Laser Tripwire Alarm — DIY Hacks and How Tos
Have you ever wondered how safe it’ll be if you could install a laser security system in your home? Well, good news, you don’t need to spend a fortune to get one installed. The following project will actually make it possible for you to make your own laser tripwire alarm that’s works just as good as those top-of-the-line laser security systems. Many thanks to the author ‘DIY Hacks and How Tos’ @ instructables.com.
No security system is complete without lasers. So in this project I am going to show you how to build a laser tripwire alarm from a laser point, a couple of mirrors, and a few dollars of electrical parts. With this you can cover an entire house with an array of light beams. If any one of them is crossed it sets off your alarm. It can be a standalone alarm or it can be integrated into a larger DIY security system…..Jason the ‘DIY Hacks and How Tos’.
Safety Note: Working with Lasers:
Cheap laser pointers that you find in most stores are generally restricted to 5mW or less. These are generally considered safe. However, it is still possible to damage your eyes if you are not careful. When working with lasers, it is a good idea to wear the appropriate eye protection. Avoid looking directly at the laser diode. Also never point lasers at aircraft.
Here are the parts that you will need for this project:
Laser Pointer. Printed Circuit Board. 555 Timer IC. IC Socket (optional). 3-12 Volt Buzzer. Switch. CdS Photoresistor. 2 resistors. 3 AA Batteries. 3 AA Battery holders. Jumper Wires. Heat Shrink Tubing
Assemble the Circuit:
Once the whole circuit is soldered to the board, test it again to make sure that everything is working properly.
Secure the Loose Parts to the Board with Hot Glue:
The switch and the batteries are connected to the board with wires. I used hot glue to secure them to the circuit board.
Mount the Laser Pointer and the Alarm Circuit to Form a Single Beam Tripwire:
The simplest way to set up your alarm is as a single beam tripwire.
Use Mirrors to Make a Multibeam Tripwire:
A single tripwire beam works but with the addition of a few mirrors, you can have the laser crisscrossing all over the room making it impossible for someone to avoid detection.
Head to the source article for complete instructions and details.
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