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Programmable microprocessors are another learning curve on top of electronics and a layer of complexity that is perhaps not necessary for a dew controller. It fits with my existing system which is built around the Arduino. Essentially, Nichrome works very well.
The Jaycar wire, at 0.33mm, has a resistance of 0.0138R/mm. Using Al's sheet I needed 18.4R for my lens diameter.
18.4 / 0.0138 = 1333mm - when complete R was actually 17.8R; that is, 18.3 - 0.5, the native resistance of the ohm meter.
Accurate measurement up to the solder points at each end of the wire and allowing for equipment tolerance seems to make quite a difference.
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