Two ways to use an LED as a light sensor with Arduino(blog.jgc.org)134 points by jgrahamc 2 years ago | 61 comments
Elektročas HH3 – the most accurate pendulum clock on the planet(dvaluch.web.cern.ch)86 points by tverbeure 1 year ago | 36 comments
The Mighty Big Array of Finn Jensen LA8YB(la0by.darc.de)28 points by kalehmann 3 months ago | 7 comments