Adam,
I build some IOIO board based trial systems, facing similar problems. Then
I got into problems with housings, etc. Since I was building these for club
use, I needed to be sure that my experiments do not cause harm to others,
like our junior members, I had to abandon my home-build hacks. Radio
disturbances was one issue.
Therefore we developed the UART extension board, it works and all
connetions are already tested. Soldering RJ45 connctor to PCB holes is mch
easier than building specil abes, etc. There are jumpers to select where to
feed 12V etc. It also has build-in splitter for FLARM use, and it solves
the problem of declarations when IOIO board and external displays are
connected parallel. We try to keep it's price as low as possible. Currently
we are out of stock, but we can get factory made circuit-boards in two
weeks, is someone wants.
I have some IOIO boards we used for testing, and RS232/TTL level sifters, I
can sell on low price, or donate, those for student projects, etc.
2012/9/11 Adam Webb <a...@adam-webb.com>
> Thanks everyone for your replies. I've tried swapping both the TX/RX in
> the cable (GPS-NAV - MAX323) and between the IOIO board and MAX323, and
> every combination of the above.
>
> Jacques, you're right the picture was taken during one of the the
> 'reversed' tests, I have since returned it to its 'default' position.
> Datasheet is attached, but reading it is beyond me.
>
> As for tracing voltages, with no power to the IOIO board and the GPS-NAV
> plugged in, both the 3 and 4 pins on the IOIO board are receiving a current
> from the MAX323, not sure what this is all about, I would expect only the
> IOIO in pin to be receiving anything, especially given that the MAX323
> board isn't even powered... But then my knowledge of this stuff isn't great
> (as you've probably guessed).
>
> The HelloIOIO program works fine, but I might try updating the IOIO to the
> latest firmware next.
>
> Hopefully I'll have a chance to try another MAX323 board to check that
> this isn't causing my grief in the next day or so.
>
> Thanks again to all who have helped,
>
> Adam
>
>
>
>
> On 11/09/12 07:17, Jacques Legalland wrote:
>
> Hi Adam,
>
> I looked at the picture, you have to swap the blue wire and the yellow
> wire between IOIO and MAX 323 :
> IOIO 3 => Tx MAX 323
> IOIO 4 => Rx MAX 323
>
> > I've tried swapping the TX/RX over.
> Where ? Between GPS Nav and MAX323 or between MAX323 and IOIO ?
> The rule is Tx of a device to RX of the other one.
>
> What about the Xcsoar's configuration ?
>
> Have you the datasheet of the MAX323 module ?
>
> Jacques Legalland
> http://legalland.free.fr/Tuto.html
>
> ------------------------------
> Date: Mon, 10 Sep 2012 11:38:44 +1000
> From: a...@adam-webb.com
> To: xcsoar-user@lists.sourceforge.net
> Subject: [Xcsoar-user] IOIO Problems...
>
> Hi All,
>
> I've just put together my IOIO board, with MAX323 etc, and I'm not getting
> anything from it.
>
> Attached is a picture of the finished (ish) product, the IOIO board talks
> to the phone (SGS2 - until the Streak arrives) fine (hello IOIO works
> fine). I am trying to test it by plugging the DB9 into by GPS-NAV via a
> standard serial cable. I have tested voltage at various points on both the
> MAX323 board and the IOIO and that seems to be working ok, and I've tried
> swapping the TX/RX over. There is a better quality (but larger) pic here
> http://www.adam-webb.com/website/ioio2.jpg.
>
> The only suspision I have is the MAX323 board was different to most
> pictures which I have seen on various sites/emails. The board looks
> something like this
> http://i.ebayimg.com/t/RS232-Serial-TTL-Converter-Module-MAX3232-MAX232-/00/s/Mzg4WDUwMA==/$(KGrHqFHJEIE915gDK!pBPhpQE2hy!~~60_35.JPG,
> and I have removed the 'jumper' style connections to make things a bit
> tidier, and wired the IOIO board onto the bottom (right in the above pic)
> set of points.
>
> Can anyone give me either a hint at what my problem might be, or a way to
> test out various points?
>
> Cheers
>
>
> - Adam
>
>
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