Passcode protected laser tripwire alarm system
posted Mar 11th 2011 3:20pm by Mike Nathanfiled under: arduino hacks, laser hacks, security hacks
Sometimes security doesn’t need to be overly complex to be effective. Instructables user [1234itouch] recently built a simple laser tripwire alarm that can be mounted virtually anywhere, complete with a keypad for disarming the device.
He mounted a photo cell in a project box, along with an Arduino and a 12-button key pad. A laser pointer is aimed at the photo cell from across a gap, which results in a steady voltage being read by the Arduino. When the laser beam is broken, a drop in voltage is detected, and the alarm sounds until you enter the proper pre-configured passcode. Entering the passcode triggers a 15 second grace period during which the the alarm cannot be tripped again.
It might not be built with triple-thick steel doors and thermo-sensors, but it’s a simple device for simple needs. In its current form it could be pretty useful, and with a little reworking, there are a wide range of things it could be used for.
Continue reading to see a demo video of the tripwire alarm, and be sure to check out these other tripwire-based security systems.
Arduino laser detector with keypad
Video Link...
http://www.youtube.com/watch?v=vIzUUX8hrEI&feature=player_embedded
tagged: alarm, arduino, laser, security, tripwire
Go there...
http://hackaday.com/2011/03/11/passcode-protected-laser-tripwire-alarm-system/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+hackaday%2FLgoM+%28Hack+a+Day%29&utm_content=Google+Feedfetcher
- Passcode protected laser tripwire alarm system
- Passcode protected laser tripwire alarm system - Hack a Day
- Arduino laser detector with keypad
- Arduino security with frickin’ laser - Hack a Day
- YouTube - arduino laser detector with keypad
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