Thanks, Martin and Paul!

The Teensy is great but seems to need some extra electronics since it is
operating at 3.3V in order to get a reliable MIDI In/Out with 5V (according
to a friend who is also working on something like this).
The Arduinos with 5V should be easier. Of course for more complex stuff the
Teensy with 3 serial ports has a lot more power.

I kind of suspected the Nano (or the older Arduinos) not to work - good to
know now!

Ingo

________________________________________
Von: Paul Batchelor [mailto:ralphbluecoat@gmail.com]
Gesendet: Samstag, 20. Juni 2015 17:39
An: Martin Peach
Cc: Ingo; pd-list@lists.iem.at
Betreff: Re: [PD] Arduiano (Micro or Nano) as MIDI interface?

I would definitely consider the Teensy unless there are specific reasons for
the Arduino. The newest version has MIDI support built into and it is
compatible with Arduino sketches. 

On Sat, Jun 20, 2015 at 11:11 AM, Martin Peach <chakekatzil@gmail.com>
wrote:
On Sat, Jun 20, 2015 at 6:06 AM, Ingo <ingo@miamiwave.com> wrote:
Hi there!

I'd like to use an Arduino Micro (or Nano) as a MIDI interface connecting
the MIDI ports to the digital pins "0" and "1" (TX/RX) and receiving the
MIDI data via USB in Pd.
It does not matter in which format it comes into Pd (i.e. it doesn't have to
show up as a MIDI port - like MIDI over USB).

1) Does anybody know if there is an existing arduino software for this?

No but all you need to do is
  if (Serial.available()) Serial1.write(Serial.read());
  if (Serial1.available()) Serial.write(Serial1.read());
in your main loop, where Serial1 is the TTL serial and Serial is USB.

 
2) Does anybody know if there are limitations on some or even all arduinos
using the serial (digatal 0/1) ports and USB port at the same time?

Only the micro (or Leonardo or Mega) will work for this as the TTL serial is
separate from the USB. The TTL serial port on pins 0 and 1 shoud be set to
31250 baud. Arduinos that use the Atmega168 or 328 use the same serial port
for TTL and USB so there will be conflicts if you try to do both at the same
time. And software serial is probably too slow to receive at 31250 baud
although it can work to send MIDI that way. 
Teensy2.0 (http://www.pjrc.com/teensy/index.html) will also work for this
and can also (I believe) be set up as a USB MIDI device.

Martin

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