Option to install multiple cameras per Raspberry Pi

[joseph-reynolds]

This is a wish list item to be able to control multiple cameras per Raspberry Pi, for example, pointed in different directions and separated by several feet.

The current project is limited to a single Raspberry Pi camera per Raspberry Pi (RPI) (yes, two cameras for stereo vision) and cannot use USB cameras. The RPI camera was chosen for high resolution, simplicity of getting started, and its built-in motion detection capability.

This change likely means we need to support USB web cameras. For that we need to consider USB adapters, increased power requirements, image-based motion detection, and additional camera configuration. The RPI Zero can handle maybe data from two cameras. Consider using the Raspberry Pi model 3 for more processing power.