Arduino Forum

Using Arduino => Audio => Topic started by: labouras on Jan 03, 2013, 03:43 pm

Title: Midi Din powered arduino
Post by: labouras on Jan 03, 2013, 03:43 pm
Hello everyone, it is possible to use power from midi 5-DIN devices to run one atmega?

the ideia is, conect a midicontroller(atmega) to a line6 pod, without an extra powersuply
Title: Re: Midi Din powered arduino
Post by: johnwasser on Jan 03, 2013, 04:10 pm
I don't see any power connections on the MIDI connectors:

http://www.midi.org/techspecs/electrispec.php

The current loop signal is specified as 5 mA so I don't think you can draw enough from the data lines to run an Arduino.
Title: Re: Midi Din powered arduino
Post by: DirtBiker on Jan 05, 2013, 03:44 pm
As far as I know there is no standard way of supplying power over Midi.  My guess is you want to reduce the cable clutter going out the the stage.

If they were going to supply power over the Midi cable, it would likely be done on pins 1 and 3.  You could use a multi-meter to test those.  I have done this in the past myself.

I have also seen people use 1 and 2, or even 3 and 2, using the shield as the ground for the power.  I personally do not like this idea, but who am I to comment on what others do.

If there is no power delivered via any of the above methods, and you have the right expertise, you could modify the POD to deliver power over pins 1 and 3.  You would need to make sure of a few things though.



Failing your willingness to do that (and I don't blame you) Rocktron make a device (the RDMH900) that uses a 7 pin cable system that can be used to do this for some of their equipment.  Check it out here http://www.rocktron.com/products/accessories/midicable5to7pin/ (http://www.rocktron.com/products/accessories/midicable5to7pin/).  It would probably be easier to modify that, or build something similar with 5-pin DIN and female power connectors at one end and 5-pin DIN and male power connectors at the other end.

The final suggestion would be to just tape a power extension cable to your midi cable so that they are basically just the one cable.
Title: Re: Midi Din powered arduino
Post by: charonme on Mar 10, 2014, 05:10 pm
this (http://wiki.openmusiclabs.com/wiki/MidiVamp2?action=AttachFile&do=view&target=vamp2_sch.png) is a tiny synth powered by MIDI

here is a KVR audio thread (http://www.kvraudio.com/forum/viewtopic.php?p=5292691) on this topic