Midi.h library, Reassigning Midi in out pin on ESP32

Projects Programming
1

Hello everyone,

I've spent quite sometime studying the codes of Pedalino Mini project on Github, trying to learn(steal) some features from it but it just didn't work as I wished. I would like to connect D18 and D19 to a Pro Micro which acts as USB Host and D4 and D15 to DIN-5 ports for physical Midi IN OUT (Yeah, just like the schematics of Pedalino Mini), but I get nothing at all on those pins :frowning:

#include <Arduino.h>
#include <MIDI.h>
#include <esp_now.h>

struct Serial1MIDISettings : public midi::DefaultSettings
{
  static const long BaudRate = 31250;
  static const int8_t RxPin  = 18;
  static const int8_t TxPin  = 19;
};

struct Serial2MIDISettings : public midi::DefaultSettings
{
  static const long BaudRate = 31250;
  static const int8_t RxPin  = 15;
  static const int8_t TxPin  = 4;
};

MIDI_CREATE_CUSTOM_INSTANCE(HardwareSerial, Serial1, USB_MIDI, Serial1MIDISettings);
MIDI_CREATE_CUSTOM_INSTANCE(HardwareSerial, Serial2, DIN_MIDI, Serial2MIDISettings);

void setup() {
  USB_MIDI.begin(MIDI_CHANNEL_OMNI);
  DIN_MIDI.begin(MIDI_CHANNEL_OMNI);
}

void loop() {
//  DIN_MIDI.read();
  DIN_MIDI.sendNoteOn(60, 127, 1);
  delay(100);
  DIN_MIDI.sendNoteOff(60, 0, 1);
  delay(100);
  USB_MIDI.sendNoteOn(60, 127, 1);
  delay(100);
  USB_MIDI.sendNoteOff(60, 0, 1);
  delay(100);
}

I have also tried using:

MIDI_CREATE_INSTANCE(HardwareSerial, Serial2, MIDI);

with the ESP32 which does give me Midi In on Pin16 but no output at all on Pin 17. I have tested the Midi In out circuit, as well as all cables with Arduino Nano and they are fine. Anyone knows how to make it work? Thank you so much

2

Solved! Didn't realize ESP32 is 3.3V, had to change the resistors of the midi circuit :smiley:

3

please give more informations about resistor changing !
i'm able to send midi message but it seems impossible to receive, using a d1-mini or esp32 with esp32softwareserial.
i tried a lot of optoisolator configuration but esp32 seems to be deaf.
using mega2560 all works fine
so i think the problem is in the resistor configuration, like for your circuit.
your help is appreciated
many thanks

1 Like
4

athlonwai:
Solved! Didn't realize ESP32 is 3.3V, had to change the resistors of the midi circuit :smiley:

@athlonwai would you be able to describe exactly what you changed and why you changed it? TY!