This code was created in 2001-2004 ... 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.

it instructs the microcontroller to run the code that’s already stored inside. Original Circuit Diagram: Arduino UNO R3 Now, have a look at our favorite Arduino UNO to find out the AVR chip inside. It ...

Here is a useful circuit for Arduino lovers and experimenters ... The voltage divider decreases the voltage being measured to within the range of the Arduino analog inputs. Code in the Arduino sketch ...