Protect Your Home with Laserbeams!

Here is an easy to make and powerful laser alarm system that can protect your entire home, indoors or out! My inspiration for this project came from Brad Graham & Kathy McGowan. Watch the video for details and the Test Results. You'll be impressed. I hope you enjoy this Instructable.

Step 1 What you need...

1. 2 small project boxes
2. 1 1000uF 35v Capacitor
3. 1 5K Variable Resistor
4. Photocell
5. IC Board
6. 9v battery and clip
7. 1 N3904 Transistor
8. Toggle switch
9. Small mirrors
10. HandiTak
11. 12v DC Piezo Siren - 102dB
12. Aixiz 650nm 5mw 12X30mm laser
13. Aixiz 3.2v AC Adapter

Comments

[isonu]

any body tried this .does it works

[pep2798]

it all works but is backwards like when i shine light on photocell it makes the buzzer louder please help me

[manikantak136]

sir,
iam interested in making laser security system,so can u please send
me the steps and the things to use in making it.please send it to my
email ([e-mail])
thankyou.....!

[amioten1]

is it possible to instead use an indicator light instead of a speaker

[sputhran]

but it then if ur far from the machine i can u know that intruder came

[lazarzoltan]

from where can i get the photocell peoples?????

[amioten1]

buy it from e-bay

[nporter2]

hi

could someone please post a schematic for a 12v dc 1A power supply to 4.5v 45mA laser with a 'normally closed' output on it.

cheers

[lazarzoltan]

Hell!
I can use other transistor?

[pizza1993]

Hello everyone!I just want to built a similar protect system but i face off some difficulties.I built this (http://lookfwd.doit4me.gr/ge99149/electronics/alarm/alarm.gif) circuit for laser receiver and this siren(http://www.eleccircuit.com/wp-content/uploads/2007/06/asiren.png) but when the beam look the laser diode the output is 1.36v and when the beam is interrupted the output goes to 3v which isnt enough to drive the 12v siren.
Any Idea?

Thank you in advance!

[dasimpson1981]

a normal realy wouldent stay on you would need a latching realy that keeps the realy on when triggerd

[maremil143]

I mean , CAN i ask you.. for the circuit diagram or connection
of all the given..?

[dasimpson1981]

hope this helps

[maremil143]

PROTECT YOUR HOME WITH LASER !
that's the title MR. DASIMPSON
TNX..

[maremil143]

Ahh MR. DASIMPSON1981.... CAN i ask you.. for the circuit diagram or connection
of the given..? i saw that on youtube..

[maremil143]

Ahh MR. DASIMPSON1981.... CAN i ask you.. for the circuit diagram or connection
of the given..? i saw that on youtube..

[maremil143]

PROTECT YOUR HOME WITH LASER !
that's the title MR. DASIMPSON
TNX..

[abalachandran]

My brother says the circuit is wrong, is he wright and if he is can someone send me wright circuit plzzzzzzzz . This is my email [e-mail].

[umar abbas]

hey can i use this variable resistor....

[umar abbas]

plz help me ....... when i connect the circuit it didn't works .... i change my materials two time still its not working ... also i make it on printed circuit board but still not working ... hope for any help

[engineer mohammed saber]

this is the correct skematic just swap the led for a realy or buzzer

if you wont the circuit to detect darkness instead swap the ldr and variable resistor places

[xqw]

plz tell how cn v adjst the resistor

[loganemacf]

For a MUCH better schematic, check out cinnamon424's video on youtube!

http://www.youtube.com/watch?v=ejdgshO0k8g

[dasimpson1981]

this is the correct skematic just swap the led for a realy or buzzer

if you wont the circuit to detect darkness instead swap the ldr and variable resistor places

[steaming punk]

hi, your skematic works well with led or buzzer for example but doesent activate relay for some reason, somebody noted that its AC and for that the realy doesent work. i tried to convert it to DC with four diods but this didnt help either. can somebody please help ?

[dasimpson1981]

have you checked to see if the realy can be triggerd on 9 volts

[steaming punk]

works fine with 9 volts, actually works even from 5 volts

[dasimpson1981]

this was the other circuit i found

[steaming punk]

oh, i just tested out this skematic and it worked fine :), used 5k ohm pot and 2n3904 transistor, thanks alot for that

[dasimpson1981]

no problem always glad to help

[dasimpson1981]

ok also wat current is used to hold the really open maybe the electro magnet needs more current then the transistor can supply

[steaming punk]

this might be the problem, it says 1A on it but i dont know if its min or max current for this relay to be functional

[randomness72.5]

(removed by author or community request)

[dasimpson1981]

yeah the box with the arrow is the variable resistor the arrow would be the middle connection on the variable resistor they are 3 terminals use on of the outer ones and the middle one

[bo0mbo0mpao]

what is that BLUE thingy at the back of the photocell? the rectangular one? what is that?

[akinich]

that is the variable resistor

[TheWaddleWaaddle]

YES IT IS!!!!

[hasow]

Hi people, I have tried to make the circuit but it doesn't work i'm not that good witch schematics, can someone help me please. i have linked all the parts like this:

[EngineeringShock]

The Schematic makes no sense. It is suggesting that there is always 9v tied to the base of the transistor. This will not only hurt the transistor, as there is no protective resistor, bit it renders the entire photo resistor divider circuit useless.

[lazarzoltan]

is no good