Posted on December 15, 2016 at 10:23Hi there,   According to the datasheet of LSM303D, I could find the self-test function of the accelerometer, but could not find the same function of the magnetometer.   How to test the magnetometer if no build-in self-test function provided?Best Regards,Cheng#lsm303d-self-test #lsm303d

Posted on December 15, 2016 at 16:25Hi Everybody, I want to test the interrupt of the LSM6DS3 sensor without any movement. Do you know if it is possible to generate an interrupt with the sensor self test ?If I program a low interrupt threshold and I launch the self test of the sensor, is it possible to see the interruption ?Thanks a lot for your help.

Posted on November 28, 2016 at 17:59Hi everybody,We are using LIS3DS0 on the ISK01A1 board monted on a Nucleo F103-RB...Our software is based on HAL drivers (got in the cube).We met this strange issue in some of our boards (we confirmed the test with many students and dozens of boards):1- we plug the board2- the accelerometer failed to initialize. (due to the WHO_AM_I register which is 0xD4 instead of 0x68).We can reset again and again our STM32, without any change.Then we program a flush of registers of the LIS3DS0.We confirm the registers seems to correspond to another component (L3G3200D) !(WHO_AM_I of 0xD4, )But, when we do the following steps, the component run well :1- plug the board2- -> fail to initialize3- get off the JP2 jumper4- ensure temporarly 0V on the Vcc of sensor (with wire) (to avoid a 2V power by

Posted on November 02, 2016 at 23:14Hello Everyone,I am having trouble talking to the LSM6DS3 using 4 wire SPI. I have verified the signals to the device as being correct per the datasheet. I am commanding 0x8F to do a WHO_AM_I command but am not seeing anything coming back on MISO. The only problem I can think of is the SCx and SDx pin is left open. I did not tie them to VCC or ground. Could this be the problem? Due to the package, I can't modify it on board. 

Posted on August 10, 2016 at 06:08I brought STEVAL-MKI160V1 MEMS sensor board. Bulk ID Z5T42380E024. While working with the sensor I got an issue like I enabled interrupt generation to interrupt pin INT1 for 6D orientation detection. So when ever I change the orientation, interrupt is generated and interrupt pin INT1 is going from low to high state. But it is not going back to low state for detecting the next interrupt detection. INT1 pin is maintaining high state even if I again change the orientation to first or previous state. My doubt is, is there any register or bit in a register to be programmed to make the interrupt pin INT1 becomes low and be ready automatically to serve next interrupt detection? Is this feature available in LSM6DS3 sensor? #interrupt-lsm6d3s

Posted on February 26, 2014 at 03:15Currently, I am now using LSM330, the only reference driver I found is official Linux-OS driver. Since there's no programming guides, I search website for source code for reference, only to find that all source code I found have a different register definition.For instance, in a project in github, among the initialization code block, the author wrote the code below:    this->setAccelSensitivity(accelSensitivity);        // Check the datasheet (p29)    // Normal (1.344 kHz) / low-power mode (5.376 kHz) data rate    // Normal mode selected (default)    // x,y,z axis enabled (default)    writeRegister(

Posted on February 04, 2014 at 08:30How does one configure the data ready interrupt on the H3LIS331DL accelerometer? I've configured other accelerometers like LIS3DSH with success but I am stuck on this one.I've tried both latched and pulsed interrupts, I've configured the signal on both INT1 and INT2 to the Data Ready on the configuration register but it doesn't seem to do anything. I would appreciate any guidance, I can post the code if needed.Thanks in advance!! #h3lis331dl-data-ready-interrupt

Posted on December 12, 2016 at 14:54Can somebody share linux device drivers for kernel 3.7.6 drivers for lsm6ds3

Posted on December 09, 2016 at 21:27  I tried to use LSM6DS3's Accelerometer X/Y/Z-axis user offset correction registers(X_OFS_USR: 0x73, Y_OFS_USR: 0x74, Z_OFS_USR: 0x75) to hardware compensate its accelerometer measures to save my host CPU loading, but I found they will stay at zeros after writing with any non-zero values(-127 ~ 127 as specified at page 88-89 in your specification of DocID028475 Rev 4, June 2016)?  Have someones used LSM6DS3's built-in hardware offset registers and  solved the above problems?  On the other side, MAG_OFF X/Y/Z can be written after enabling access to Embedded Function Register (FUNC_CFG_ACCESS), but it randomly changes, e.g. changing between 180 and 206 deg while the module is statically pointed to 180 deg.  If I zero MAG_OFF X/Y/Z registers and manually apply offset compensation(mag measure - bias), then the compensated direction is correct and fixed at 180 deg without

Posted on December 11, 2016 at 07:25I have connected LPS22HB development kit (STEVAL-MET001V1) and Raspberry Pi 3 with I2C interface and tried to read pressure and temperature data but whatever setting I tried, pressure (0x28, 0x29, 0x2A) and temperature (0x2B, 0x2C) always gives me 0xff. I tried one shot (CTRL-REG1 0x00, CTRL-REG2 0x11) and also continuous (CTRL-REG1 0x12, CTRL-REG2 0x10) but these didn't make any difference, and I can read WHO AM I register and all other registers but pressure and temperature output always 0xff, 0xff, 0xff,0xff, 0xff (with single byte read or dump). I am sure I did something wrong but can't figure this out. Has anyone experienced something like this? Register 0x27 shows 0x03 but I still can't read data out (0xff).. Please see the attached screenshot for dump data.I hope someone could help me to make this chip work..Regards.

Posted on November 29, 2016 at 23:46Hi support,We wonder if there is any register configuration that allow us to route the motion detection to the INT1 pin and the free-fall detection to the INT2 pin and both working at the same time? Both pins are routed/connected to our uP and we need to have these two features enabled and working at the same time.Thanks in advance

Posted on November 02, 2016 at 07:41What is the actual data (x,y,z) length. When I'm reading the acceleration data , the lowest 4 bitsare 0. This would indicate the data is actually 12bit , left justified. The datasheet however say's the FIFO is 10bit.Does this mean that the actual usable data is 10bit? CheersNeddie

Posted on January 12, 2016 at 15:18Hello, I need help with regard to extending the 4 microphone architecture of X-CUBE-MEMSMIC to 6 microphones using X-NUCLEO-CCA02M1 and STEVAL-MKI155V3. I have attached the modified BSP driver .c and .h files. Also in audio_application.h I have changed the no. of microphones to 6. I have tried to configure SPI3 for microphones M5 and M6. I see that slave select for both SPI1 and SPI3 are the same and since the slave select is not being used in this case, I know this shouldnt be a problem. Can you please let me know which all part of the code should I look into to get it working for 6 microphones. I have also tried to increase the PDM buffer but have not been successful. I see that PDM data is available on scope on all the 4 microphones but due to changes from my part of the code the data is not being recorded. Apart from the x_nucleo_cca02m1_audio_f4 BSP driver which part I should look into to ext

Posted on September 07, 2016 at 10:40Hello,I saw that MP23DB01MM is used in BlueCoin  device. I would like to investigate this microphones characteristics but  could not find a data sheet. Please could you redirect me to data sheet web page ?Thanks in advance.Regards,Abderrahman #mp23db01mm-datasheet