This user joined on 06/20/2015.
This is a binary clock with just four dots of light. No special timekeeping chip, either. Just one busy little ATtiny45 working its little heart out. Auto-dimming, and 3D printed case. See http://www.zl2pd.com/FourDotClock.html
Well, if you build a soldering iron controller, you've gotta clean the tips regularly! Supermarkets and a 3D printer to the rescue. See: http://www.zl2pd.com/bitcleaner.html
Three different approaches to soldering iron controllers culminating in a compact little controller in a 3D printed enclosure with excellent performance using an ATtiny25 and very little else. See: http://www.zl2pd.com/SolderingStation.html