Multipurpose PID controller

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Often I find myself needing more procedural control over heat treatment. The two specific use cases I have right now are 1) Controlling my kiln to heat treat metal and 2) Controlling my reflow oven. Both of these uses require multiple heat/cool cycles for with differing time lengths. Rather than control them manually, I build a PID controller box. I will update this post to include a BOM at a later date. For now, take a look at the test run:

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