While we wouldn’t want to document a computer motherboard with ASCII schematics, it’s great for a quick-and-dirty circuit diagrams. Not exactly schematics, but [Duckman] has some Arduino ...

Block diagrams can be written ... process and output could be. Producing a schematic drawing on a computer is far neater than drawing it by hand, with computer programs available to quickly ...

are clear, simple diagrams showing all of the input, process and output elements that make up the system being designed. They are easy to read and show how the circuit will work. Circuit diagrams ...