Fridge and Freezer Temperature Monitoring

A couple of weeks ago I had the unfortunate problem of my freezer’s auto-defrost not kicking on an the coils freezing completely. This led to my fridge not cooling down past 60. I had to take apart my freezer for the first time to de-ice the coils to get it working again. Then I got the bright idea of using some of the spare temperature probes I have and a spare Pi to monitor temperature. So I wired up a Pi and created a dashboard for monitoring temperatures in Grafana out of a postgres database.

Wiring was really simple, I just followed this guide to wire multiple probes up:

Code looks like this:

A couple of minutes in grafana and I get some cool graphs like this: