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Would you mind reviewing the diagram I made for the next hardware revision? The new items are:

Support for 3 stage cooling and 2 stage heating

A capacitor to smooth out the temperature sensor data

3 analog comparators to act as a backup safety system

My main concerns are:

There's a lot of crossing pathways here. Can this be simplified?

Do I have the correct resistor configuration to hit 45.8F (576mv) and 96.8F (854mv)?

I'm still worried about the heater rapidly toggling on/off between 45.8 and 45.9 degrees due to legitimate temperature changes. Is there a means to keep it on for x minutes or y degrees after it trips?

Thanks, Jeremy