Tracking Signups with Woot Lights | Loggly

Tracking Signups with Woot Lights | Loggly: "The ground wire and and the trigger pin (port 13) are at the top, but covered up in the diagram above. You’ll need a PNP transistor, readily available from Radio Shack, or Fry’s. You can also order them on Sparkfun, where you can get an Arduino if you don’t have one already."