MEMS and sensors

Posted on January 05, 2016 at 19:50halloi use in stm32f4 with Keil uVision5 and STM32CubeMX(i cunfig spi with cubemx ).i want to send and receive data from accelerometerI can not find the SPI function that send/receive data because i search fanctions that Suitable working with cubemxIs it possible to attach the function and code sampleThank you,pini

Posted on January 12, 2016 at 11:12    Hello!I want to ask that is there any type of ST sensor to measure pressure in the water? I want to use the tiny sensor to measure the intracranial pressure.

Posted on January 11, 2016 at 11:04 Hi everybody, I have a custom board hosting anLSM6DS0 sensor and an STM32F427 micro which communicate via SPI. The SPI interface is configured as follow: SPI5h.Instance = SPI_MEMS; SPI5h.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16; /* 5 MHz */ SPI5h.Init.Direction = SPI_DIRECTION_2LINES; SPI5h.Init.CLKPhase = SPI_PHASE_2EDGE; SPI5h.Init.CLKPolarity = SPI_POLARITY_HIGH; SPI5h.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE; SPI5h.Init.CRCPolynomial = 7; SPI5h.Init.DataSize = SPI_DATASIZE_8BIT; SPI5h.Init.FirstBit = SPI_FIRSTBIT_MSB; SPI5h.Init.NSS = SPI_NSS_HARD_OUTPUT; SPI5h.Init.TIMode = SPI_TIMODE_DISABLE; SPI5h.Init.Mode = SPI_MODE_MASTER; At startup I firstly check if the module is present reading successfully the WHO_AM_I register, then I try to configure theCTRL_REG6_XL register to enable the accelerometer. So I perform the following write/read operations

Posted on January 10, 2016 at 15:18Hello ST Community,I would like to share with you the exiting announcement of the imminent start of the open source project AdaPilot, a safety critical autopilot for unmanned systems (drones) based on the Ada-SPARK language and STM32 MCUs.I would welcome to everyone to visit the website (work still in progress) adapilot.likeabird.eu and in case of interest to contribute in this project.The sensors in the AHRS of AdaPilot uses also ST products.Cheers,-Jarno

Posted on January 06, 2016 at 07:42I'm using LIS3DH_driver project from ST to read axes values from LIS3DH accelerometer. I'm not using STM32 but I have implemented my own LIS3DH_ReadReg() and LIS3DH_WriteReg() functions somehow and they are working without a problem since I can write and read back registers correctly. But the problem is when I call LIS3DH_GetAccAxesRaw() function to retrieve axes values and print them out I don't see a correct value and they are not changing when I hit the accelerometer by thumb and they're really high values even when the board (or the IC) is not moving at all (when I'm not clicking). I have enabled FIFO mode and data rate is 50HZ and WHO_AM_I is 0x33 which is correct I believe. I have not configured any interrupt pins cause I don't need it's functionality. I couldn't figure this out by myself. Anybody have an idea? 

Posted on December 31, 2014 at 08:09 Hello all, I'm having trouble using the AIS328DQ accelerometers. Having the board level I should get roughly 0,0,1 for the x,y,z axis. Every second or third reading is completely incorrect. Often it's zero, sometimes it's much higher than it should be (often up to 2g). This affects all axis. I'm using I2C to communicate. Here is an example of the output -0.01 0.01 -0.02 -0.01 0.01 1.01 -0.03 0.00 1.01 -0.02 0.00 1.00 -0.01 -0.01 1.01 -0.03 0.01 -0.01 -0.01 0.01 -0.02 -0.01 0.00 0.95 -0.02 0.01 1.00 -0.01 0.00 1.07 -0.01 0.00 -0.01 -0.00 0.01 1.01 -0.02 0.01 1.00 -0.01 0.00 1.00 I have checked the I2C bus with a scope and that looks normal. The processor is correctly interpreting the data, it's just that the data is often wrong. The accelerometer is in normal power mode at 1000hz ODR with all axis enabled. The scale is set to +/- 4g. The accelerometer is being read at a 10hz rate, b

Posted on December 30, 2014 at 10:31helloI'am trying to develop an application for voice synthesis using STM32 F4 discovery .for this work i used the project Audio_playback_and_record .however,when i modified the PCM code of const uint_16 AUDIO_SAMPE  

Posted on December 29, 2015 at 08:07Hi all,i want to read Acc value of LIS3DSH on KIT STM32F407 Discovery. I read sensor datasheet. I write data to registor. But i can't get anything from sensor.How to communication LIS3DSH? set REG3, REG4, REG5, REG6 ? And any code example. (i use HAL library)Anybody help me. Thank all #accelerometer #lis3dsh

Posted on December 28, 2015 at 23:18Is it possible to get some clarification on the performance distributions documented in the datasheet?  If we were to calibrate a zero point and a (gain) two point cal for temperature drift per axis, are those parameters stable once a specific part has been manufactured, or can a single part drift over time the full range of the performance distributions? #lis344alh

Posted on December 14, 2013 at 09:40what is the meaning of these registers? no explanation on datasheet. only that table: #msp430f5529 #i2c #lsm303dlhc #lsm303dlhc

Posted on December 28, 2015 at 06:58MCU: STM32F429NHi. I know from datasheet that spi should be configured as mode3 (CPOL=1, CPHA=1), but its working only with mode 1 (CPOL=0, CPHA=1)In mode 3 -  x-axis is stuck with value: -32624. Someone know the problem?spi config:   Accl_SpiHandle.Instance               = SPI4;  Accl_SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16; //2.8Mhz (MAX from datasheet is 10MHz)  Accl_SpiHandle.Init.Direction         = SPI_DIRECTION_2LINES; // Need bidirectional here for read and write.      Accl_SpiHandle.Init.Mode = SPI_MODE_MASTER; // Stm32f4 should be the master  Accl_SpiHandle.Init.DataSize          = SPI_DATASIZE_8BIT; // we send 8 Bits  Accl_SpiHandle.Init.NSS      

Posted on August 03, 2015 at 12:37Good morning,I'm trying to set up a LPS25H sensor to read the same value as another one, which is the reference, in a controlled environment. My first guess has been to set up REF_P registers as the difference between readings from the 2 sensors which is initially stored by firmware. I set up REF_P registers, I enable the DIFF_EN bit in CTRL_REG1 (while sensor is disabled) and finally I enable the sensor again.The problem is that measures coming from sensors still differ for the same amount of pressure,  while if I subtract the previously evaluated difference by firmware readings are very near.Could someone please describe the correct procedure to setup differential mode?Thank you,Andrea

Posted on December 15, 2015 at 14:07Hello,I'm reading the LIS2DH datasheet but I'm not sure of how can I do it:I've got a microcontroller connected to LIS2DH, including the INT1 and INT2 pins. I want to generate an interrupt when accelerometer detect a certain amount of movement in any axis. For example: if the acelerometter is in a door, if I open the door so slowly, nothing happens, but if i open the door more quickly one interrupt is generated (LOW to HIGH in INT1).Can I do it? How? What interrupt have I to activate? I have seen a REFERENCE/DATACAPTURE register, I think i have to put here my ''amount of movement''. But i don't know how can I activate it, i see watermark interrupt, click interrupt, AOI interrupt, but i don't know.Any suggestions? Thank you very much in advance #lis2dh #accelerometer

Posted on December 08, 2015 at 13:54I'm using a LSM9DS0 wired to communicate with I2C. The chip seems to recognize when its being addressed, ACKs bytes, responds to reads, etc. but the problem is it always sends the same byte back. For example: I attempt to configure the device through the following sequence:0xD4 0x20 0x7F 0x04 0x08 0x00 0x40where D4 is the gyro address and 20 is the starting register. I then perform a read of 5 bytes to ensure that the device is configured as I want it to be but receive only five instances of 0x40. The pattern seems to be that the last byte written to a register is simply repeated over and over by the chip. The only exception is when reading the WHO_AM_I registers which respond as expected.Has anyone else had this problem or have any ideas as to what might be going wrong? #i2c-lsm9ds0

Posted on August 20, 2014 at 03:35Hi,I have the LIS3DH setup to trigger interrupt 1 when '6 direction movement recognition' on all axis using HP filter example on application note page 24.This works well.After being set I read the HP_FILTER_RESET and also the INT1_SRC which resets the filter position and clears the interrupt, ready to sense movement again.If I disable the LIS3DH with 0x00 in ctrl_reg1 while the interrupt is triggered, the interrupt stays triggered (it is active low, so it stays low). If I read the HP_FILTER_RESET and also the INT1_SRC the interrupt does not reset.(1) Is there any way to clear the interrupt like I can do when the LIS3DH is 'enabled'?(2) My goal is to reset the interrupt (to high state since it is active low) after it has been triggered and disable it  even if the device is still moving. Is this possible?

Posted on June 22, 2015 at 11:42Hello, i'am looking for a samplecode to use two vl6180x (1. satel & 2. vl6180x on the expansion shield)  on my Nucleo-Board (F401RE)? It is possible to connect two satels to the nucleo? Sincerely, Denis

Posted on November 25, 2015 at 22:13I have bought a Sparkfun VL6180 Sensor Board and connected it to a STM32F415 MikroE Mini M4 MCU.  I can correctly talk to it by asking the Model ID, (which returns 0xB4 correctly), but the RESULT_RANGE_STATUS register (0x4D) always returns 0x19 (0b00011001) which according to the VL6180 datasheet means that it has a VCSEL continuity error (bits 7:4 or 0b0001).  I have gotten this from multiple different VL6180 sensors now, so I'm not sure what is going on. In addition, the SYSTEM_FRESH_OUT_OF_RESET (0x16) register is always returning 0, even after rebooting the system.Does anyone have any ideas as to what I can do to diagnose the problem, or is anyone else experiencing this problem? 

Posted on November 30, 2015 at 10:39hi, can someone tell me how to configure the external clock on inemo?i can see there is an oscillator on inemo, so how can i use it? thanks

Posted on November 24, 2015 at 12:17Hi, i'm trying to develop a simple application with steval-mki121v1 , the inemo board. I just want to acquire data and blink a led using a GPIO, fixed a threshold.Can someone tell me if there is a guide to begin to develop my own application with inemo that explain me how to program it? there is something of ''already done'' that i can use to start? and what are the ide i can use?thanks

Posted on August 13, 2015 at 22:22Didn't see a way to delete this post, so just overwriting it...Finally got the LSM6DS3 to work over SPI. Was just some loose connections that didn't seem to bother any signal except the chip's SDO, which is still so touchy it won't work when I touch the scope probe to it. Anyway I hope that issue will go away when things are soldered down.

Posted on November 20, 2015 at 19:23I see that lsm303d has an application of impact recognition. How can this be known? What sensors or what registers would be triggered on an impact that we can get to know?

Posted on November 18, 2015 at 10:23Do it need multilayer for mp34dt04 layout?Can you give me some reference?

Posted on November 17, 2015 at 19:33Is it possible to somehow power up only a single gyro rather than all 3? I only need the gyro on one axis to detect the motions I'm looking for, and I could really use the power savings.

Posted on November 07, 2015 at 16:45 Hi guys, I am trying to read a sensor that is rotating, then record all the values through the ADC and I want the sensor to stop rotatin when it found the hishest value. Do you guys have any idea how to do that ? Below is the code that I have written so far. The sensor is rotating on a motor and I want it to stop once it read the hisgest value. #include < stm32f4xx.h > #include ''lcd.h'' #include ''pwm.h'' unsigned int my_array[1000]; //////// LCD DECIMAL VALUE DISPLAY //////////////////////// void lcd_num (unsigned long int t) { // variables float a=0; float b=0; float c=0; float d=0; unsigned long int Z=((t*3000)/4095); // output 1st value a=Z/1000 ; LCD_DATA(l+48,TXT); LCD_DATA('.',TXT); //output 2nd value b=(Z/100)%10; LCD_DATA(i+48,TXT); // output 3rd value c= (Z/10)%10; LCD_DATA(48+n,TXT); // output 4th value d= Z%10; LCD_DATA(48+d,TXT); LCD_DATA('V',TXT)

Posted on June 12, 2015 at 22:27Hi all,I am trying to use my LIS3DH in FIFO Stream mode.I am trying to configure the accelerator to generate an interrupt whenever the FIFO is full.However it never generates any interrupts.I have configured the registers as following:CTR_REG1= 0x57CTR_REG2=0x00CTR_REG3=0x02CTR_REG4=0x08CTR_REG5=0x48FIFO_CTR_REG=80I have noticed that when I read FIFO_SRC_REG for debugging the value is 0x20 which means that the FIFO is empty. Also when I read the value of FIFO_CTR_REG the value is 0x00!any idea?Regards,Peyman #lis3dh-fifo #lis3dh #lis3dh-interrupt