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Thread: wireless usb touch screen power?

  1. #1
    MySQL Error soundman98's Avatar
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    wireless usb touch screen power?

    primarily power questions, but there is some other stuff here too..

    since mp3car posted the video in the blog about the remote video display, i have been pushing a idea of a remote usb screen around in my head.

    i am planning this to primarily be a secondary mirrored display, that when mounted on the dash, a carnetix unit and battery will be bypassed, and will be powered by the 5v line off my dsatx, and then be able to pull it out at shows or whatever later, and run it off the battery and be able to see and control everything without actually being in the car.

    so i am slowly assembling parts for this:

    currently, i have purchased a 4 port wireless hub
    http://www.frys.com/product/5980804?...H:MAIN_RSLT_PG

    and am working on the next purchases-- a lipo battery, mimo 7" touch screen, and 5 volt power regulator.
    carnetix power regulator:
    http://store.mp3car.com/Carnetix_CNX..._p/pwr-016.htm
    mimo screen
    http://store.mp3car.com/ProductDetai...Show=TechSpecs
    lipo battery:
    http://www.amazon.com/11-1V-1350mAh-.../dp/B002QX6B6Q

    heres my questions and reasonings--
    i chose that size/voltage lipo pack(3 cell, 11.1 volt) because i already have a balancing charger for a pack very similar-- so charging later on won't be as tough, or require any other special stuff for charging.

    i know i need a low voltage cutoff, or battery gauge to keep from over discharging the lipo pack, any suggestions?

    also, i am open to other 5 volt regulation methods-- as long as it can be done with standard soldering skills, i can handle it.

    any other questions or comments would be appreciated.

    thanks!

  2. #2
    Variable Bitrate
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    use this (or something like it) instead and save a bunch of headache http://www.amazon.com/Kensington-Por...756001&sr=1-20

  3. #3
    What can I say? I like serial. Curiosity's Avatar
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    +1 on that Kensington thing. You can get a cheap 3S LiPo alarm that plugs into the balance tap, but they suck IMO.

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    MySQL Error soundman98's Avatar
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    cool-- that would take care of the battery, guage and charger!

    according to the specs, it should even handle the load from the screen, so i would just need to hack it a little to power the wireless hub...

  5. #5
    What can I say? I like serial. Curiosity's Avatar
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    Didn't MP3Car have a video of a wireless monitor a while back? I think it used the wireless VGA adapter by IOGear though, which uses the same WiMedia band at 480 Gbps max so it looks like it should work, but there hasn't been any tests. So you can be the first! I'm sure it will though. It would be nice to know if there are any issues with continuous streaming.

  6. #6
    MySQL Error soundman98's Avatar
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    yup, that is really what started this whole thing-- they used a wireless vga/usb dongle, so there was no touchscreen... they did it with a hacked up m2, and a laptop battery. though that was right before usb screens hit the market, so the game got easier after that.

    in the video, they said that the usb wireless monitor handles most video streaming fine(in the videothey say that hi-def video stutters a little, but most lower formats are fine), so i am kind of hoping that it will cary over, but i really don't do anything with video on my carpc, so it will just be for a secondary front end/ audio control screen...

    it is probably gonna be a couple of months before this is completed(car needs work), but is in the works!

    the other cool thing about the wireless hub is that i 'should' be able to plug a flash drive in at the wireless screen and be able to play the files back wirelessly-- though it might be asking too much, given the high bandwidth requirement of the screen..

  7. #7
    ez_
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    i am not sure but in order to use the touchscreen function would you need a device similar to this : http://www.cablestogo.com/product.as...latedItem=true

  8. #8
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    He's using a 4 port wireless hub already.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  9. #9
    MySQL Error soundman98's Avatar
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    ok, a little update: not much has happened, but i am entertaining this idea once again.

    looking at different battery pack solutions right now, i like the kensington solution, but have no idea how long it will last-- i can't seem to find any technical documentation on the size, or mah rating of the lipo pack they are using.

    just doing the power calc. in my head a 1,000mah pack is about the limit for any acceptable run time out of a setup like this.. the hub is rated for 3amps, but i am figuring that the hub will take 0.5a, and the screen will take 1a...

    so i feel i need to get a pack that actually lists the ratings:
    http://www.amazon.com/New-Trent-Dual...703398&sr=1-14

    or

    http://www.amazon.com/Rechargeable-B...704593&sr=1-18

    anyone ever used anything like this, or have experience with this brand?


    for the screen, i am now considering getting the lilliput usb screen, being that it is a little cheaper then comparative mimo screens, and the back is more boring-- meaning that there are either nooks and crannies that i can stuff parts, or a project box glued to the back will be less obtrusive...

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