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Thread: Trying to find the ultimate power-down solution.

  1. #1
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    Trying to find the ultimate power-down solution.

    I have an empeg car in-dash mp3 player that I would like to remotely sync music to via an in-car wifi access point. The obvious problem is having the empeg and the AP powered during the sync, and hopefully powered down at other times to avoid draining the battery.

    A remote starter kit is an obvious, but ghetto solution, and has several drawbacks. I've also seen that there are devices like this for powering devices off after a timeout, but what I was hoping to cobble together would be something that worked automatically based on the wifi AP being in range of my home network.

    I can handle any of the software chores, including writing a daemon that runs on the empeg player or a wireless AP like the Linksys WRT54G. The parts I'm missing would be a component that can receive commands via serial or ethernet to shut down power to the AP and empeg when my software daemon decides it's not at home.

    Anyone done anything like this, or have any ideas how one might approach this problem?

  2. #2
    Low Bitrate c4shm0ney's Avatar
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    I'm going to ask the obvious but why do you need the access point in your car and not just have an adapter connected to your computer? I think you could probably hack something together that makes a connection to an AP of a specific unique name and completes the file operation from there.
    01 Metro LSI
    79hp 41MPG Highway
    Check my progress
    http://www.mp3car.com/vbulletin/worklogs/51295-01-metro-lsi-4-door.html

  3. #3
    Low Bitrate c4shm0ney's Avatar
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    If you decided to have an AP in your car perhaps you could bridge the AP to your mobo with a cross-over cable and have your PC set to wake-on-lan but depending on how you have your power setup it could be complicated or risky.
    01 Metro LSI
    79hp 41MPG Highway
    Check my progress
    http://www.mp3car.com/vbulletin/showthread.php?t=51295

  4. #4
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    Wake-on-LAN and WiFi cards are not an option, because the computer in question is one of these:

    http://geek.empeg.com/products/car_mark2.html

    It's got an ethernet jack, and only USB slave, so no USB->802.11 adaptor. That means the path to wireless connectivity involes an AP running in client mode. I know that works. The problem is how to power the AP off remotely. I'm hoping a device exists that can take commands on serial (or even ethernet, but that's less likely) and power on/off based on that. (The device in question, of course, would be connected to constant power, but wouldn't use much itself.)

  5. #5
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    There are some Wi-Fi Hot Spot finders, many that take very little juce. (3v @<50ma, enough to pull from your car for atleast a month(I think))
    You could rig one up with a timer that would 'push' the button to find a hot spot, and if a desired signal strangth LED came on, you could power up the pc from that. Makeing it AP specific would be harder. You have 2 options there. One would be to go for a more expenseve AP finder, one that tells you the name, and use some Exclusive And gates(so only the specific LCD segmants spelling your AP would turn on the pc) or use another wireless signal, (Like a RC car controler) that would automaticaly turn it on.
    I think that was what you where asking...
    Every day driver, 1989 Celica. Probly won't get a carpc for a while

    Working on: 1972 240z. Gonna put a V8 and a Turion in it. Best power in bothworlds. Now if only I could get my theoretical boot as low as my theroretical 1/4 mile time (8.22 s)

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