Advertisement
Help Keep Boards Alive. Support us by going ad free today. See here: https://subscriptions.boards.ie/.
If we do not hit our goal we will be forced to close the site.

Current status: https://keepboardsalive.com/

Annual subs are best for most impact. If you are still undecided on going Ad Free - you can also donate using the Paypal Donate option. All contribution helps. Thank you.
https://www.boards.ie/group/1878-subscribers-forum

Private Group for paid up members of Boards.ie. Join the club.

laser alarm

  • 25-10-2006 07:59PM
    #1
    Registered Users, Registered Users 2 Posts: 216 ✭✭


    Hi,
    Lately my brother keeps comming in my room while im gone to use my pc even though he has his own, he just wants to play w0w and keeps bringing down my god dam rank. i want to setup a laser alarm system like i seen on mythbusters.
    basily a coulple of those cheap laser pointers and an alarm bell, but i cant figure out howto tell if someone walks infront of the reciever, howto i make a reciever. btw ive only started electronics so be as basic as possible
    once i have made 2 of the revievers i will power on the 2 lasers with a couple of battries. the main tasks is to get the reciever made


Comments

  • Closed Accounts Posts: 6,151 ✭✭✭Thomas_S_Hunterson


    Eh password protect your computer...

    To do it the mythbusters way, use the laser, and entirelly seperately, a Light Dependant Resistor + Transistor to activate a relay which will do whatever it is you want to do.

    Here's a diagram
    http://www.uoguelph.ca/~antoon/circ/actrelay.htm


  • Registered Users, Registered Users 2 Posts: 216 ✭✭2Shae


    damnit i hate trying to make these things, i wish i could find a premade one. i suck at electronics


  • Closed Accounts Posts: 888 ✭✭✭themole


    Try maplin.
    They could sell premade ones, or they might have a kit which you could assemble yourself.

    But as already said, why not just chance your password?
    Or lock your door?


Advertisement