Students could research an existing project and attempt to recreate.
For example, what about the Clapper?
Students could develop a prototype of this device. They could take it further by using a controllable four outlet power relay to adjust the lights based on sound.
I love using the SCAMPER as a guidepost to help me consider whether a hands on learning component could help enhance the learning in a lesson or project.
Example of how you could use CP instead of Micro:bit for the Greek Myth project I developed for 4th graders.
Could you create something largescale for a class to create for an exhibition for the community?
The amazing Dori Friendman was making a yo yo out of CP. What could you create as a challenge for students to engineer a 3D Print element to be used with CP?