Laser Security System

I will show you how to build a laser security system that will cost less than 10 dollars.

Step 1: Materials

You will need
-a laser or laser diode
-Multiple mini mirrors depending on how large the project will be (you can find these at the dollar store)
-a laser sensor

Comments

[Ranie-K]

Are these photos taken by you? Have you actually built such a system?

[Build it and Fix it]

i build it but the stock pictures are much clearer

[Ranie-K]

Are the owner of the pictures OK with that?

[Build it and Fix it]

yeah im pretty sure they are

[dombeef]

email them to be sure, i could find all of these on google images, please put your own also with them or i rate it a zero. As far as I know, you dont even own a laser pointer and this setup

[Build it and Fix it]

i swear to god if you buy me a camera i will build this again and i will take a picture every 5 seconds. and yes i own a laser pointer but i do see your point you have no proof. im truely sorry about that

[dombeef]

Do you have a phone, webcam? Use those if you have them

[aeray]

Incomplete.

[dombeef]

I agree

[guys no]

this was a little confusing but i managed to build it and its pretty cool. i got my sister with it haha it was classic.

[adamazing]

There are a few things that need improvement.

All the images you've used are stock images. It'd be better if you took pictures of your project as you built it. Also, it would be helpful to include some sort of a circuit diagram that shows how you power your laser diode.

How did you build the circuit that handles the "beam break => alarm" part of the system? When you say "laser sensor", did you use a photoresistor? Did you use a small piezo buzzer or do you turn on a higher power piezo siren with a relay?
When you say "Less than 10 dollars", can you give a list of all the parts with their prices? I assume you mean US dollars.

[Build it and Fix it]

well i built this with a circut i got from a mcdonalds toy. i probibly should have included that. yes i ment photoresistor i just thought it would be eaier for people to understand if i said sensor. I used a small piezo buzzer but i would most likely work with a higher power piezo siren you might just have to add more power. and i said less than ten dollars because i depends on the quality of the parts you buy and where you get them from the prices should be available on google

[adamazing]

Which toy? Which parts would someone need to buy? You tried to make it "eaier [sic] for people to understand", and yet you haven't included the most basic of information required to recreate your project.

I used a small piezo buzzer but i would most likely work with a higher power piezo siren you might just have to add more power.

Ah...ok, I think I know why there are no pictures of your project. ;)

[rimar2000]

I agree, I don't understand this instructable.

[xXLab_ManXx]

ditto

[dombeef]

likewise

[smessud]

I would very much like to see photos of the installation
.
I tried it once, with very amateurish means (laser pointer + photo transistor and not talking about the mechanical part), and I had a lot of trouble with stability.

I am talking about mirror vibrations induced by cars or even human steps.

When you add a few mirrors in series, the cumulated vibrations give you a large error in the final angle.

As I remember, I saw the final beam miss the photosensor by around 10 cm with 6 mirrors and a total perimeter of less than 2 meters.

Have a nice day everyone.

[Build it and Fix it]

Hey
sorry i dont have actually pictures but me and my friend came up with this idea when i was at his house and we didn't have a camera thats why they are all stock photos. But i suggest getting bigger mirrors so if the vibrations move it the mirror will still catch it. Also try to hold the laser and the mirrors with something that hardens like epoxy glue or solder if you are having trouble. This is just a basic guide so there might need to be some tweaks depending on how you build it, the type of materials you use, and the lay out you put it in. Sorry about the inconvinience.