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    BMX055 fast compensation accelerometer

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    BMX055 fast compensation accelerometer

    Dear all,

    I am using a BMX055 and I would like to know how can I convert the fast compensated accelerometer values into g's?
    The fast compensation values of the accelerometer are signed 8-bits integers.

    "int8_t compx = readByte(BMX055_ACC_ADDRESS, BMX055_ACC_OFC_OFFSET_X);
    int8_t compy = readByte(BMX055_ACC_ADDRESS, BMX055_ACC_OFC_OFFSET_Y);
    int8_t compz = readByte(BMX055_ACC_ADDRESS, BMX055_ACC_OFC_OFFSET_Z);"

    So, how do I convert 8 bit raw ADC values into g's?

    Thanks in advance once again!

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    1 REPLY 1
    Community Moderator

    Re: BMX055 fast compensation accelerometer

    According to BMX055's datasheet, the register description of ACC Register 0x38 OFC_OFFSET_X (respectively 0x39 and 0x3A for Y and Z axes) mentions:


    the offset value is represented with two’s complement notation, with a mapping of +127+0.992g, 00g, and -128-1g.

    Therefore you would need to divide your signed 8-bits integers by 128 in order to convert accelerometer offsets from LSB to g (regardless of the selected g-range).

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