A buddy of mine and I would sometimes kick back and watch the TV at work. Unfortunately, we never knew someone was coming down the hall until they popped into the switchroom. We found an old motion sensor that had been a part of the security system at one time and when activated, it would apply 15-18V DC to a set of leads. We ran a cable from the sensor over to a PC that hadn't been used in years. I aquired a relay which had been controlling the AC compressor in someone's vehicle who also worked there (they didn't start having AC problems until the next spring...that they noticed). We wired the relay up to the sensor and the switched-contacts the the comm port (TX->RX) of the PC. I hammered out a really short and inefficient perl script that constantly wrote data to the comm port and when the motion sensor was activated, the relay looped my TX and RX on the PC, perl began receiving data and played a nice warning tone which was plenty of notice to "look busy". We also put Mahjonng on that machine and it became our gaming system for those slow days. I even caught the boss playing it a couple of times and I knew at that time, the machines future was secured. I love Perl.
-Jasper

In reply to Security Alarm by Jasper66

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