from the friday-night-build-your-own-series-continues dept.
edBX writes "GideonTech.com has a new guide up on how to make your own electronic lock using a key card. Built using a phototransistor, infrared-emitting diode and a few ICs, they are able to turn on their computer using a punched out phone card."
Dynamically binding, you realize the magic.
Statically binding, you see only the hierarchy.