Glossary

Key Points

Introduction	Raspberry Pi supports many means of connecting to other devices. The GPIO offers digital pins that can be configured for many purposes. The Raspberry Pi does not have analog pins like an Arduino.
Permissions	First key point. Brief Answer to questions. (FIXME)
Pinout	There are 2 separate schemes, BOARD and GBM, for referring to the pins.
GPIO via Bash	GPIO elements appear in the Raspberry Pi file-system and can be easily inspected/modified.
Using GPIO Pins for Input	The GPIO only has digital pins.
Using GPIO Pins for Output	You can signal with digital pins. Don’t try to power things with digital pins.
GPIO for serial connections

FIXME