freezermon

By Scott Baker, https://medium.com/@smbaker

Monitor the temperature of your freezer with a raspberry pi and Prometheus/Grafana

why?

I've had my fridge and freezer go bad. It's not a pleasant experience. I wanted a simple temperature monitor that will report the temperatures to prometheus and grafana, where I can configure prometheus-alert-manager to generate alerts.

Hardware

You'll need:

• A raspberry pi. I suggest going with a raspberry pi zero 2 w.

• A DS18B20 temperature sensor. Search for "ds18b20 waterproof" on amazon to get some plausible options.

• A 4.7 K resistor. Approximate value is fine. It's just a pullup.

• A case for the raspberry pi, if you want to make it nice.

Wiring

• Connect the GND of the DS18B20 sensor to a GND on the pi.

• Connect the V+ of the DS18B20 sensor to +3.3V on the pi.

• Connect the data line of the DS18B20 to GPIO4 on the pi.

• Connect the 4.7K resistor from GPIO4 to +3.3V. (yes, we've already attached wires to GPIO4 and +3.3V)

Building

• You can make build and make install directly on the pi.

• ... or you can make release somewhere else, and copy the built binary to your pi.

See INSTALL.md for further instructions.