I have to do a project for school that involves electronics. The project will then be presented at the end of each school juris. But I do not know what to do!
Accepted suggestions but the project can not be too complicated to do. 
Tanks...
Define the scope of the project (budget, time frame, complexity, requirements etc)
If you look at the project guidance page here than you will see dozens of questions per day of people who know what project they want to do but not know how. Reading them will inspire you to make a fun choice.