>>> You should only need three sensors.
>>
>> Three may be conceptually OK if you are prepared to do calculations
>
> Which even a PIC 10F could handle easily.  This is a perfect example 
> of how
> a little bit of firmware cleverness can save real hardware cost and
> complexity.

I agree completely. And that's fine for you and me, or for that matter 
many people on this list, but there are still many people who are very 
capable indeed in their chosen fields who would consider rising to the 
challenge of a bit of analog electronics but who would never 
realistically venture into the " ... even a PIC10F ..." realm. Maybe 
"even a BASIC Stamp" would be acceptable to some such.



        Russell 

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