What projects would you think would interest my daughters the most? The oldest is 11 years, super creative and builds the most intricate stuff out of plain paper, tape and cardboard. I have learned programming from about her age, but feel like software would not catch her attention the same way hardware would. They already experiment with programming and microbits in school (what a truly lucky generation!!!).

I am looking for stuff that is not too complicated/expensive that it will just collect dust on a shelf because it took a lot of time to build. Specifically I would like to try something that could be dismantled and reused for other projects. Maybe a barcode scanner or something that has a connection with real life applications.