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Interesting - and thanks Rob and Luka for taking it further. The Temperhum I ordered (around AU$30) says it's +-0.5deg C accuracy on the PCSensor website, but on the Alibaba page I bought it from says it's +-0.2deg. Not sure I trust either of those...
Wondering accuracy of this arduino solution.
Regarding the use of leads for the Temperhum - mine would be connected to Mount Hub Pro which sits on the scope. Not sure how much heat the MHP generates, but I was assuming that'd be realistic enough to ambient, or at least follow the trend. Only interested in temperature drops, not necessarily the absolute value, to trigger autofocus adjust.
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