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    BMA 456 being crazy when is vibrating

    Velth
    Member

    BMA 456 being crazy when is vibrating

    Hi how are you ? I using the bma456 / bma-456 , to get the acceleration and calculate roll and pitch angles, is working fine now 0° is 0.3°// 8° is 7.7°, but the problem is when I put under a vibrator table in 0° is getting crazy the values goes to 9°/22°/16° etc, some coworkers said that i would need to use fourier to clean my signal.
    But I'm not sure how I will do that. I want to know if theres something I cand do in the configuration of the bma-456, or some of you have another idea to clean my signal, i configured the filters in register acc_config 0x40, but doesn't change much
    3 REPLIES 3
    BSTRobin
    Community Moderator

    Re: BMA 456 being crazy when is vibrating

    Hello Velth,

    Do you mean you only use accelerometer and calculate roll and pitch angles?

    Velth
    Member

    Re: BMA 456 being crazy when is vibrating

    Hi BST, yes  I using the bma456  to get the acceleration   in register 0x12, then I use the formula below to get the angles 

    roll = atan2(acc_y, acc_z) * 57.3
    pitch = atan2((-acc_x), sqrt(acc_y * acc_y + acc_z * acc_z)) * 57.3
     
    it's working fine the problem is when I put the sensor in some vibration system, like a table or a car (which is my goal) 
    I using the sensor to see the inclination in trucks, but with the vibration of the motor, the sensor is getting crazy all angles are being randons 
    BSTRobin
    Community Moderator

    Re: BMA 456 being crazy when is vibrating

    Hello Velth,

    You need to use gyroscope with acceleration to calculate pitch and roll.

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