I was using Yakindu Statecharts at work and decided to run a workshop introducing other engineers to the tool. To get people more excited about building statecharts I designed a little maker project as homework to use as the target platform for the workshop. It's built around the D21 mini breakout from SparkFun and an IMU breakout. We built a statechart that, when armed, would flash the LEDs in an angry pattern if disturbed. Pretty useless but it was designed to exercise specific statechart features. It also ended being a Jenga-like game (e.g. can you take a pencil out from under the board without setting off the alarm?).