I am planning of using an Arduino to control the internal temperature of a freezer.
Since I don't want to modify the freezer, I will take the approach of switching its mains supply ON/OFF through a SSR. This has already worked well enough with an off-the-shelf temperature controller, so I am not expecting major problems.
Two questions, though:
Will I need a snubber circuit to protect the SSR? I don't think so, since I will not be driving the compressor directly, but I'm far from being an expert in electronics, so I'm not sure.
I was originally planning of writing the controlling algorithm myself, but then I found out about the PID library: would you recommend its use?