Cash rules everything around me. C.R.E.A.M. Get the money. Arduinos are showing up everywhere. Even in space. But what about the lowly tip jar? No. Are Arduino projects giving the Wu-Tang Clan the proper respect they deserve? Not even close! Rectification. That's what this is about. Interactive tipping. Dolla dolla bill y'all. Step 1: Materials Here's what you need. Materials: Can - My can used to hold bean ...