[arm-allstar] GPIO vs Nano

[George Csahanin]

Oh I have the arduino code for Mac, winders and Linux...and the simulator from ZL land... very familiar...

Looking forward to the gpio stuff. 

George Csahanin
Media General
Sent from my iPhone

> On Dec 6, 2016, at 7:28 PM, Doug Crompton via arm-allstar <arm-allstar at hamvoip.org> wrote:
> 
> George to play with and program your Nano or any other Arduino device
> download the Arduino IDE available for Windows, Linux or Mac.
> 
> https://www.arduino.cc/en/Main/Software
> 
> There are many examples that you can download to the Nano and try.
> 
> When in place RPi Allstar code will automatically download the software to
> the nano when it is in use so no need to have the IDE SW other than to play
> and learn.
> 
> 
> 
> 
> *73 Doug*
> 
> *WA3DSP*
> 
> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> 
> On Tue, Dec 6, 2016 at 5:41 PM, "George Csahanin via arm-allstar" <
> arm-allstar at hamvoip.org> wrote:
> 
>> Barry, I see the thought process, the 'duino is cheap. After reading the
>> explanation a while ago that also 'sprains that this can be used as a gpio
>> expansion for other than Pi the light went on. Got it.
>> 
>> Is the 'duino code "out there"? Pretty useful devices. I evolved a nano
>> into a replacement head for the Micom-2 HF radio. I like the I/O
>> abilities...
>> 
>> GeorgeC
>> W2DB 2360
>> 
>> George Csahanin
>> Media General
>> Sent from my iPhone
>> 
>>> On Dec 6, 2016, at 4:56 PM, Barry Buelow via arm-allstar <
>> arm-allstar at hamvoip.org> wrote:
>>> 
>>> All,
>>> 
>>> I originally built a pcb that plugs into the GPIO of the RPi. It had
>> room for 2x FOBs (minus plastic cases) and buffers for PTT-COS. I have
>> experience with complex board design (avionics) and expected some coupling
>> from the RPi to the board, but it was significantly higher than I expected.
>> The audio always had "worms" and it was quite difficult to knock down the
>> spikes on the +5 and +3.3. The short answer is that the IO board was too
>> close and there was no simple way to get more isolation. It was also clear
>> that if there were some undesirable event on the radio, the path to Gnd was
>> via the RPi. An aside comment for now: building a system with several
>> floating ps is a really bad idea.
>>> 
>>> Over the past few months, I've shown Dave and Doug my work and received
>> comments. The NanoDB is not a bullet proof interface. Doug always argues
>> for cheap :-), but he wants the features of a more expensive unit.  The
>> NanoDB is rather minimalist in design. I had a 74HC14 buffer between the
>> inputs (COS, CTC) and the Nano, but took it out. The amount of protection
>> it offered was inadequate if there were a big event (as was re-enforced at
>> an IEEE EMI class a few months ago). The 74HC14, with jumpers, also allowed
>> the IO to invert signals to have LEDs indicate the correct state regardless
>> of COS=1 or COS=0 from the radio. I still like that idea, but it can be
>> accomplished in the Nano Sw.
>>> 
>>> What drives my designs is the desire to have no external ugly blight of
>> wires and components necessary in normal installs.  Why would anyone want a
>> design that requires external 2N2222 + bias resistors hanging in midair off
>> of a DB25?  My goal was to have the NanoDB work for 90% of the simple
>> nodes. It allows use of the potted FOB to build a cheap system.  I'd be
>> very interested to hear about cases where it did NOT work as a future rev
>> might address some issues.
>>> 
>>> I have also contemplated a more elaborate mechanical design which
>> accommodates IO for 2 radios, 2 FOBs, and integrates into a nice extruded
>> metal case with room for a pair of DB-9s on the rear. Think bigger $.  Dave
>> suggested an integrated USB HUB. Those are fine pitch parts which exclude
>> home bench soldering and small quantity builds are more expensive.  Maybe
>> someday.
>>> 
>>> I think the NanoDB will be a contribution to Allstar, which was my
>> original intent.
>>> 
>>> Barry w0iy
>>> ------------------------------
>>> 
>>> 
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>>> 
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>> 
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