Has anyone implemented a Sigma Delta converter in software, whether
with a PIC or otherwise.
I haven't but I am probably about to.

For those who haven't met them, in their simplest form a sigma-delta
converter is an integrator followed by a comparator (effectively a 1
bit A2D) which tracks the signal. The mean output (digital) signal is
the input signal. This can be measured by averaging o=r by using a
digital filter. Essentially any desired sensible level of accuracy
can be achieved given enough conversion time.




regards


        Russell McMahon