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Data transfer using audio/cell phone

Discussion in 'Beginner Electronics' started by Coyoteboy, Feb 10, 2005.

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  1. Coyoteboy

    Coyoteboy Guest

    Hi all, not sure if this has been asked before but I'll ask it again
    and you can moan if it has :)

    I'm looking to place a remote metering device approximately 25 miles
    from my house - the only wireless method of data comms i can find is
    using gsm technology. The price of a GSM specific board is seriously
    prohibitive, especially as a) the device will be in a fairly insecure
    location and b) is only a fun project. I do, however, have a stack of
    old cell phones sitting around-anyone know if i can modify one of the
    older types to accept serial data from my device and be
    'dial-into-able' from a standard modem so I can grab current data? I've
    seen a fair few companies about it but they all quote 500+ for this
    sort of setup, which is just beyond a students limits lol.
    Anyone know of anyone who has done a similar thing before? Seems like
    something someone would have attempted, if you see what i mean?

    Any help appreciated, google is only good at returning commercial
  2. brit-dub

    brit-dub Guest

  3. anon

    anon Guest

    The text message thing would work ... wheather you want to use that depends
    on the type of data your sending ... You can just build a serial connection
    on your board and add some code to your PIC to control the GSM phone, using
    it's AT command set ... to send a text message AT+CMGS <followed by the PDU>
    .... or use ATD<num> to make a data call back to yr modem ....
  4. Coyoteboy

    Coyoteboy Guest

    I'm looking into using a nokia mobile linked to the pic via an mbus
    cable - should be able to do what i require - got a few nokias hanging
    around :) just got to get the phone set up on a 'charge-the-recipient'
    sim card, if possible.

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