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Contact sense in 24 Hours

Lots of quite expensive equipment used in telecommunications, television and security still use contact sens outputs for reporting error conditions.This project was put together in the space of 24 hours to allow Nagios to
monitor some contact closures.

This project was a rush: 24 hours and $100 of parts from whoo to go … an Arduino and a couple of libraries … to a successful hardware interface. It is an impressive testament to the ease of development on the Arduino platform.

http://www.castro.aus.net/~maurice/electronics/ArduinoContactSense/