Not exactly schematics, but [Duckman] has some Arduino pinout diagrams he made using ASCII-art. These could be useful when pasted into source code as comments, documenting the pinouts for your ...

Sometimes, you'll also encounter Arduino tutorials in the wild that include links to a Wokwi circuit as creators and developers typically create one to show the project's schematic diagram. Other ...

This includes popular development boards such as the Arduino UNO, Arduino Nano, Seeed Studio XIAO ESP32C3, ... Circuit Canvas plans to link standard schematics and illustrated diagrams together.

Somebody on Facebook recently asked about finding an easy-to-use shield helpful for experimenting with Arduino wherein he wants to try a single one instead of a number of luxurious shields. Luckily, ...