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| <nowiki>##</nowiki> Setup
| | [[File:Arduino to MIDI guide.pdf|thumb|PDF]] |
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| 1. Install MIDIUSB library <nowiki>https://docs.arduino.cc/libraries/midiusb/</nowiki>
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| 2. Add the MIDIUSB.h Library: Go to Tools < Manage Libraries...
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| 3. Search for "MIDIUSB" by Gary Grewal
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| 4. Install the latest version
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| 5. Select your board: Tools > Board > Arduino Leonardo (or Pro Micro)
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| 🎛️🎚️ Potentiometers / Sliders
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| <nowiki>###</nowiki> What you need:
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| - 1 potentiometer or slider
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| - 3 wires
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| <nowiki>###</nowiki> How to connect:
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| ```
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| Potentiometer:
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| ├─ Left pin / GND → GND
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| ├─ Middle pin / Signal → A0 (or A1, A2, A3...)
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| └─ Right pin / VCC / Power → 5V
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| #include <MIDIUSB.h>
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|
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| int lastValue = 0;
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| void setup() {
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| pinMode(A0, INPUT); // ← Change A0 to your pin
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| }
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| void loop() {
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| int value = analogRead(A0) / 8; // ← Change A0 to match setup
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| if (value != lastValue) {
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| midiEventPacket_t event = {0x0B, 0xB0, 1, value};
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| // ↑ ← CC number
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| MidiUSB.sendMIDI(event);
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| MidiUSB.flush();
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| lastValue = value;
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| }
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|
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| delay(10);
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| }
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| <nowiki>##</nowiki> 🔘 Note button
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| <nowiki>###</nowiki> What you need
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| - 1 push button
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| - 2 wires
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| <nowiki>###</nowiki> How to connect
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| ```
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| Button:
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| ├─ One side → Pin 2 (or 3, 4, 5...)
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| └─ Other side → GND
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| ```
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| #include <MIDIUSB.h>
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|
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| int lastState = HIGH;
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| void setup() {
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| pinMode(2, INPUT_PULLUP); // ← Change 2 to your pin
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| }
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| void loop() {
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| int state = digitalRead(2); // ← Change 2 to match setup
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| if (state != lastState) {
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| if (state == LOW) {
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| // Button pressed
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| midiEventPacket_t noteOn = {0x09, 0x90, 60, 127};
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| // ↑ ↑
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| // note velocity
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| MidiUSB.sendMIDI(noteOn);
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| } else {
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| // Button released
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| midiEventPacket_t noteOff = {0x08, 0x80, 60, 0};
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| // ↑
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| // note
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| MidiUSB.sendMIDI(noteOff);
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| }
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| MidiUSB.flush();
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| lastState = state;
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| }
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| delay(10);
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| }
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| <nowiki>###</nowiki> ☎️ 2 potmeters 2 buttons code
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| ```cpp
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| <nowiki>#</nowiki>include <MIDIUSB.h>
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| int lastValueA0 = 0;
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| int lastValueA1 = 0;
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| int lastState2 = HIGH;
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| int lastState3 = HIGH;
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| void setup() {
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| pinMode(A0, INPUT); // Pot 1
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| pinMode(A1, INPUT); // Pot 2
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| pinMode(2, INPUT_PULLUP); // Button 1
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| pinMode(3, INPUT_PULLUP); // Button 2
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| }
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| void loop() {
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| // ══════════════════════════════════════════════════════════
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| // POTENTIOMETER 1 (A0) → CC 1
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| // ══════════════════════════════════════════════════════════
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| int valueA0 = analogRead(A0) / 8;
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| if (valueA0 != lastValueA0) {
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| midiEventPacket_t event = {0x0B, 0xB0, 60, valueA0};
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| MidiUSB.sendMIDI(event);
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| MidiUSB.flush();
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| lastValueA0 = valueA0;
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| }
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|
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| // ══════════════════════════════════════════════════════════
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| // POTENTIOMETER 2 (A1) → CC 2
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| // ══════════════════════════════════════════════════════════
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| int valueA1 = analogRead(A1) / 8;
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| if (valueA1 != lastValueA1) {
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| midiEventPacket_t event = {0x0B, 0xB0, 61, valueA1};
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| MidiUSB.sendMIDI(event);
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| MidiUSB.flush();
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| lastValueA1 = valueA1;
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| }
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|
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| // ══════════════════════════════════════════════════════════
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| // BUTTON 1 (Pin 2) → Note 60 (Middle C)
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| // ══════════════════════════════════════════════════════════
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| int state2 = digitalRead(2);
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| if (state2 != lastState2) {
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| if (state2 == LOW) {
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| midiEventPacket_t noteOn = {0x09, 0x90, 60, 127};
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| MidiUSB.sendMIDI(noteOn);
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| } else {
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| midiEventPacket_t noteOff = {0x08, 0x80, 60, 0};
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| MidiUSB.sendMIDI(noteOff);
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| }
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| MidiUSB.flush();
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| lastState2 = state2;
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| }
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|
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| // ══════════════════════════════════════════════════════════
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| // BUTTON 2 (Pin 3) → Note 61 (C#)
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| // ══════════════════════════════════════════════════════════
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| int state3 = digitalRead(3);
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| if (state3 != lastState3) {
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| if (state3 == LOW) {
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| midiEventPacket_t noteOn = {0x09, 0x90, 61, 127};
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| MidiUSB.sendMIDI(noteOn);
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| } else {
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| midiEventPacket_t noteOff = {0x08, 0x80, 61, 0};
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| MidiUSB.sendMIDI(noteOff);
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| }
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| MidiUSB.flush();
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| lastState3 = state3;
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| }
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|
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| delay(10);
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| }
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| ```
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