cv-to-MIDI for Grains

Inspired by the GRAINS "Midi out" module and a post from NightMachines I created a little module which converts CV input to MIDI note and velocity values.

CV is sent to IN1 and IN2 and gate to input "A". I used the Arduino MIDI library and the "Hairless MIDI<->Serial Bridge" software which is also described in the README.md of the "Midi out" module.


I didn't use the "GrainsIO" class. And I didn't use interrupts. So the code is rather simple and could probably be more elegant or efficient.
#include <MIDI.h>

MIDI_CREATE_DEFAULT_INSTANCE();

void setup() {
 pinMode(A1, INPUT); // IN2 / Pot2 -> used for velocity
 pinMode(A2, INPUT); // IN1 / Pot1 -> used for pitch
 pinMode(A4, INPUT); // A -> used to detect gate

 // Initialization as described on the "Hairless MIDI<->Serial Bridge" page
 // https://projectgus.github.io/hairless-midiserial/
 // (section "How do I use the Arduino MIDI Library?")
 MIDI.begin();
 Serial.begin(115200);
}

boolean gate = false;
boolean oldgate = false;
byte note = 0;
byte midiport = 1;

void loop() {
 // Check for gate on GRAINS input "A" (Arduino Pin A4):
 // "analogRead()" returns values between 0 and 1023.
 // If the value is bigger than 512, this is considered as "gate on"
 gate = analogRead(A4) > 512;

 // React only if the state of input "A" changed
 if (oldgate != gate) {
   if (gate) {
     // Input on IN1 is mapped to a value between 0 and 127 for MIDI note value
     note = map(analogRead(A2), 0, 1023, 0, 127);

     // Input on IN2 is mapped to a value between 0 and 127 for MIDI velocity value
     MIDI.sendNoteOn(note, map(analogRead(A1), 0, 1023, 0, 127), midiport);
   } else {
     // Send noteOff for the note that was
     MIDI.sendNoteOff(note, 0, midiport);
   }
   oldgate = gate;
 }
}




I made a short video where I sent gate and cv information from SEQ8 to the GRAINS cv-to-MIDI module:


I connected GRAINS with a USB cable to my laptop. I started VCV Rack 2 and loopMidi and the "Hairless MIDI<->Serial Bridge". You can find some more information about this on the Hairless MIDI<->Serial Bridge website.

The VCV Rack 2 patch is the default template. I just rearranged the modules to fit in one row. I used the loopMidi port as an input port. I used the "VEL" (velocity) output not as velocity information, but to change the value of the resonance of the VCV filter.

After I watched my video myself I thought that this is maybe more confusing than helpful. Let me know if you have questions or remarks.
I will upload the code to Github soon