How To Build A Laser Security System
In case some people are messing with your things or belongings and you are sure it is not your cat
, so to catch then in the act; a Laser Security System could help. The word "Laser" it"s an acronym for "Light Amplification by Stimulated Emission of Radiation", and a Laser Security System is a security system which use laser beam/Infrared as a detector to detect movements and to switch on the security alarm or to order a camera to take a picture.
The following advantages could be taken from a Laser Security System:
"Simplicity of installation.
"The effective ability to be used indoors and outdoors.
" It could be used as an effective alarm for the house/company boundaries.
"It uses the normal power outlets and telephone jacks in case it used indoors.
"It could be expensive and could be difficult for many customers to afford it.
This article can help you to get over the fifth point which is the "High Expense" of this system by building a DIY laser security system.
Here are the things you will need to build your security system;
"A laser pointer.
"Duct tape.
"Small mirrors.
"LM741 microchip.
"220 ohm resistor.
"Photo cell.
"Inexpensive digital camera.
"Extra small screwdriver.
"Wire coat hanger.
"Thin insulated wire.
"Printed circuit board.
"9V battery.
"9V battery clip.
"Soldering equipments.
"Wire cutter.
"Soap caddy with drain holes.
"Voltage relay.
Step 1: Build the Circuit.
1.Set the microchip on the printed circuit board.
2.Put in the voltage regulator.
3.Connect the battery clip leads to the regulator.
4. Run 2 leads out of the regulator.
5.Put in the resistor and the photo cell.
6.Link the microchip to the photo cell.
7.Put in the voltage relay.
8.Link the chip to the voltage relay.
9.Link the other side of the relay to the power.
Step 2: Work on the camera.
1.Disassemble the camera to access the board connected to the trigger button.
2.You may have to remove the board to get a good solder point.
Step 3:
1.Look to the two small terminals that lead to the trigger button.
2.Solder wires from each terminal and feed them through the trigger button hole.
3.Reassemble the camera, and in case it didn"t; use the duct tape to hold it together. But be careful with the lens.
Step 4:
1.Put the circuit inside the soap caddy and the photo cell is exposed behind one of the holes.
2.Connect the battery with the circuit, and use the duct tape to hold the circuit and the battery inside the caddy.
3.Step in the two wires from the camera from one of the caddy"s holes and attach them to both sides of the voltage relay.
Step 5:
1.Cut the coat hanger into several pieces.
2.Tape one piece to the laser pointer and the other to the back of the mirrors.
Step 6:
1.Tape the camera above the caddy in a way you can see the caddy"s holes, and the lens is pointing to the object that you want to protect.
2.Position and secure the laser pointer to a convenient place.
3.Place the mirror to create a perimeter around the object and adjust them until the laser hits the photo cell.
Step 7:
Break the laser beam to test the system to make sure that its working.
Abracadabra, now you have a DIY laser security system. And now you can confront the criminal with clear evidence.
by: Israa Sabha
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