Make a DIY Laser Tripwire Alarm For Just a Few Bucks http://ift.tt/1V4FPiR #geekporn
Being one of the most basic security systems, the #tripwire alarm is designed to be easily installed. The conventional trip wire security system consists of wire stretched across a path. Once someone trips over the wire, it triggers an alarm; a trap or so
from http://ift.tt/1WstTXp in Geek Porn
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