Gary Preston has developed the Astro Cat which:

is an auto GPIO configuring add-on board for the Raspberry PI 3 which provides additional hardware interfaces to communicate with and control a Meade Autostar, Moonlite focuser and temperature sensors.

Or, to the layman, it helps you to control your telescope and monitor the environment around it. He’s documented the process he took to develop the add-on board and open-sourced everything so, if you’d like to, you can reproduce his work. Follow his guide here.

Most interesting to me is that he’s documented the process for disabling the Pi’s Bluetooth functionality to re-activate UART on the default pins. You can find out how to do that on this part of his blog guide.