Windows: If you're looking for a quick and simple way to generate a flowchart, Diagram Designer is a free and lightweight tool for easy flowchart gene ...

It doesn’t specialize at any one type of diagram, but its rich library of glyphs and wide selection of starter templates make it easy to create almost any two-dimensional diagram.

Block diagrams 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.

It’s a pretty clever system with very simple and flexible circuitry. [0033mer] says he’s used this over twisted-pair wires a couple of hundred feet long, which is pretty impressive.