I have been tinkering with electronics ever since I got my first Weller in a dumpster of a hardware company going out of business as a kid. I still feel like a hobbyist with electronics and every hardware project has been a great opportunity to learn something new.
My favorite projects are the Thunderpack development boards that I was selling on Tindie and once I manufactured a full-scale touch-sensitive interactive dance floor.
Everything I do, I try to do open source.