You have a point.
The number 15 was just a wild guess. So let me get back to the basics:
The high school here is very "exams oriented", so students may know how to answer math questions, and to install apps on their super-new smartphone, but most of them have no clue what's inside. On top of it, the apps generation have no idea that hardware can do also cool stuff, and simple software can control that.
I would like to build a course, at first for the top students, that will give them a touch to the embedded boards basics, and to software basics. later on (2-3 years from now), I hope to make it wider with basic/advanced/gurus courses.
So I would appreciate the ideas about what to build, what teaching material can I take, and share/cooperate with others that did/want to do the same.
The ideal application should be a teaser. If succeeded (i.e. in the eyes of the school management) I will have no problem to get attention & budgets to make it wider. So it needs to be "cool" that can be also presented at end of year events, and perhaps even making it a "geek Olympics".
I strongly believe that any science oriented high school student should be exposed to basic HW, SW and integration , before they go to university.