More software tweaks
Bread board testing last night - it works. A few refinements to the code. Manual maximum temperature selection is hard coded to 15C. Seems pointless cooling and providing selections that in practice would never be used.
Retained the LED for indications, just in case the OLED packs in.
A few tweaks to the board and it will be ready to go. All up, smaller than the breadboard in the previous post, it should fit nicely out of the way.
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