Hello,
I have been building custom MIDI controllers for my music setup (guitars and keyboards) using the UNO and MEGA for months. I found out a DUE with TFT shield and a 7" touch display that I have never used, and while testing it the programming port broke so it is useless ( stuck in the UTFT demo), and the pins are too small for me to solder a new port on them.
I really like the way the DUE is behaving with the 7" touchpad so I was wondering if I can use this setup for MIDI applications. I would need it to run UTFT(working), DueGUI, and Arduino MIDI Library v4.0 beta from Forty Seven Effects. After some googling I found out that I should not have any problems with those libraries and the DUE. However, the DUE is 3.3V, and I cannot find the Voltage MIDI requires even in the official MIDI electrical specifications page...or a schematic for DUE and MIDI.
Should I buy a new DUE for this kind of applications, or will I have problems with the voltages? Any thoughts are welcome.
Thank you
Nicholas
MIDI does not have a voltage requirement as such it is a current loop standard.
However the voltage and current output of the Due is such that it can not drive a normal MIDI output so you need a buffer of some sorts. This needs to be non inverting so use either an IC or simply two transistors.
I can post a schematic of this if you like when I am not on my iPad.
Thank you Grumpy_Mike, I would really like a schematic for the MIDI OUT(for both IC and transistors maybe?) !
And what about a MIDI IN?
By the way I found DUE compatibles for as low as 10pounds on the british ebay
http://www.ebay.co.uk/itm/DUE-2012-R3-Board-AT91SAM3X8E-ARM-32-Bit-Turmeric-Arduino-w-Data-Line-Cable-NEW-/281331853784?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item4180af69d8
would these work or are they just junk?
OK I have only the transistor one on hand so I have attached that one.
And what about a MIDI IN?
That is through an opto isolator so you just use the standard circuit and pull up to 3V3 rather than 5V
http://www.thebox.myzen.co.uk/Hardware/MIDI_Shield.html
That link looks like it could be a rip off clone. All the markings look genuine but the price does not. You never know if what you get will match the pictures.
DUE - MIDI.pdf (17 KB)
Thanks again Mike, very helpful!!!