So, a couple of months ago, I've made a library that includes schematic symbols for Arduino Nano and Arduino Uno boards. They are also available as individual libraries.

Learn how to choose the best symbols and conventions for your schematic diagrams. Follow these tips to create clear, consistent, and accurate schematic diagrams for your circuit or system.

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 ...

Electronic Products Analyzes The Top 10 Most Common Electrical Symbols Found On Basic Schematic Diagrams. Visit To Learn More.

Arduino-UNO-PCB-Design This repository contains full PCB design of Arduino UNO. This design was done completely from scrath, starting with selecting components from digikey, creating schematic symbols ...

Figure 7: Schematic diagram of the automatic hand sanitizer dispenser (Second Design) According to the LM393 datasheet: “The LM393 series are dual independent precision voltage comparators capable of ...

QElectroTech is an open source tool for drawing these types of diagrams. It consists of two tools: an element editor for creating schematic symbols and a diagram editor for creating your drawings.