Need help MIDI Out from Arduino

Using Arduino Audio
1

Hi guys

so my schematic is pretty simple for the MIDI Out; basically it's the standard setup as shown here:

In fact, when I plug in to the M-audio UNO MIDI interface, I do indeed receive the incoming MIDI data from the arduino (the MIDI IN LED lights up when I change values from the arduino).

However, when I try to hook it up with Reaper in my computer, it's not communicating at all. I've checked that the MIDI interface is not the case because it worked when I hooked it up with a MIDI controller keyboard. However, I did noticed that when I hooked it up with the keyboard, the MIDI IN LED kept turning on and off continuesly, where as with the arduino, it only lights up when I change a MIDI note number.

I did not used the MIDI library that the arduino has. Instead, I've modified from another source. Basically this is what is sending out from the Arduino:

void ProcessMIDIOut(byte cmdtype, byte val1, byte val2)
{
  
 //bugging test purposes: to see what values the TX pin is sending out.
  SSerial.print("?x00?y2");
  if (cmdtype == PITCHBEND)
  {
    Serial.print(0xE0 | (channel & 0xf));            //  control change command ***Error here:: "As of Arduino 1.0 the "BYTE" keyword is no longer supported. Please use Serial.write () instead
    Serial.print(val1 & 0x7f);                       //  pb MSB 0-127
    Serial.print(val2);                              //  pb LSB 0-15 - TODO
  }
  else // All standard note and cc messages
  {
    Serial.print(cmdtype | (output_channel & 0xf));  //  control change command
    Serial.print(val1);                           //  command
    Serial.print(val2 & 0x7f);                       //  val1 0-127

So for instance, when I call out the function:

ProcessMIDIOut(144, 86, 100)

Would that be enough to communicate with the computer?

I know that these are the values that are sending since I've hooked an LCD to display it

2

Please all of your sketch.

Did you use : Serial.begin(31250); in the setup part ?

It's better to use midi with diode and an optocoupler to protect arduino from other equipment like the midi in from this schematic.

3

I've taken consideration on the MIDI IN as you suggessted. Right now, I'm focused on the MIDI OUT

Yes, I set the baud rate 31250

here's the code: https://docs.google.com/document/d/1VpcNgb8phVN_fRRYdFNwo6l-9kQLV7_ToV_rvBiVrQU/edit

4

ok !

Try to change of the midi send command that are actually Serial.print(...) with Serial.write(...)

Come back to tell us if it changes something.

5

It worked!!
Yep, that was all it was needed. Just change from print to write.

Thank you so much!!

6

Allright now I'm difficulties with sending CC messages:

I am sending as so:

ProcessMIDIOut(176,12,xx) where xx-values that can be changed from incoming voltage

is this the right format for sending out CC messages? I want the arduino to act as MIDI controller

7

look at this table that shows a lot of midi messages.

You will learn that 176 is not an valid CC message...

Hope it cans help you.

8

You will learn that 176 is not an valid CC message...

176 is the bit pattern 10110000 which is a Control Change on MIDI channel 0.

Pete