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Hi Bob,
I was in the process of designing an Arduino-controlled dew heater when I came across your article. Thanks for sharing it - helpful doesn't come close!
I have a question about the temperature sensors. From the photos of the finder scope looks like you slip these under the sleeves containing the heater elements, however I'm worried that if I do that the readings will be artificially high - especially when switching the heaters on for the first time on a cold scope (when the heating element will be hot but won't have had time to warm the scope). Have you noticed this at all in practice?
For an eyepiece/diagonal there isn't much scope to move the sensor away from heating element, so I had wondered about switching the heater off for say 30 seconds just before taking each temperature reading to allow the temperatures to equalise and only adjusting the PWM every couple of minutes (perhaps with a longer initial 'burn time' when the controller detects that the scope is well under the dew point).
Does this sound useful, or am I over complicating things?
Thanks again for sharing your excellent materials!
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