Bosch Sensortec Community

    cancel
    Showing results for 
    Search instead for 
    Did you mean: 

    Raw data of 2 BMI160 Accelerometer are not same

    Raw data of 2 BMI160 Accelerometer are not same

    Akshay
    New Poster

    Hello,

     

    Our requirement is to get same/similar raw data (Accelerometer adn gyroscope) from 2 BMI160 with different controllers. We are comparing 2 BMI160 sensor data from two different boards. Although the boards uses different MCU, we have made sure that the hardware placement/axis of sensor and sensor configuration are same.

     

    Details of Sensor configuration:

    _bmi160_sensor.accel_cfg.odr = BMI160_ACCEL_ODR_100HZ;
    _bmi160_sensor.accel_cfg.range = BMI160_ACCEL_RANGE_16G;
    _bmi160_sensor.accel_cfg.bw = BMI160_ACCEL_BW_NORMAL_AVG4;

    _bmi160_sensor.accel_cfg.power = BMI160_POWER_LOWPOWER;

    _bmi160_sensor.gyro_cfg.odr = BMI160_GYRO_ODR_100HZ;
    _bmi160_sensor.gyro_cfg.range = BMI160_GYRO_RANGE_2000_DPS;
    _bmi160_sensor.gyro_cfg.bw = BMI160_GYRO_BW_NORMAL_MODE;

    _bmi160_sensor.gyro_cfg.power = BMI160_GYRO_NORMAL_MODE;
     

    Test setup and Observation:

    Both the sensor boards and placed in same axis and moved in same pattern. The raw data from sensors are captured through UART terminal.

    We have observed that the gyrocscope raw data from both the sensors are similar(With minor difference). However, the accelerometer data varies by huge margin, depending on pattern/motion. 

     

    Attaching Accelerometer data from both the sensors for reference.BMI160_Comparison.JPG

     

    Looking forward for your support

     

    3 REPLIES 3

    BSTRobin
    Community Moderator
    Community Moderator

    Hi Akshay,

    For your test "Both the sensor boards and placed in same axis and moved in same pattern. ", could you take a clear picture show how you place the two sensor boards? And how you move them?

    Hi BSTRobin,

     

    Thank you for your response.

    The sensor placements on 2 boards are verified in gerber files with respect to orientation. They are placed at exact same locations on 2 boards.

    Attaching photo of our test setup. Two boards (with white enclosures) are mounted to same body. We are moving the whole body(black enclosure) in one direction and plotting the raw value of resultant/magnitude of all 3 axis.BMI160_TestSetup1.jpegBMI160_TestSetup2.jpegBMI160_TestSetup3.jpeg

     

    BSTRobin
    Community Moderator
    Community Moderator

    Hi Akshay,

    From your picture, the two accel rotate 90 degrees around the human face. The rotation radius of the two accel is different, but the time is the same, so the value of the accel value is different.

    Icon--AD-black-48x48Icon--address-consumer-data-black-48x48Icon--appointment-black-48x48Icon--back-left-black-48x48Icon--calendar-black-48x48Icon--center-alignedIcon--Checkbox-checkIcon--clock-black-48x48Icon--close-black-48x48Icon--compare-black-48x48Icon--confirmation-black-48x48Icon--dealer-details-black-48x48Icon--delete-black-48x48Icon--delivery-black-48x48Icon--down-black-48x48Icon--download-black-48x48Ic-OverlayAlertIcon--externallink-black-48x48Icon-Filledforward-right_adjustedIcon--grid-view-black-48x48IC_gd_Check-Circle170821_Icons_Community170823_Bosch_Icons170823_Bosch_Icons170821_Icons_CommunityIC-logout170821_Icons_Community170825_Bosch_Icons170821_Icons_CommunityIC-shopping-cart2170821_Icons_CommunityIC-upIC_UserIcon--imageIcon--info-i-black-48x48Icon--left-alignedIcon--Less-minimize-black-48x48Icon-FilledIcon--List-Check-grennIcon--List-Check-blackIcon--List-Cross-blackIcon--list-view-mobile-black-48x48Icon--list-view-black-48x48Icon--More-Maximize-black-48x48Icon--my-product-black-48x48Icon--newsletter-black-48x48Icon--payment-black-48x48Icon--print-black-48x48Icon--promotion-black-48x48Icon--registration-black-48x48Icon--Reset-black-48x48Icon--right-alignedshare-circle1Icon--share-black-48x48Icon--shopping-bag-black-48x48Icon-shopping-cartIcon--start-play-black-48x48Icon--store-locator-black-48x48Ic-OverlayAlertIcon--summary-black-48x48tumblrIcon-FilledvineIc-OverlayAlertwhishlist