Don't load REF pin of MAX1968 chip on HWRevs < 3.0 #103
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The REF pin of the MAX1968 TEC chip on hardware revisions v2.x is missing a buffer, loading the pin on every CPU ADC read. Avoid reading from it and leave the pin floating on affected hardware revisions, and return the nominal 1.5V instead.
Workaround of https://github.com/sinara-hw/Thermostat/issues/117.