For my final project for my Physical Computing class, I built a magnetic swipe gumball machine. In order to receive a gumball, you need to swipe a magnetic stripe card (i.e. a credit card, subway card, student ID, etc.). The idea is that you’re buying a gumball without knowing what it’s going to cost you (personal information? money? a subway ride?). If you’re interested in learning about what went in to building this thing, you can read this detailed post over at my old ITP blog.
