I really like the TV-B-Gone and thought it would be neat to create a similar prank like device. What i have created is a USB device that can trigger several actions on a computer, the idea being you have this device plugged into a computer you are wishing to prank and then you trigger the device and it then will preform a variety of operations including but not limited to.
  • Closing the active window on the computer. (this is what i use on the demo)
  • Locking the computer screen
  • bringing up the the Ctrl-Alt-Del screen
  • Shutting down the computer
  • move the mouse around the screen
  • type something out
  • Anything else you can do with a keyboard/mouse
I will be playing around in the future to give it more options(this is only version 1) and different methods of triggering but for this first device i have it triggering a single operation using a photocell(a resistor that's resistance value changes with the amount of light hitting it) And i will be using a laser pointer to trigger the device. 

This idea came to me after watching Irongeek's Defcon presentation on the Teensy i would encorage you to check out his page on the teensy as well as the talk he gave over it: Here is his page

Please note: This is meant as a prank, and its funny to close a friends facebook page from accrost the room sure... not so funny to close someones term paper night before its due so keep this in mind before use, i hold no responciblity for any harm that may befall you in inproper use :P

Step 1: Supplies

Supplies needed
  • Teensy(any teensy will work i'm using the 2.0, available here http://www.pjrc.com/teensy/)
  • Photocell(10k Ohm)
  • Enclosure(I am using an Altoids tin although there are much smaller less conspicuous ones you can use) 
  • Cable(USB A male to USB B mini)
  • Computer to program it
  • Resistor(10k)
  • Hook up wire
  • zip tie
  • Hotglue gun
  • Duct tape
  • Drill w/ bits

Nice to have
  • Female header pins to attach to teensy
  • Prototype board/male header pins
how bout one for over wireless networks or over LAN
Have you thought of using some sort of rf remote so you do not have to try to shoot a laser pointer across the room to his a small target?
Yes i have thought of that, a bit easier solution is to install a IR receiver then set it up to use a IR remote control to trigger functions I am working towards a 2nd version of this project that will focus more on some more advanced code rather then the hardware side of it, but i do like your RF idea and maybe down the road something along those lines will be added.
Great idea I will look into it more.

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