Circuit emulators are always a lot of fun. The (first I think) project in Coursera's Reactive Programming class had you play with a circuit simulator written i

Circuit emulators are always a lot of fun. The (first I think) project in Coursera's Reactive Programming class had you play with a circuit simulator written in Scala. It was an interesting assignment to work through. I think all you did was add a demux (the assignment focused on epidemiology iirc) but it would have been a great project to expand upon throughout the course. For example, using akka in the simulator to model different components interacting in a "clouduino. For those into building entire systems on top of circuits, btw, I can't recommend nand2tetris.org strongly enough.