Serial input to select sensor profile

[pyr0ball]

Conceptual feature enhancement:

User can send a command over serial to have the AVR self-configure for a specific kind of piezo sensor, alter voltage range thresholds, etc.

Needs:

• Acceptable voltage ranges for specific piezo sensors
• Suggested models / BOM
• Compatibility request list

[pyr0ball]

Commit https://github.com/pyr0ball/pyr0piezo/commit/118e8cf7e0f64ea669cd7298c0c62c95fe758189 opens up enough pins to create a serial communication channel back to control board

[pyr0ball]

Tutorial on serial input basics

[pyr0ball]

Serial Input has been established, some changes may be required in future but another issue can be opened for those