> This seems to be taking on a life of its own!
> 5 degrees is accurate enough for my needs.

If time response is not critical, and it may be, then yuou 
can smooth this as much as you need to make it stable 
against any sensible amount of random noise.

For faster response even a modest formally designed (as 
opposed to just a big RC) low pass filter (say 2 to 4 poles) 
will make a vast difference to the response time. A 4 pole 
LP filter can require as little as 2 transistors and some 
passives. You can get 3 with a single transistor if needs 
be.



            Russell






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