While we wouldn’t want to document a computer motherboard with ASCII schematics, it’s great for a quick-and-dirty circuit diagrams. Not exactly schematics, but [Duckman] has some Arduino ...

An Arduino is a microcontroller — a single board ... to read your fingerprint and a list of other connectors to link the circuit to your lock. It essentially creates a magnet that only moves ...

This is a wiring diagram that [Soranne] put together when developing a method of programming PIC microcontrollers using an Arduino board. You can see that he takes care of the 12V issue by ...