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If you have had your computer fall asleep at the worst possible time before you know how frustrating it can be. Todd Harrison from Toddfun.com has come up with a solution. He built a simple battery operated Keyboard Keep Alive Circuit that he stuffed in a cute candy tin shaped like a Wiimote. This circuit closes a relay contact every 25 seconds. Next he connected an interface jack to his keyboard to that the relay can “press” a key when the relay closes. He selected an arrow key but a shift key or something like that would have worked just as well. This circuit would be great to hide inside a keyboard and have it press the caps lock key every 5 or 10 minutes, that would be enough to drive someone mad! If you are looking to solve the same issue there is a device called the mouse jiggler that would do the trick, it is a USB device that slowly (or violently) jiggles the mouse, there is also a neat way to make a DIY jiggler using an optical mouse and a watch.
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February 8th, 2010
Or, you could get a simple microcontroller to send whatever command you want whenever you want for $10.
http://www.sparkfun.com/commerce/product_info.php?products_id=9147
February 8th, 2010
Hi Odin,
That’s a cool (and cheap) circuit you linked to there.
February 8th, 2010
Actually, there’s a cool and cheap circuit _you_ linked to
http://hackedgadgets.com/2009/11/29/automatic-caps-lock-prank-circuit/
February 8th, 2010
Why not just disable the sleep mode. Even cheaper!
February 8th, 2010
Scott: sometimes you want it, sometimes you don’t. It’s a hassle going through the settings all the time, and on a public/other person’s computer you may not be allowed, not want to, or not even know how if it’s a different OS.
February 9th, 2010
so plugging in another keyboard device into an unknown computer is just as a good idea as taking the time to find out how to disable a power setting?
February 9th, 2010
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February 9th, 2010
So instead of doing a simple OS change, you do a hardware change on someone else’s PC? Umm, no. Just go under Display Properties, Screen Saver, click the Power button. Takes seconds, lots less work.
Article is still nice for giving ideas on what else could be done.. like maybe hooking it up to the “W” key, so your player in World of Warcraft doesn’t get logged out for inactivity. (Careful though, if you use that to perform automated actions, they can, and have, banned people).
February 9th, 2010
I understand him being very lazy changing the settings.
If it is a windows computer (which it looks by the keyboard) then use Autoit.
Couple of line of script codes and you can switch between power saving on and off.
You can even take the script with you on a USB stick.
Anyway, nobody mentioned he is fed up with someone else’s computer. Most probably he is talking about his own computer.
February 9th, 2010
Guess this solution came from a hardware hacker. ( If all you have is a hammer, every problem starts looking like a nail. )
February 9th, 2010
Or perhaps you could just disable all the annoying power-saving options. Just a thought…
February 9th, 2010
back in win 98 something similar was possible by pressing win key. You just press “win” and while start menu was opened on top PC was unable to start screensaver(I didnt used sleep mode back in age of w98, os i dont know if it applies to sleep,hiberate…) or maybe, some kind of script which can change power setting properties should be easier
or use of power profiles, but do they work same way on PCs and laptops?
February 9th, 2010
Why not use one of these to hit the key every 30 sec or so? AND it’s easy to move from PC to PC!!!!
http://www.youtube.com/watch?v=cTkx3cdO5rM
February 11th, 2010
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February 15th, 2010
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June 7th, 2011
I can appreciate the hardware challenge in making something like this but also can’t help but think that it probably would have been a whole lot simpler to just download one of the numerous freeware programs designed to do much the same thing but using software instead of hardware. These programs typically insert ‘keystrokes’ into the keyboard buffer that is read by the operating system.