It’s here! I have just released the first version of LibAPRS for the Arduino IDE! You can now write your own APRS firmwares for MicroModem or compatible builds directly in the Arduino IDE. Check out the LibAPRS page for more details. Per the time of this post, the library is considered beta status, so please let me know if you find any bugs! And ask away in the forums if you have any questions

4 thoughts on “Arduino APRS Library

  1. When the serial monitor displays the settings from the basic example sketch, it is showing the lat and long as both N/A.
    I originally thought it may be because I got the format wrong so I changed it back to your example lat and long and it shows the same thing. Any ideas?

  2. I have been looking at the AFSK part of your library with a view to building a replica of the MicroModem on an Arduino Uno basis for the purpose of receiving and interpreting telephone Caller ID information, which is sent in a Bell 202 compatible format with non standard framing.
    Most of the published methods for doing this rely on chips which are now no longer obtainable.
    The Caller Id format is described here: http://www.exar.com/common/content/document.ashx?id=248&languageid=1033&type=applicationnotes&part=xr2211a in an application note (for an obsolete chip).
    The packet framing and modulation part would not be relevant, only the AFSK demodulation.
    I have 3 questions:
    1. can you comment briefly on the feasibility of doing this ?
    2. can you in one short sentence, and a link, state what the mathematical basis is for the AFSK demodulator ?
    3. are you considering creating such an development (as I have described above) as say an example in the LibAPRS library. If so, I would then wait to see what you produce.

    1. Hi DougX!
      It’s interesting that quite a few people have actually requested this lately. I am getting more and more interested in doing a firmware for this purpose, since the interest seems to be there. I’m not making any promises as to when, but I will probably have a go at it :) Thanks for the link to the PDF, that’s great info!

      For your questions:
      1 – Absolutely feasible, and should not be too much trouble, basically some framing and coding changes from the current firmwares. Doable in a few afternoons I guess. I might be completely off, but that’s just my initial guess :)

      2 – I’m not skillfull enough with words to do that in one short sentence. Actually I think the best way I can explain it is how I already did here: https://github.com/markqvist/MicroAPRS/blob/master/hardware/AFSK.c
      The code and comments in that file actually tell it all :) It’s not short, I know, but it’s the best explanation I have!
      3. As mentioned above I am very much considering developing such a firmware. I hope I will have the time soon, but I have one other project I want to finish first :)

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