Teaching with just a single Makey Makey and Sphero Last summer I was excited to get my hands on a Makey Makey. I played around with it for a couple days, but it ended up just gathering dust for most of the year. The same goes for a Sphero SPRK.

They were fun to play around with, but they weren't overtly connected to what I was teaching, so I didn't prioritize finding creative ways to integrate them. However, I get the sense that there was some untapped instructional potential in these devices.

Are there lessons and demonstrations using only one Makey Makey or Sphero that can effectively illustrate CS concepts? Moreover, do they have a place in a CS class?

I'm looking mainly for short, self-contained lesson ideas since I only have one of each; a classroom set would necessitate a separate question.
I'm not sure what grade level you are teaching and what languages you are using in your classes, so I'll just give some general answers.

Since you have one Sphero, you might want to try something like CodeSnaps that would let paired students or even individual students create code for the Sphero using printed blocks. When the code is complete, one device and one Sphero could be used to test the code.

Makey Makeys are more for demonstration of circuits and electronics rather than CS concepts and having only one Makey Makey is very limiting. The CS concepts would be in whatever program the student created that will be controlled by the Makey Makey. One thing that you could do is to have students work on designing a controller for a game they have created. The controller would be hooked up to the Makey Makey once it and the game are complete. This would require that students understand the basics of creating a circuit in order to design their controllers and give them a payoff for creating a game that uses arrow keys and the space bar. If you don't want to get into the "making" part, then perhaps you could just use the Makey Makey hooked up to a presentation computer that students use to demonstrate games they have created. If you are interested in how other educators are using Makey Makeys, there are some great ideas in the Facebook Makey Makey Educators Group.