Sending analog data via 433MHz modules

Discussion in 'General Electronics Chat' started by @lpha, May 23, 2012.

  1. @lpha

    Thread Starter Member

    Feb 21, 2012
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    Hello
    what is the best way to transfert at 433MHz via Aurel Modules three analog inputs 0 to xx mV or 0 to 5V ???

    Nobody use a 433MHz transmissions in my location, so i think that I dont need to coding data

    Modules are Aurel Tx boost 400mW (AM) and Rx is superheterodyne receiver
     
  2. @lpha

    Thread Starter Member

    Feb 21, 2012
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  3. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Do you have the datasheets of the transmitter and reciever?

    Bertus
     
  4. @lpha

    Thread Starter Member

    Feb 21, 2012
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  5. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    From the datasheets I can tell the modules are designed for digital communication.
    If you want to transfer the analog signals using these modules, the signals need to be digitized.

    Bertus
     
  6. @lpha

    Thread Starter Member

    Feb 21, 2012
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    ok, but the question is how can I digitize the 3 analog inputs ?
    how is the best IC to do this, and how can I do to serialise the 3 digital data ?
    It will be ok with the DTMF coder/decoder ?
     
  7. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    A microcontroller can do both digitizing and serialising the data, as well as error checking and ensuring the packet was delivered.
     
  8. rogs

    Active Member

    Aug 28, 2009
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    No - the modulation frequency is only 4KHz, so any 'digitized' analogue signal can only have a maximum frequency of 2KHz (Nyquist Theorem max --in practice a bit less!)

    As kubeek says, it's best to use a microcontoller to 'digitize' your data, but you need to keep the 'analogue audio' bandwidth below 2KHz....
     
  9. @lpha

    Thread Starter Member

    Feb 21, 2012
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  10. @lpha

    Thread Starter Member

    Feb 21, 2012
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    have you a web link with a µC project ?
     
  11. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    You can not use the DTMF devices as the signals are still analog.
    The modules ONLY accept digital signals.

    As for the analog signals:
    How fast and how accurate do you want to transmit them.
    A higher number of bits used for the digitizing will reduce the speed of transmission.

    Bertus
     
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