Raspberry Pi Electrical Setup

[modelmat]

There is currently no information about how to physically connect and set up a raspberry pi (or other coprocessors) connected to the robot.
Details on:

• What is needed to connect it up
• How wiring should be done
  etc should be added.

[Starlight220]

networking an RPi should also be added

[drewwhis]

Might also need to address differences in connections and power requirements of Pi 3 vs. Pi 4.