loading
Don't have any of those luxurious security systems? Lack of budget? You can have your own now without spending too much!

Step 1: Materials Needed

For the battery, we used battery out of coins and foil (the one I posted a while ago).

Step 2: Schematic Diagram

Step 3: Connect the Parts.

Solder the parts according to the schematic diagram. Then put in a place where in it is hidden. In our  case, we put it in a flower designed pen. I wrapped some parts of it with a electrical tape to secure them properly.

Step 4: Test It.

As you turned on the switch, the buzzer rings continuously but when you point a laser on it the ringing sound will stop.  Multiple reflections can be created by using mirrors to make it more complicated just like in the movies. :)
I would like to make one if I knew more about electric wiring. I have no idea what that is on the left in your schematic. Could you explain more. I wired my shop with 2 sirens, 6 zones, 3 PIRs, 8 magnet door switches, 3 windows w/foil tape, smoke detector, and EOLRs on all, but I am too dumb to understand your drawing. <br> <br>What happens if someone breaks the laser beam momentarily? Does the buzzer keep buzzing or turn back off? <br> <br>That photo of &quot;Photocell&quot; in step #1....can that carry 100 Watts at 120 Volts? <br> <br>Interesting, thanks for posting.

About This Instructable

7,658views

22favorites

License:

More by MICROTRONICS:Laser alarm system Cheap wireless house alarm system Battery out of coins and foil 
Add instructable to: