yes thats was the problem, Actually my sensor specs do
not go higher then 3.6, oddly enough I calculated
4.98.
I changed the ADCON1 to have a reference voltage of 4
volt and implemented it. it now goes up to 1008, which
is better.

thanks for all the help

k


--- Jinx <joecolquitt@clear.net.nz> wrote:

> 
> > 807. this is equivalent to a voltage of 3.7, and
> the
> > Vdd is at 5 volt so as the maximum input analog
> > voltage. why doesn,t  it go higher then 807
> 
> Ken,
> 
> 807/1023 * 5 = 3.94
> 
> What source impedance and what acquisition time ?
> 
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