These days, almost any significant electronic project will use a CPU somewhere ... is you can have the circuit simulator on the left of the screen and a Web-based Arduino IDE on the right side.

However, as you get comfortable with using Arduino ... free to open their circuit, see the sketch used, and run the simulation to understand how their system works (some projects already come ...

as does the project’s FAQ page. If you’re new to the world of circuit simulation, we went over the basics of using SPICE in a recent Hack Chat.

If you want to toy around with exactly how circuits would work, Lushprojects has a little web app for just that. This project’s ... walks you through the basics of using it.