On Tuesday 04 February 2003 06:37 am, you wrote:
> You havn't thought of trying this using an external
> "true" rail-to-rail opamp as comparator ?

As this is more for learning than anything else, I would like to try=20
that.  Do you have any recommendations for an easy to obtain part?

> Perhaps not what you would like to use, but it would
> be nice to see it you'd get a full 0-5 V range that
> way.

It would be nice to have a full 5.0V range, but I'm willing to live with=20
the reduced range by "surrounding" the pot with resistors and=20
compensating in software.  At this point, it is more of a mystery that=20
I simply can't resist investigating and attempting to understand.  All=20
I want is a good explanation for not being able to use it near ground. =20

Could it be that there is some type of input protection diode causing a=20
voltage drop on the input pin?

Thank you for your help.  ;-)

michael

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body