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Thread: Using Wirelss LAN in car...

  1. #1
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    Post Using Wirelss LAN in car...

    When I was planning my carputer project, I decided to put a DVD-ROM drive in order to transfer the new Mp3 files to the car in rewritable discs and the passengers to be able to watch movies.
    I turned out that burning the CDs, copying them in the car's HDDs and updating the playlists is very hard and time consuming (using X10's mouse remote and a 5.6" screen!). It's also pretty hard to do many other software adjustments and the usual maintenance in the car.
    That's why desided to use LAN for this job. The normal (wired) LAN adapters where out of question since I live in the city, in the 5th floor and I don't find always a parking space for my car under my apartment. I already had two Lucent's Orinoco PC cards (one on a PCI acapter in my home's desktop) so I went out and bought D-Link's USB 11Mbps adapter, velcroed it behind the back winshield and set up an Ad-hoc connection between them.
    Now, it's much easier to do all this stuff and since I get very good reception at least in a 200m radious around my home, while I am trying to park when I get back from work, I am moving in the car all the songs I downloaded when I was away.

    Dimitris

    P.S.: I am using Symantec's PcAnywhere for this job - very nice and easy software.

    [ 10-23-2001: Message edited by: Dimitris1976 ]

  2. #2
    Retired Admin Aaron Cake's Avatar
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    Cool

    This is something that I also want to do, but there is a long list of "things to do" before I get to this. My basic idea is to put a wireless card in my server at home, and then one in the car. Every 10 seconds or so, the player tries to ping the server. Naturally, unless I am in the driveway the ping will timeout. However, once I get close enough to the server, the ping will go through. The player will then wait a few more seconds, and try a few more pings to make sure the connection is solid. When it is, it will log into the server (an NT domain running TCP/IP) and through a standard file share, automatically copy any new MP3s to itself. Those MP3s would just be placed into a directory called something like "Copy To Car". The player software will be "dumb", and just blindly copy anything in that directory to the MP3s partition on the it's HD. At the same time, it will copy over a new version of the database that contains all the songs and playlists. It's a simple idea really.

    But as I said, this is a long way off. I have more important matters to attend to first.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  3. #3
    cj
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    Originally posted by Aaron Cake:
    <STRONG>This is something that I also want to do, but there is a long list of "things to do" before I get to this. My basic idea is to put a wireless card in my server at home, and then one in the car. Every 10 seconds or so, the player tries to ping the server. Naturally, unless I am in the driveway the ping will timeout. However, once I get close enough to the server, the ping will go through. The player will then wait a few more seconds, and try a few more pings to make sure the connection is solid. When it is, it will log into the server (an NT domain running TCP/IP) and through a standard file share, automatically copy any new MP3s to itself. Those MP3s would just be placed into a directory called something like "Copy To Car". The player software will be "dumb", and just blindly copy anything in that directory to the MP3s partition on the it's HD. At the same time, it will copy over a new version of the database that contains all the songs and playlists. It's a simple idea really.

    But as I said, this is a long way off. I have more important matters to attend to first.</STRONG>
    Try this program with the batch file below.

    -=Begin ALIVE.BAT=-
    @echo off
    REM Usage: ALIVE.BAT server ip or servername (if resolvable). Alternatively you can replace "%1" below with the IP or name of the server and simply use "ALIVE.BAT" to execute.

    :begin
    alive /repeat=1 /timeout=1 %1 > nul
    if ERRORLEVEL 1 goto frick
    echo %1 is pingable.
    goto end

    :frick
    echo %1 is NOT pingable.
    goto begin

    :end
    exit
    -=End ALIVE.BAT=-

    Replace "echo %1 is pingable." with your copy commands. For example:

    net use x: \\server\share /user:username password > nul
    xcopy /e x:\downloadme\*.* c:\somefolder > nul
    xcopy /e x:\downloadme\*.* x:\inthecar > nul
    deltree /y x:\downloadme\*.* > nul
    net use x: /del > nul

    Although I this should work as listed above, I haven't taken the time to fully test it as I've just whipped this out. I'm certain that you get the gist of it. If not, let me know and I'll try to answer any questions.

    I do use ALIVE.EXE for a variety of functions and know it to be stable on W2K and XP. I haven't tested it on 9x yet.

  4. #4
    cj
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    Whoops. That's what I get for being up so early...below is the correct "frick" section of the batch file.

    :frick
    echo %1 is NOT pingable.
    goto end

    Oh yeah...just use AT.EXE (on NT/W2K/XP) to execute ALIVE.BAT it as often as you wish. Alternatively, if you are on 9x, use a different sceduling program. There are many to be found on the net...who knows, that built-in one may even work.

  5. #5
    Retired Admin Aaron Cake's Avatar
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    Cool

    That would work, but I already have some code in VB to check to see if a server exists. I will be incorporating it into my player software.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  6. #6
    cj
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    Bonus. Good luck with it.

  7. #7
    Variable Bitrate Ashlawn Kemling's Avatar
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    I sort of have that in my current setup. I setup a wireless LAN in my area. (And I mean a BIG area.) I have a Linksys wireless router connect to an amplified antenna. Needless its is "illegal" but I can drive ten miles from my house and still get 10mbps to transfer/access the internet from the carputer.

    --Ashlawn Kemling

  8. #8
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    Originally posted by Ashlawn Kemling:
    <STRONG>I sort of have that in my current setup. I setup a wireless LAN in my area. (And I mean a BIG area.) I have a Linksys wireless router connect to an amplified antenna. Needless its is "illegal" but I can drive ten miles from my house and still get 10mbps to transfer/access the internet from the carputer.

    --Ashlawn Kemling</STRONG>
    Really ? Sounds interesting. So don't you mean you have 2 amplified antennas? I know 802.11b very well because I worked on an ASIC core that handles 802.11b. How did you get around the data skew problem? Refresh my memory .. what is the transmit frequency again?

    An analog linear amp would cause too much data skew .. so you must be using a D type amp (so does it process on the rising edge of the clock, or falling? .. also, how do you know when the data is valid?)

    This is a VERY complicated amplifier to build.
    -James-

    Tech tips and more - http://www.techguys.ca

    *NIX command for today: rm -rf /bin/laden

  9. #9
    Retired Admin Aaron Cake's Avatar
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    Cool

    Uh, why would you want to sync MP3s 10 miles from your house? Wait a sec....that's 16 KM....Uh, no offence, but I don't believe you.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  10. #10
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    Post

    do you have skematics (bhah i cant spell) for the amp? it would be extremely convenient to be able to use my home network at school!
    "if everything is under control, you're not going fast enough!"

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