[Tinyos-help] Conversion formula of Accelerometer value.

[André Miguel de Almeida Marrão Rodrigues]

Hi

In the accelorometer datasheet you  you see a  range of -1.5 g to 1.5g
so it's a 3g absolute range. On the other hand the adc should return an unsigned value bettween 0 and 4095.
That explains the formula.

I don't use voltage reference so in my cause the voltage is VCC for the adc and for the accelorometer.

And this is general translation code for linear sensors

André

PS: Would shoul post this kind of questions to the forum for multiple resons.
 


  hi Andre

  As you send me the formula like value read / 4095 * 3 - 1.5,  my  question is that  3  -  1.5 is it  the range of refference  voltage or siply 3 minus 1.5. like in case of acc we r taking 2.4 v as reference so in that case is it value read / 4095 * 2.4

  And one thing more, is this formula common for converting all channel value. coz I just want to work with accelerometer. 

  I will be thanks full to you if you reply as soon as possible

  regards 

  Motalib 


  On 12/13/07, Motalib Rimon <motalib.rimon at gmail.com> wrote:
    Hi 

    the formula that u give is like that 


    (Value read/4096*3)-1.5 


    is it correct
         

-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.millennium.berkeley.edu/pipermail/tinyos-help/attachments/20071218/89ed94ad/attachment.html