MEMS (sensors)

Posted on July 03, 2016 at 14:04 Sample program to get accelerometer data. #include ''stm32f3xx.h'' // Device header void initSystem() { // LSM303DLHC wiring: SCL to PB6, SDA to PB7. // Enable port B timing and set pins to alternate function mode. No pull-up/pull-down. RCC->AHBENR |= RCC_AHBENR_GPIOBEN; GPIOB->MODER |= GPIO_MODER_MODER6_1|GPIO_MODER_MODER7_1; GPIOB->OTYPER |= GPIO_OTYPER_OT_6|GPIO_OTYPER_OT_7; GPIOB->PUPDR &= ~(GPIO_PUPDR_PUPDR6 | GPIO_PUPDR_PUPDR7 ); GPIOB->OSPEEDR |= GPIO_OSPEEDER_OSPEEDR6 |GPIO_OSPEEDER_OSPEEDR7; // Select AF4 (0100=0x4) to toggle I2C_SCL function on pin PB6 and I2C_SDA on pin PB7. GPIOB->AFR[0] |= (0x4 << GPIO_AFRL_AFRL6_Pos); GPIOB->AFR[0] |= (0x4 << GPIO_AFRL_AFRL7_Pos); // Enable I2C peripheral clock. RCC->APB1ENR |= RCC_APB1ENR_I2C1EN; // Set up TIMINGR (CubeMX). I2C1->TIMINGR = 0x00501E26; // Peripheral Enable. I2C1->CR1 |= I2C_CR1_PE; }

Posted on July 11, 2016 at 22:52Hi all, I've recently bought a couple of LSM9DS0's for a simple project. Before soldering them to my board I tried to checked if everything was right. I ONLY connected pin 5 and 6 to GND and 15, 16 and 17 to 3v3. However when I turned on the power supply, it showed up a short circuit. I was wondering if anyone has an idea on what is wrong. I don't think that I burnt them by static as I used them with a wrist band connected to GND. Besides, the cut-off current on the power supply is set to 200mA. I'm also attaching the design of the board I was planning to use with the IMU if anyone has an opinion about it. Best regards

Posted on May 04, 2016 at 16:07Hi to all, i have this shield x-nucleo-6180XA1 with mi STM32L152RE, i setting PB8 and PB9 for I2C1, i want to test the shild i want to see the who i am,  i write this easy code   &sharpdefine IDENTIFICATION__MODEL_ID  0x000   //who I am &sharpdefine PROXW  0x52 &sharpdefine PROXR  0x53 &sharpdefine DEFUALT_ADDR 0X29 void I2C_WHOAMI(I2C_HandleTypeDef *hi2c1, __IO uint8_t whoami){         while((hi2c1->Instance->SR2&BUSY)==BUSY);   //  Start     hi2c1->Instance->CR1 |= START;   while((hi2c1->Instance->SR1&SB)!=SB);   dummy16 = hi2c1->Instance->SR1;     hi2c1->Instance->DR = PROXW;   while((hi2c1->Instance->SR1&ADD

Posted on June 21, 2016 at 18:19The datasheet doesn't specify how to convert register (OUT_TEMP_L (0Ch), OUT_TEMP_H (0Dh) ) data to actual temperature. let's say for example if reg 0x0c = 0x7 value and reg 0x0d = 0x00 value, then what will be the temperature. #lis2dh #temperature #temperature-sensor

Posted on January 25, 2016 at 12:25Hi,I am trying to use multiple VL6180X sensors and attach them to a robotic arm. Is there the possibility of interference between them? If the answer is yes, is there any way to avoid it?ThanksMarina #multiple-vl6180x

Posted on July 10, 2016 at 20:53Hi I would like to get the signal strength very much.So, please let me ask two questions.The first one is about a function in vl6180x_api.c.julien@ST said like following in the Discussion Board named ''How to measure the ToF'':>No, there is no way to access to the time of flight. Only distance, signal strength, ambiance rate ...>Signal strength is the amount of the photons coming back from the target.>You can access to this field ''rtnRate'' in the struct ''VL6180x_RangeData_t'' below.So, I saw the _GetRateResult function in the vl6180x_api.c.However, I couldn't understand clearly following part:>        calcConvTime = m_refConvTime;>        if (m_rtnConvTime > m_refConvTime) {>            calcConvTime = m_rtnConvT

Posted on July 07, 2016 at 18:19 Hi, I faced with the problem of acceleration calculations on lsm303dlhc I read registers and past them, but in x, y, z variables contain crazy values, if demoboard is on the table, values must be x: 0, y: 0, z: 1000, but i get x: -1499 y : -1499 z:49 Range +-2g. Please, describe process of calculating acceleration in m/s^2 if i have values from registers int8_t buffer[6]; uint8_t aTxBuffer[8]; int16_t pnRawData[3]; while (1) { HAL_I2C_Mem_Read(&hi2c1, 0x32, 0x28 , 1, (uint8_t*)&aTxBuffer[0], 1, 1); HAL_I2C_Mem_Read(&hi2c1, 0x32, 0x29 , 1, (uint8_t*)&aTxBuffer[1], 1, 1); HAL_I2C_Mem_Read(&hi2c1, 0x32, 0x2A , 1, (uint8_t*)&aTxBuffer[2], 1, 1); HAL_I2C_Mem_Read(&hi2c1, 0x32, 0x2B , 1, (uint8_t*)&aTxBuffer[3], 1, 1); HAL_I2C_Mem_Read(&hi2c1, 0x32, 0x2C , 1, (uint8_t*)&aTxBuffer[4], 1, 1); HAL_I2C_Mem_Read(&hi2c1, 0x32, 0x2D , 1, (uint8_t*)&aTxBuffer[5], 1,

Posted on July 03, 2016 at 06:57 What is the maximum allowable voltage applied to the INT pins (assuming open drain)? Why are ST's datasheets usually incomplete? #h3lis200dl

Posted on July 07, 2016 at 11:19Hi everyone,I have tried to communicate with LPS22HB by I2C, and then I realized that the defaut value of CTRL_REG2 is 0x0, but the defaut value indicated in the datasheet is 0x00010000. Is there anyone has the same problem??Thank you,Dung. #lps22hb

Posted on July 04, 2016 at 08:11Dear ST engineer,I use LIS3DSH for digital angle meter development.But I have calibration error on LIS3DSH.I am study ST DT0053 6-point tumble sensor calibration.Could you give me a calculation example for the sensor calibration?The following information is read form LIS3DSH:[1g,  0g,  0g] = [17322, 1197, 217][-1g, 0g,  0g] = [-15315, 467, 300][0g,  1g,  0g] = [1362, 17266, 288][0g, -1g,  0g] = [719, -15656, 212][0g,  0g,  1g] = [1009, 894, 16636][0g,  0g, -1g] = [1177, 759, -15883]Thanks.Edison

Posted on June 16, 2016 at 13:24Hi,the self test procedure described in AN4602 starts automatically by setting bit 0 to '1' in CTRL_REG1 register, but it is not well explained how to check if the self test passes or fails.If the self test passes, the device performs the calibration by itself? #lis3mdl #selftest #lis3mdl #self-test #lis3mdl-temperature-calibration #calibration

Posted on June 23, 2016 at 23:53I have read over the user manual for the MEMs board, and I am using the example code from the DataLogFusion. However, I can never get the osx_MotionFX_compass_isCalibrated function to return true. I have tried hitting the reset button, moving the board clockwise in all three axis, moving it in a figure 8 and lots of different combinations. Anyone have an idea how to do this successfully or what may be the problem? Thanks!

Posted on January 28, 2016 at 13:10Dear All,I am using LSM330DLC gyro-acc on my board and I have forgotten place pull-up resistors on the SPI/I2C selection pins. However it works fine. My question is can I develop my project without these pull-up resistors?It is mentioned, in datasheet, these pins must be high for I2C operation, but in my case it is 0V and I2C works well.

Posted on June 06, 2016 at 03:14I'm using IIS2DH, I config it to normal mode, so It's 10bit resolution, and I got 16bit data for each axis, now I right shift the 16bit data to get a 10bit data, and the range is 0-1023, is that right? but And if I keep the board horizontal, I got the Z = 125*7.81mg/digit= 1g, it's right, but if I reverse the board, the ideal Z should be -g, right? But I got the data which is 905, so Z = 905*7.81mg/digit = 7g, it's not right, I can't find  details about how to convert data to g in the website, who can help me ? #data-convert #g #iis2dh

Posted on May 25, 2016 at 14:09Hello guys, I'm planing to use LIS3DHTR accelerometer in my next project. There is one thing (for the moment :-)) that is bothering me: The default state of the INT1 and INT2 pins is not explicitly indicated within a datasheet (at least I could not find it). I'm curious to know what is default state of the INT1/INT2 pins and what is the state of those pins when the interrupt occurs? Is this parameter (the state during the interrupt) configurable through I2C/SPI interface or there is just one default value? Thanks in advance for your time and effort. Sincerely, Bojan. #lis3dh #lis3dh-interrupt

Posted on May 25, 2016 at 18:57Hello everyone. This is my first posting on this forum. I am an electrical engineering major completing a senior design project. I am designing a smartwatch and I purchased the STEVAL MKI159V1 motion sensor and this will be my first time working with the Raspberry PI 3 microcomputer and my first time working with a motion sensor. My question is where can I find instructions on how to connect the STEVAL MKI159V1 that contains the LSM9DS1 to the Raspberry PI 3 via the I2C connection on the Raspberry PI 3.? This was not taught in my EE education and I want to make sure it is connected correctly. I plan on measuring the motion sensor data and eventually filtering out any noise. Thank you for any input you can give me. #mems

Posted on June 27, 2016 at 15:50Hi everyone,I'm working on LPS22HB and I use Sensor Controller Studio (a TI's tool).Do anyone in this forum used this Studio? We can exchange knowledge and experience. Best,Dung. #lps22hb #ccs #scs

Posted on June 23, 2016 at 05:04Is it possible to down scale the range by 2 to 50mm and output in 0.5mm increments represented as integers in a similar way upscaling works?

Posted on June 22, 2016 at 16:17 Hi guys, Sorry that I have a dumb question I am new to STM32's board, and we are currently using  F446 with MEMS microphone module. We want it act as a USB microphone like what it said.   http://www.st.com/content/ccc/resource/technical/document/user_manual/f5/06/94/40/a6/01/49/ae/DM00187405.pdf/files/DM00187405.pdf/jcr:content/translations/en.DM00187405.pdf We have our USB devices code ready but when we connected to PC it shows ''unknown devices''.. That means we have to search for some other driver at PC side or it means that our code is erroneous... Thanks for the reply BRs, Kevin

Posted on September 28, 2015 at 16:38Hello,I�m using an stm32f4-discovery board and I�m trying to sample the on board mems microphone at 48 kHz. I record a large number of samples and send them to the computer via USB (if someone knows a better way of doing this, help would be appreciated ) and analyze them on the PC. The problem is that I�m trying to use frequencies above 15 kHz and the power of the signal in that part of the spectrum is really small. Does someone knows about the frequency response of the mic on that range? Is it good enough or am I wasting my time?Thanks for the reply.Raul #usb-mic-stm32f4discovery #mp45dt02 #mems-microphone

Posted on January 12, 2016 at 15:16Hello, 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 June 18, 2016 at 00:39Hello all,I just followed the official documentation to enable 4 microphones and I can not see the nucleo board any more on my PC. Can you please advise? Did anybody have the same problem?I'm using the following kit: - NUCLEO F401RE - X-NUCLEO-CCA02M1 - STEVAL-MKI129V1 Table 3. Solder bridge configuration for four microphones SB Status SB7 Close SB8 Close SB9 Open SB10 Close SB11 Close SB12 Open SB13 Close SB14 Open SB15 Close SB16 Open SB17 Open SB18 Open SB19 Open

Posted on May 09, 2016 at 19:52My colleagues and I are evaluating the LPS25HB and came across some behavior we don't understand. There are two issues we are trying to resolve right now: Embedded temperature compensation behavior is confusing.Accuracy isn't what it should be.Specifics: In one of our datalogs (pressureLog_25Hz.xlsx) we see absolute pressure tracking with temperature. We expected temperature to change, but not absolute pressure. Absolute pressure is changing at a rate of about 3 hPa/C. Shouldn't the embedded temperature compensation deal with this?In a test we did in a car (car pressure log.xlsx), we saw temperature drop and then increase, but the pressure is almost constant if you draw a trend line through the data. It seems like embedded temperature compensation is doing something this time. We need help determining why is the sensor acting differently.

Posted on June 15, 2016 at 12:24There is a utility for MEMS data logging in the Nucleo Packages but is there any Utility for datalogging Other sensors like UV Sensors and Mems MicroPhone Sensors?Eagerly waiting to know on this? #mems-microphone-array #uv

Posted on June 05, 2016 at 03:20hi, I'm using the HTS221 humidity and temperature sensor along with the STM32F205. They are connected over the SPI bus but I am unable to get the STM32F205's SPI communications working correctly. Can anyone recommend some known to work sample code for this combination of devices?Thanks,Doug Burrell #hts221