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 ...

Circuit Diagram: A schematic diagram showcasing the connections between Arduino, LCD, buttons, resistors, and LEDs is included in the repository (file name: circuit.jpg or similar). Code: The Arduino ...

Arduino Soil Moisture Sensor Circuit – Connection Diagram. Now that we have a complete understanding of how a Soil Moisture sensor works, we can connect all the required wires to the Arduino UNO board ...