Glamorous days

Hello all,

 

I am currently trying to use accelerometer for trakcing the walking status of person.

According to xbow application, I already burnt the required code for accelerometer and able to get the X and Y data from sensor.

But I understand that this data is directly from ADC and I still need to convert to respective engineering unit.

 

When I checked out at "xconvert.c" file, I saw the following conversion. 

But it only describes about to convert to X value like this. Is this the code can apply to conversion of Y value?

===========================

float xconvert_accel(uint16_t accel_raw) 

{

    uint16_t AccelData;

    uint16_t calib_neg_1g = 400;       

    uint16_t calib_pos_1g = 500;

    float scale_factor;

    float reading;

    AccelData = accel_raw;

    scale_factor =  ( calib_pos_1g - calib_neg_1g ) / 2;

    reading =   1.0 - (calib_pos_1g - AccelData) / scale_factor;

    reading = reading * 1000.0;

    return reading;     

}

=============

Also in this code fraction, what is the meaning of 400 and 500 and how can I choose these values for other sensor? 

 

Thanks you so much for your help.

 

Regards,

 

Aung Aung