I know. It was difficult for me to let go of the idea. Keeping it simple was the hard part: everyone wanted to upgrade the basic control to tailor it to their personal site. I stuck with an Arduino uno and a little LCD screen with up, down, right, left and enter buttons. Had it working with either 10k ntc thermistors or one wire sensors. That was when I settled on the Trane defrost algorithm for air source outdoor unit control.
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