The Traffic Light Hack


The Disclaimer

First off, an obligatory disclaimer:

Hey, you! Listen up! Connecting your computer's parallel port to a circuit that has 125 volts of AC current running through it is a bad idea. If you accidentally cross wires fry your motherboard, it's not my fault. And don't run with scissors.
You could use a simple opto isolator for that purpose.
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May 2005  

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