Original Circuit Diagram: Arduino UNO R3 Now, have a look at our favorite Arduino UNO ... You can find numerous ideas, tips and tricks everywhere in internet. Next is the complete schematic diagram of ...

it’s great for a quick-and-dirty circuit diagrams. Not exactly schematics, but [Duckman] has some Arduino pinout diagrams he made using ASCII-art. These could be useful when pasted into source ...

Luckily, requisite googling found a “multifunction shield” for the Arduino Uno platform available ... Here is a circuit diagram of the multifunction shield adopted from the web (updated a bit by me).