MIDI controller with Arduino UNO

Projects Programming
1

I try to make a MIDI controller and use Arduino UNO, with 3 Arcade quality 24mm Push buttons, 3 pots and 2 slider. But it got some error and pop out when use pots or slider While use hairless MIDI. Is the circuit problem or code ? I use Ableton to Mapping the button/pots/slider but no response and sound.

#include <MIDI.h>
MIDI_CREATE_DEFAULT_INSTANCE();

const int buttonPins[] = {2, 3, 4}; 
byte buttonState[3] = {0, 0, 0}; 
const int buttonPitches[] = {36, 37, 38}; 

const int sliderPins[] = {A4, A5}; 
int sliderValues[2] = {0, 0}; 

const int knobPins[] = {A0, A1, A2}; 
int knobValues[3] = {0, 0, 0}; 

void setup() {
  MIDI.begin(); 
 
  for (int i = 0; i < 3; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }

  
  for (int i = 0; i < 2; i++) {
    pinMode(sliderPins[i], INPUT);
  }

  
  for (int i = 0; i < 3; i++) {
    pinMode(knobPins[i], INPUT);
  }
}

void loop() {
 
  for (int i = 0; i < 3; i++) {
    byte tempRead = digitalRead(buttonPins[i]); 
    if (tempRead != buttonState[i]) {
      buttonState[i] = tempRead; 
      int note = buttonPitches[i]; 
      if ((buttonState[i] == LOW)) {
        MIDI.sendNoteOn(note, 127, 1); 
      } else { 
        MIDI.sendNoteOff(note, 0, 1);
      }
    }
  }

  
  for (int i = 0; i < 2; i++) {
    int value = analogRead(sliderPins[i]); 
    if (abs(value - sliderValues[i]) > 2) { 
      sliderValues[i] = value; 
      int controller = 16 + i;
      int data = map(value, 0, 1023, 0, 127);
      MIDI.sendControlChange(controller, data, 1); 
    }
  }

 
  for (int i = 0; i < 3; i++) {
    int value = analogRead(knobPins[i]);
    if (abs(value - knobValues[i]) > 2) { 
      knobValues[i] = value;
      int controller = i;
      int data = map(value, 0, 1023, 0, 127);       
      MIDI.sendControlChange(controller, data, 1); 
    }
  }
}
2

Check the baud rate in Hairless. Set it to (at least) 115200, and add Serial.begin(115200) at the end of your setup() function to override the MIDI library's default rate of 31250 baud.

3

I added Serial.begin(115200) to my code and set the Baud rate to 115200. It's no error but no response when push buttons or pots or slider. what wrong?