LaserTripwire
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Liquidware team crafts laser tripwire that tweets intruder alerts, keeps fake sharks at bay (video)
Laser tripwire security systems can be expensive propositions that don't always work as planned -- just ask Raytheon, which saw its $100 million Perimeter Intrusion Detection System for JFK International Airport undermined by one wayward jet skier. Taking that as a form of dare, Justin Huynh and teammates at Liquidware have devised a much cheaper (if also much smaller) tripwire of their own. Any interruption of a laser pointer's beam is caught by an Arduino light sensor that promptly sends the alert to an Android-running BeagleBoard xM; if a toy like Bruce the shark dares cross the line, the BeagleBoard sends a Twitter message to let the authorities, or at least Huynh, clamp down on the trespasser. The invention won't replace Raytheon's handiwork anytime soon, although Huynh notes that additional or more powerful sensors could theoretically catch real, muscle-bound sharks and not just their plastic counterparts. The supply checklist and source code are waiting on the company's project page below, so those who'd like to ward off miniature invasions can get started today.
Laser tripwire does Hollywood-style security on the cheap, precious jewels not included
Sure, you could opt for a laser tripwire that puts intruders on blast via Twitter, but there's something to be said for the simplicity of the latest security system to come from Instructables user EngineeringShock. You've seen this setup before: a group of mirrors are strategically positioned to bounce a laser beam across an open space, ensuring that even the most nimble of invaders -- excepting MacGyver, perhaps -- will set sirens blaring. Consisting of a programmable keypad, a laser and detector, a series of six carefully aligned mirrors, and an LED-equipped siren, the system does Hollywood-style security on a budget -- the siren being the most expensive element at $20. If you're looking to lock your stuff down like they do in the movies, follow the source link for full instructions, or check out the video demo after the break.
Twittering Arduino-powered laser tripwire captures trespassers -- digitally (video)
Spare a thought for the modern thief. They have to face off against phones that can broadcast their location, laptops that lock themselves down, a LoJack service for iPods, and now a laser tripwire that can twitter pictures of unwanted visitors. It's a decidedly DIY Arduino-based project, but unlike many similarly powered offerings that we hit, this one is described as being very easy -- as far as Arduino-based projects go, anyway. Check out the instructions at the read link, or just enjoy the little demo video after the break if you're feeling lazy.
