Reader Sebastian built a Pi-powered controller to monitor and even adjust the temperature accordingly.

Here’s how Sebastian describes it:

MashBerry is a Raspberry PI based beer-brewing controller.

It is designed to automate the mashing-process for the homebrewer.

MashBerry can be operated via a Web-interface or via a Display and an IR-remote.

The temperature is controlled using a PID-controller, the temperature-measurement is done with a PT1000 or a Dallas 18B20.

For power-control an external Solid-State-Relay is used.

The whole configuration (like entering recipes, PID-Autotuning, etc.)

is done via the built in Web-interface.