No output from MIDI shield

[belu521]

Hello teacher, I purchased a device like the one discussed at:

MIDI Shield breakout box - free pins?

Hello, I bought a MIDI breakout box in combination with and Arduino Uno R3. The Midi In and Midi Out work fine. Unfortunately I could not find any technical documentation (the board does not show any manufacturer or product name. So I could not find a documentation. Most of all I would like to find out, which pins are used by the MIDI functionality of the board, and which are potentially free to use for additional functionality (like status info or add more controls). How can I find ou…

I connected it to the UNO. When my MIDI output port is connected to an LED and a 220-ohm resistor, it flashes with the TX output signal of the UNO. However, there is no signal when I connect the MIDI output to an external device. I measured the MIDI 4th and 5th pins with a multimeter and found only 50mV. I don't know where the problem is, but I saw the discussion at MIDI Shield breakout box - free pins? and it seems like a ray of hope. Please help me, teacher.

[Grumpy_Mike]

@belu521

I connected it to the UNO.

The Uno R3 alone can't be used to generate MIDI.

We need much more information as to what you have in terms of code and schematic.

You might want to look at this How to get the best out of this forum before you proceed any further.
We only know what you tell us, and without knowing what you have, we don't stand a chance.