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Dejvino
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RP2040_Tracker.ino
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251
RP2040_Tracker.ino
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#include <SPI.h>
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#include <Wire.h>
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#include <Adafruit_GFX.h>
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#include <Adafruit_SSD1306.h>
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#include <Adafruit_NeoPixel.h>
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// --- HARDWARE CONFIGURATION ---
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#define SCREEN_WIDTH 128
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#define SCREEN_HEIGHT 64
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#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
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#define SCREEN_ADDRESS 0x3C // See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
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// Pin Definitions for Raspberry Pi Pico (RP2040)
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#define PIN_SDA 4
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#define PIN_SCL 5
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#define ENC_CLK 12
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#define ENC_DT 13
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#define ENC_SW 14
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// NeoPixel Pin (any GPIO is fine, I've chosen 16)
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#define PIN_NEOPIXEL 16
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#define NUM_PIXELS 64 // For 8x8 WS2812B matrix
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// --- TRACKER DATA ---
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#define NUM_STEPS 16
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struct Step {
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int8_t note; // MIDI Note (0-127), -1 for OFF
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};
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Step sequence[NUM_STEPS];
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// --- STATE ---
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Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
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Adafruit_NeoPixel pixels(NUM_PIXELS, PIN_NEOPIXEL, NEO_GRB + NEO_KHZ800);
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int currentStep = 0;
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bool isEditing = false;
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int scrollOffset = 0;
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// Encoder State
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volatile int encoderDelta = 0;
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static uint8_t prevNextCode = 0;
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static uint16_t store = 0;
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// Button State
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bool lastButtonState = HIGH;
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unsigned long lastDebounceTime = 0;
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// --- ENCODER INTERRUPT ---
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// Robust Rotary Encoder reading
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void readEncoder() {
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static int8_t rot_enc_table[] = {0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0};
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prevNextCode <<= 2;
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if (digitalRead(ENC_DT)) prevNextCode |= 0x02;
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if (digitalRead(ENC_CLK)) prevNextCode |= 0x01;
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prevNextCode &= 0x0f;
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// If valid state
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if (rot_enc_table[prevNextCode]) {
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store <<= 4;
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store |= prevNextCode;
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if ((store & 0xff) == 0x2b) encoderDelta--;
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if ((store & 0xff) == 0x17) encoderDelta++;
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}
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}
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void setup() {
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Serial.begin(115200);
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Serial.println(F("Starting."));
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// 1. Setup Encoder
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pinMode(ENC_CLK, INPUT_PULLUP);
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pinMode(ENC_DT, INPUT_PULLUP);
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pinMode(ENC_SW, INPUT_PULLUP);
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attachInterrupt(digitalPinToInterrupt(ENC_CLK), readEncoder, CHANGE);
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attachInterrupt(digitalPinToInterrupt(ENC_DT), readEncoder, CHANGE);
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// 2. Setup Display
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Wire.setSDA(PIN_SDA);
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Wire.setSCL(PIN_SCL);
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Wire.begin();
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// SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
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if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
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Serial.println(F("SSD1306 allocation failed"));
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for(;;); // Don't proceed, loop forever
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}
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// 3. Setup NeoPixel Matrix
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pixels.begin();
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pixels.setBrightness(40); // Set brightness to a medium-low value (0-255)
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pixels.clear();
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pixels.show();
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// 4. Init Sequence
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for(int i=0; i<NUM_STEPS; i++) {
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sequence[i].note = -1; // Default to empty
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}
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// Add a simple C-Major scale for testing
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sequence[0].note = 60; // C4
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sequence[2].note = 62; // D4
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sequence[4].note = 64; // E4
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sequence[6].note = 65; // F4
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display.clearDisplay();
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display.display();
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Serial.println(F("Started."));
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}
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void handleInput() {
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// Handle Encoder Rotation
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int delta = 0;
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noInterrupts();
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delta = encoderDelta;
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encoderDelta = 0;
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interrupts();
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if (delta != 0) {
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if (isEditing) {
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// Change Note
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int newNote = sequence[currentStep].note + delta;
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if (newNote < -1) newNote = -1;
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if (newNote > 127) newNote = 127;
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sequence[currentStep].note = newNote;
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} else {
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// Move Cursor
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currentStep += (delta > 0 ? 1 : -1);
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if (currentStep < 0) currentStep = NUM_STEPS - 1;
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if (currentStep >= NUM_STEPS) currentStep = 0;
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// Adjust Scroll to keep cursor in view
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if (currentStep < scrollOffset) scrollOffset = currentStep;
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if (currentStep >= scrollOffset + 6) scrollOffset = currentStep - 5;
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}
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}
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// Handle Button
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int reading = digitalRead(ENC_SW);
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if (reading != lastButtonState) {
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lastDebounceTime = millis();
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}
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if ((millis() - lastDebounceTime) > 50) {
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if (reading == LOW) { // Button Pressed
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// Wait for release to toggle mode
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while(digitalRead(ENC_SW) == LOW);
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isEditing = !isEditing;
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}
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}
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lastButtonState = reading;
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}
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void drawUI() {
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display.clearDisplay();
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display.setTextSize(1);
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display.setTextColor(SSD1306_WHITE);
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display.setCursor(0, 0);
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// Header
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display.print(F("TRACKER "));
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display.print(isEditing ? F("[EDIT]") : F("[NAV]"));
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display.println();
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display.drawLine(0, 8, 128, 8, SSD1306_WHITE);
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// Steps
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int y = 10;
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for (int i = scrollOffset; i < min(scrollOffset + 6, NUM_STEPS); i++) {
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// Draw Cursor
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if (i == currentStep) {
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display.fillRect(0, y, 128, 8, SSD1306_WHITE);
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display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // Invert text
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} else {
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display.setTextColor(SSD1306_WHITE);
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}
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display.setCursor(2, y);
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// Step Number
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if (i < 10) display.print(F("0"));
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display.print(i);
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display.print(F(" | "));
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// Note Value
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int n = sequence[i].note;
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if (n == -1) {
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display.print(F("---"));
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} else {
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// Basic Note to String conversion
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const char* noteNames[] = {"C-", "C#", "D-", "D#", "E-", "F-", "F#", "G-", "G#", "A-", "A#", "B-"};
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display.print(noteNames[n % 12]);
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display.print(n / 12 - 1); // Octave
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}
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y += 9;
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}
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display.display();
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}
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// Helper to convert X,Y to pixel index for an 8x8 matrix.
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// Assumes row-major wiring (NOT serpentine).
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// If your matrix is wired differently, you'll need to change this function.
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int getPixelIndex(int x, int y) {
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return y * 8 + x;
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}
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void updateLeds() {
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pixels.clear(); // Clear buffer
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for (int s = 0; s < NUM_STEPS; s++) {
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int blockX = (s % 4) * 2;
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int blockY = (s / 4) * 2;
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uint32_t color;
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if (s == currentStep) {
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if (isEditing) {
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color = pixels.Color(50, 0, 0); // Dim Red for editing
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} else {
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color = pixels.Color(40, 40, 40); // Dim White for current step
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}
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} else {
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if (sequence[s].note != -1) {
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color = pixels.Color(0, 0, 50); // Dim Blue for step with note
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} else {
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color = 0; // Off
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}
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}
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// Set the 4 pixels for the 2x2 block
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pixels.setPixelColor(getPixelIndex(blockX, blockY), color);
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pixels.setPixelColor(getPixelIndex(blockX + 1, blockY), color);
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pixels.setPixelColor(getPixelIndex(blockX, blockY + 1), color);
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pixels.setPixelColor(getPixelIndex(blockX + 1, blockY + 1), color);
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}
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pixels.show();
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}
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void loop() {
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handleInput();
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drawUI();
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updateLeds();
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delay(10); // Small delay to prevent screen tearing/excessive refresh
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}
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