Laser Beam Alarm System with Rechargeable Battery for Laser

Step 10 Possible Improvments and Closing Comments

Well that it. You should have all the info you need to make your own LASER BEAM ALARM SYSTEM by revhead... me!

some possible improvements/modifications that could be made to this are; a battery status indicator could be added to the rechargeable battery that powers the laser; an automatic cut off for the solar panel so that when the battery reaches full charge, the solar panel will automatically stop charging the battery; a green laser is much more reliable, more stable, brighter, and travels greater distances than the cheapo red ones that I used plus they are really cool; a DC voltage converter could power the LDR and Alarm circuitry removing the need for the two 9 volt batteries; and you could rig this up to a microcontroller and some servos that would fire a bb gun/paintball gun all around the area when the laser beam is tripped!!
I have neither the skills, knowledge, nor the equipment to pull that last one off but if someone does it, please let me know.

Anyway, that is my instructable on how to build a LASER BEAM ALARM SYSTEM. I hope I was very clear and thorough in my explanation although I am sure that many people will need to read it twice to understand it because it can be confusing. If you have any questions, suggestions, hints or tips, please dont hesitate to leave a comment or to send a personal message. I will make a solid effort to answer each and every one of them.

Cheers and happy building!!

Comments

[mayur.phadte]

can u name the relay please..!
My shop vendor says he cannot sell components without proper name,the police has prevented them from doing so.

[revhead]

um ok haha. from memory mine was called a "5 Volt Reed Relay"

[mayur.phadte]

dats it?

[revhead]

yeah, thats what the relay is called. well, thats what its called in australia.

[benzy4iva]

rev thanks for ur good works..i wanna kno if i can use any relay not being a reed relay...the reason is i cant find the reed one in my side of town

[revhead]

you dont have to use a reed relay, i just chose to use it becasue of its simplicity and ability to work with very low current/voltage. you can try to use a standard relay (not sure if it will work in this circuit?) but buy a small one that is designed to work with small current and voltage.
let me know how u go with it!
cheers!!

[frank buxton]

I agree totally with your project and congratulate you for an astounding work piece. I find it interesting glancing through your project, but if you could convince me on you voltage and current ratings of your components, I think it would be much formal and complete a project.

[revhead]

thanks for your feedback, where do you suggest specifically that i need to improve my description?
Cheers!

[ramirzeus]

hi bro!
can you please tell us how to connect the 2 schematics you draw 1 is with LRD and 1 is with buzzer or alarm on this part i'm so verry confused. thank's

[akinich]

you connect the contacts of the alarm circuit to the reed in the reed relay
and the relay pins parallel to the led in the lrd circuit

[bamphy]

I like the Instructable, but I would like to see it incorporated with a webcam. but that is another story and another Instructable

[akinich]

hey what happened to all he comments i sent you?

[revhead]

i just checked instructables and they are all there? i answered them all and nothing seems to be missing. try opening it again, make sure you are loged in correctly, refresh the page. hope this helped

[akinich]

hey can you paste a picture of the circuit with both sides facing properly so i cam show it to my teacher (no problem know?) by today it is 7 30 am in chennai

[revhead]

sorry, i just went to the personal message thing and found out that you cant attach pictures. personal message me your email and i will send them to you that way. i dont know if you will get them by the time that you asked for. i only just got back from school and saw your comment. it is 5:07 in australia, 25th feb.

[akinich]

no i want the alarm circuit diagram not the pictures of the circuit because the digram is not proper half of it is upside down

[revhead]

oh sorry. the circuit diagram that is up there now is fine, just the writing is up side down, all of the components are in the right place. you could flip the alarm circuit if you wanted and it wouldn't matter because all that connects the alarm circuit to the LDR circuit is the relay. the relay does not carry any electricity, it is only a type of switch. all you need to do is make sure that the coils of the relay (looks like a spiral spring in the diagram)are connected to the LDR circuit, and the reed switch (looks like a normal switch in side a tube on the diagram) of the relay are connected to contacts 1 and 2 of the alarm circuit. I hope this cleared things up. I know this sounds confusing and it does. my advise is this. build the first half of the circuit (LDR) on a separate board. then build the second half of the circuit (ALARM) on a second board. then get a relay and connect them together. this would be much easier than trying to put it all on one board. I hope I helped clear this up, feel free to keep asking questions, I am happy to answer them, I will try to guide you through the circuit step by step when you start the build it.

[akinich]

(removed by author or community request)

[revhead]

you might want to delete your comment that gives me your email. now that I have it you should remove it from the page so that other people don't use it which will result in you getting millions of junk email's, just looking out for you!

[akinich]

and it is also the 25 for me it is 7 12 pm