MIDI controller by Teensy 3.5 was not worked !

[Makoto Takahashi]

Hello everyone, I'm Makoto.
I tried to make the MIDI controller by Teensy 3.5
(refer to this URL:https://www.pjrc.com/teensy/td_libs_MIDI.html).

I wrote the code, connect MIDI out to MIDI in on Moog synthesizer,
Although the system wasn't worked.
The circuit is as like as My_Circuit.jpg(attached).

Thanks for the help!

Makoto Takahashi

Setting:
Board:Teensy 3.5
USB type:MIDI (In future, I want to use usbMIDI - MIDI device.)
CPU speed:120 MHz

Code:

#include <MIDI.h>

const int channel = 1;

void setup() {
MIDI.begin();

Serial.begin(31250);
Serial.println("MIDI out Test");
}

void loop() {
int note;
for (note=10; note <= 127; note++) {
Serial.println(note);
MIDI.sendNoteOn(note, 100, channel);
delay(500);
MIDI.sendNoteOff(note, 100, channel);
}
delay(2000);
}

Postscript:
Should I change the circuit as like as MIDI.jpg?

 

[Revalogics]

Hi, you don't need this line.

Serial.begin(31250);

If you're using the latest Teensyduino version (1.37, as of now), you should check my post HERE.

Yours truly, Revalogics.

 

[Makoto Takahashi]

Thanks for your reply, Revalogics!

Unfortunately, I am using Teensyduino 1.36……
I will check your post.
Should I make it to Teensy 1.37 to work it reliably?


Certainly, there isn't the code( Serial.begin(31250) ) in the "MIDI
input" of the reference URL, but it is in "MIDI output test".

In the future, I also do "output" as usb MIDI-MIDI device so I thought that there is a necessity to work even if there is that code(Serial.begin(31250)).

What is the difference between having and not having that code?

 

[PaulStoffregen]

Which resistors did you use? 3.3V signals require different resistors (mentioned on the web page). 220 ohms usually only works for 5V signals.

 

[Makoto Takahashi]

Thanks for your reply,Paul.

I overlooked the web's description and used 220 ohms.

Should I change the resistor of 220 ohms on pin 4 of MIDIout to two 47 ohm resistors?

 

[PaulStoffregen]

Yes, and also the resistor on pin 5. Make them both 47 ohms.

 

[Makoto Takahashi]

I'm sorry for the late reply. I will not touch Teensy for a while for some purpose……, but I will try it.

I did MIDIout with reference to the same URL. But it didn't work. Is it because the resistance of 270 ohms was connected to 5 V instead of 3.3 V?

 

[Makoto Takahashi]

Thanks Paul and Revalogics!!
I succeeded in running the system.

I changed the resistor of 220 ohms on pin 4 and pin 5 of MIDIout to 100 ohm resistors.
I will start implementing the usbMIDI-MIDI device.