>> I know you are out there, somewhere, and I need your help. I'm looking >> to build a small circuit of some kind which will sense whether AC is >> present or not and if it goes off, then a program which will shut down >> my beige G3 fileserver after say, five minutes or so. I know there are >> newer UPS systems designed for this purpose, but my APC UPS is but a >> couple of years old and I just bought a brand new battery for it! Call >> me cheap, call me dumb, I don't care, I just would like to do this >> project for something to do and to save a few bucks in the process.
A keyboard will have all the signals you need. Just wire into the power and enter keys, add a couple of relays, and there you are! Use a wall-wart to provide a trickle charge, a capacitor to provide the delay, and an NC relay to "press the button." When the power goes, the capacitor discharges into the relay and once drained allows the relay to close, "pressing" the power key. This could be tweaked to delay opening of the relay when the power comes back, so turning the computer back on. A quick bit of testing reveals that (at least under OS 8.6) you can't just press the power and enter keys at the same time, which complicates things. Either two time-delays have to provided for or you'll need to run a program that automatically presses the enter key when a dialogue comes up--maybe not something you want active on a server. =) Whaddya think, everybody? Do I need one of these to shut me down at 11:00 PM? :-) Cheers, Jesse -- G-List is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- We have Apple Refurbished Monitors in stock! | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> G-List list info: <http://lowendmac.com/lists/g-list.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[email protected]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/g-list%40mail.maclaunch.com/> iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
