Hello friends, In this video you learn how to make RGB light control using RGB WS2812B LED. Color completely control from smartphone using Bluetooth. This is very easy to make. Its connection is very simple. Follow all the step and make your own amazing light effect for you room.
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/* ESP32 Bluetooth Classic RGB controller with app-configurable strip length and effects. Board: original ESP32 DevKit/WROOM with Bluetooth Classic support LED data pin: GPIO 18 Library: Adafruit NeoPixel BLUETOOTH CLASSIC ----------------- Device name: RGB LED Control Pair with the device from the app, then send commands through its existing BluetoothSocket / OutputStream. This sketch does not use BLE GATT. APP COMMAND PROTOCOL -------------------- Send the value followed by its terminator. Commands are case-insensitive. 255,0,128) Set a static RGB colour #FF0080) Set a static HTML hex colour 1] or RAINBOW] Select an effect 128} Set brightness (0 to 255) 60{ Set strip LED count (1 to 300), saved after restart 50< Set effect-frame speed in milliseconds (10 to 1000), saved ? Read the current configuration EFFECTS? Read the numbered effect list over Bluetooth Existing app commands remain compatible: RGB), effect], and brightness}. The controller replies with OK, ERR, or STATUS lines. Electrical note: Power a long 5 V LED strip from a suitable external supply, join its ground to ESP32 GND, and use a 3.3 V-to-5 V data level shifter for dependable operation. Never power a long strip from the ESP32's 5 V/USB pin. */ #include <Arduino.h> #include <Adafruit_NeoPixel.h> #include <BluetoothSerial.h> #include <Preferences.h> #if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED) #error "Bluetooth Classic is unavailable on this target. Use an original ESP32/WROOM board." #endif constexpr char BLUETOOTH_DEVICE_NAME[] = "RGB LED Control"; constexpr uint8_t LED_PIN = 18; constexpr uint16_t DEFAULT_LED_COUNT = 60; constexpr uint16_t MAX_LED_COUNT = 300; constexpr uint8_t DEFAULT_BRIGHTNESS = 180; constexpr uint16_t DEFAULT_SPEED_MS = 50; constexpr uint16_t MIN_SPEED_MS = 10; constexpr uint16_t MAX_SPEED_MS = 1000; constexpr size_t COMMAND_BUFFER_SIZE = 48; enum class Effect : uint8_t { Solid = 0, Rainbow, RainbowCycle, ColorWipe, TheaterChase, TheaterChaseRainbow, Pulse, Blink, Breathe, Fire, Twinkle, Sparkle, Scanner, Comet, Fade, Confetti, RunningLights, MeteorRain, Strobe, RandomColors, Police, Off, Aurora, OceanWave, LavaFlow, Party, Christmas, CandyCane, Matrix, GlitterRainbow, Pride, Sunrise, Sunset, Plasma, ColorBounce, Starfield, Ripple, Fireworks, Auto, Count, }; BluetoothSerial ESP_BT; Preferences preferences; Adafruit_NeoPixel strip(DEFAULT_LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800); char commandBuffer[COMMAND_BUFFER_SIZE]; size_t commandLength = 0; uint8_t heat[MAX_LED_COUNT] = {}; uint16_t ledCount = DEFAULT_LED_COUNT; uint8_t brightness = DEFAULT_BRIGHTNESS; uint16_t speedMs = DEFAULT_SPEED_MS; uint8_t red = 255; uint8_t green = 255; uint8_t blue = 255; Effect activeEffect = Effect::Solid; uint32_t effectStep = 0; uint32_t lastFrameMs = 0; uint32_t randomEffectColor = 0; uint16_t fireworkCenter = 0; uint32_t fireworkColor = 0; bool preferencesReady = false; bool isSpace(char value) { return value == ' ' || value == '\t' || value == '\r' || value == '\n'; } bool isSeparator(char value) { return value == '.' || value == ',' || value == ':' || value == ';' || value == '/'; } void sendMessage(const char *message) { Serial.println(message); ESP_BT.println(message); } const char *effectName(Effect effect) { static const char *const names[] = { "SOLID", "RAINBOW", "RAINBOW_CYCLE", "COLOR_WIPE", "THEATER_CHASE", "THEATER_CHASE_RAINBOW", "PULSE", "BLINK", "BREATHE", "FIRE", "TWINKLE", "SPARKLE", "SCANNER", "COMET", "FADE", "CONFETTI", "RUNNING_LIGHTS", "METEOR_RAIN", "STROBE", "RANDOM_COLORS", "POLICE", "OFF", "AURORA", "OCEAN_WAVE", "LAVA_FLOW", "PARTY", "CHRISTMAS", "CANDY_CANE", "MATRIX", "GLITTER_RAINBOW", "PRIDE", "SUNRISE", "SUNSET", "PLASMA", "COLOR_BOUNCE", "STARFIELD", "RIPPLE", "FIREWORKS", "AUTO" }; return names[static_cast<uint8_t>(effect)]; } void canonicalize(const char *source, char *destination, size_t destinationSize) { size_t output = 0; while (*source != '\0' && output + 1 < destinationSize) { const char value = *source++; if (value == ' ' || value == '\t' || value == '_' || value == '-') { continue; } destination[output++] = (value >= 'a' && value <= 'z') ? value - ('a' - 'A') : value; } destination[output] = '\0'; } bool parseUnsigned(const char *source, uint32_t &value) { while (isSpace(*source)) { ++source; } if (*source == '-' || *source == '\0') { return false; } char *end = nullptr; const unsigned long parsed = strtoul(source, &end, 10); if (end == source) { return false; } while (isSpace(*end)) { ++end; } if (*end != '\0') { return false; } value = static_cast<uint32_t>(parsed); return true; } bool parseRgb(const char *source, uint8_t &outRed, uint8_t &outGreen, uint8_t &outBlue) { while (isSpace(*source)) { ++source; } // Accept #RRGGBB as well as decimal RGB values. if (*source == '#') { char *end = nullptr; const unsigned long color = strtoul(source + 1, &end, 16); if (end != source + 7) { return false; } while (isSpace(*end)) { ++end; } if (*end != '\0') { return false; } outRed = static_cast<uint8_t>((color >> 16) & 0xFF); outGreen = static_cast<uint8_t>((color >> 8) & 0xFF); outBlue = static_cast<uint8_t>(color & 0xFF); return true; } // Optional friendly prefix, for example: RGB: 255, 0, 128 if ((source[0] == 'R' || source[0] == 'r') && (source[1] == 'G' || source[1] == 'g') && (source[2] == 'B' || source[2] == 'b')) { source += 3; while (isSpace(*source) || isSeparator(*source) || *source == '=') { ++source; } } uint8_t values[3]; for (uint8_t index = 0; index < 3; ++index) { while (isSpace(*source)) { ++source; } char *end = nullptr; const long parsed = strtol(source, &end, 10); if (end == source || parsed < 0 || parsed > 255) { return false; } values[index] = static_cast<uint8_t>(parsed); source = end; if (index < 2) { bool foundSeparator = false; while (isSpace(*source) || isSeparator(*source)) { foundSeparator = true; ++source; } if (!foundSeparator) { return false; } } } while (isSpace(*source)) { ++source; } if (*source != '\0') { return false; } outRed = values[0]; outGreen = values[1]; outBlue = values[2]; return true; } bool parseEffect(const char *source, Effect &effect) { uint32_t effectNumber = 0; if (parseUnsigned(source, effectNumber)) { if (effectNumber < static_cast<uint8_t>(Effect::Count)) { effect = static_cast<Effect>(effectNumber); return true; } return false; } char requestedName[COMMAND_BUFFER_SIZE]; char candidateName[COMMAND_BUFFER_SIZE]; canonicalize(source, requestedName, sizeof(requestedName)); for (uint8_t index = 0; index < static_cast<uint8_t>(Effect::Count); ++index) { canonicalize(effectName(static_cast<Effect>(index)), candidateName, sizeof(candidateName)); if (strcmp(requestedName, candidateName) == 0) { effect = static_cast<Effect>(index); return true; } } return false; } uint32_t currentColor() { return strip.Color(red, green, blue); } uint32_t scaledCurrentColor(uint8_t level) { return strip.Color( static_cast<uint8_t>((static_cast<uint16_t>(red) * level) / 255), static_cast<uint8_t>((static_cast<uint16_t>(green) * level) / 255), static_cast<uint8_t>((static_cast<uint16_t>(blue) * level) / 255) ); } uint32_t complementaryColor() { return strip.Color(255 - red, 255 - green, 255 - blue); } uint32_t prideColor(uint8_t band) { switch (band % 6) { case 0: return strip.Color(255, 0, 24); case 1: return strip.Color(255, 165, 44); case 2: return strip.Color(255, 255, 65); case 3: return strip.Color(0, 128, 24); case 4: return strip.Color(0, 0, 249); default: return strip.Color(134, 0, 125); } } uint8_t triangleWave(uint32_t step, uint16_t period) { const uint16_t position = step % period; const uint16_t halfPeriod = period / 2; if (position <= halfPeriod) { return static_cast<uint8_t>((static_cast<uint32_t>(position) * 255) / halfPeriod); } return static_cast<uint8_t>((static_cast<uint32_t>(period - position) * 255) / halfPeriod); } uint32_t heatColor(uint8_t temperature) { const uint8_t t192 = static_cast<uint8_t>((static_cast<uint16_t>(temperature) * 191) / 255); const uint8_t heatRamp = static_cast<uint8_t>((t192 & 0x3F) << 2); if (t192 > 0x80) { return strip.Color(255, 255, heatRamp); } if (t192 > 0x40) { return strip.Color(255, heatRamp, 0); } return strip.Color(heatRamp, 0, 0); } // Adafruit_NeoPixel does not provide FastLED's fadeToBlackBy(). // Fade every pixel while retaining the strip's current RGB ordering. void fadeAll(uint8_t fadeBy) { const uint8_t keep = 255 - fadeBy; for (uint16_t pixel = 0; pixel < ledCount; ++pixel) { const uint32_t color = strip.getPixelColor(pixel); const uint8_t pixelRed = static_cast<uint8_t>(((color >> 16) & 0xFF) * keep / 255); const uint8_t pixelGreen = static_cast<uint8_t>(((color >> 8) & 0xFF) * keep / 255); const uint8_t pixelBlue = static_cast<uint8_t>((color & 0xFF) * keep / 255); strip.setPixelColor(pixel, strip.Color(pixelRed, pixelGreen, pixelBlue)); } } void renderEffectFrame() { const uint16_t count = ledCount; switch (activeEffect) { case Effect::Solid: strip.fill(currentColor()); break; case Effect::Rainbow: for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint16_t hue = static_cast<uint16_t>(effectStep * 256UL + (static_cast<uint32_t>(pixel) * 65536UL) / count); strip.setPixelColor(pixel, strip.gamma32(strip.ColorHSV(hue))); } break; case Effect::RainbowCycle: for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint16_t hue = static_cast<uint16_t>((static_cast<uint32_t>(pixel) * 65536UL) / count + effectStep * 1024UL); strip.setPixelColor(pixel, strip.gamma32(strip.ColorHSV(hue))); } break; case Effect::ColorWipe: { const uint16_t position = effectStep % (count + 1); if (position == 0) { strip.clear(); } else { strip.setPixelColor(position - 1, currentColor()); } break; } case Effect::TheaterChase: { const uint8_t phase = effectStep % 3; for (uint16_t pixel = 0; pixel < count; ++pixel) { strip.setPixelColor(pixel, ((pixel + phase) % 3 == 0) ? currentColor() : 0); } break; } case Effect::TheaterChaseRainbow: { const uint8_t phase = effectStep % 3; for (uint16_t pixel = 0; pixel < count; ++pixel) { if ((pixel + phase) % 3 == 0) { const uint16_t hue = static_cast<uint16_t>(effectStep * 512UL + (static_cast<uint32_t>(pixel) * 65536UL) / count); strip.setPixelColor(pixel, strip.gamma32(strip.ColorHSV(hue))); } else { strip.setPixelColor(pixel, 0); } } break; } case Effect::Pulse: strip.fill(scaledCurrentColor(triangleWave(effectStep, 40))); break; case Effect::Blink: strip.fill(((effectStep / 8) % 2 == 0) ? currentColor() : 0); break; case Effect::Breathe: { const uint8_t wave = triangleWave(effectStep, 80); const uint8_t minimum = 12; const uint8_t level = minimum + (static_cast<uint16_t>(wave) * (255 - minimum)) / 255; strip.fill(scaledCurrentColor(level)); break; } case Effect::Fire: { const uint16_t calculatedCoolingLimit = (55 * 10 / count) + 2; const uint8_t coolingLimit = static_cast<uint8_t>(calculatedCoolingLimit > 255 ? 255 : calculatedCoolingLimit); for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint8_t cooling = random(coolingLimit); heat[pixel] = (cooling > heat[pixel]) ? 0 : heat[pixel] - cooling; } for (int pixel = count - 1; pixel >= 2; --pixel) { heat[pixel] = static_cast<uint8_t>((heat[pixel - 1] + heat[pixel - 2] + heat[pixel - 2]) / 3); } if (random(255) < 120) { const uint16_t sparkZone = count < 7 ? count : 7; const long sparkHeat = random(160, 255) + 50; heat[random(sparkZone)] = static_cast<uint8_t>(sparkHeat > 255 ? 255 : sparkHeat); } for (uint16_t pixel = 0; pixel < count; ++pixel) { strip.setPixelColor(pixel, heatColor(heat[pixel])); } break; } case Effect::Twinkle: fadeAll(40); for (uint8_t sparkle = 0; sparkle < (count < 40 ? 1 : count / 40); ++sparkle) { strip.setPixelColor(random(count), currentColor()); } break; case Effect::Sparkle: strip.clear(); strip.setPixelColor(random(count), strip.Color(255, 255, 255)); break; case Effect::Scanner: { strip.clear(); const uint16_t travel = (count > 1) ? (2 * count - 2) : 1; uint16_t position = effectStep % travel; if (position >= count) { position = travel - position; } strip.setPixelColor(position, currentColor()); if (position > 0) { strip.setPixelColor(position - 1, scaledCurrentColor(70)); } if (position + 1 < count) { strip.setPixelColor(position + 1, scaledCurrentColor(70)); } break; } case Effect::Comet: fadeAll(65); strip.setPixelColor(effectStep % count, currentColor()); break; case Effect::Fade: strip.fill(scaledCurrentColor(triangleWave(effectStep, 100))); break; case Effect::Confetti: fadeAll(32); for (uint8_t dot = 0; dot < 2; ++dot) { strip.setPixelColor(random(count), strip.gamma32(strip.ColorHSV(random(65536)))); } break; case Effect::RunningLights: for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint8_t level = triangleWave(effectStep * 3UL + (static_cast<uint32_t>(pixel) * 64UL) / count, 64); strip.setPixelColor(pixel, scaledCurrentColor(level)); } break; case Effect::MeteorRain: fadeAll(80); strip.setPixelColor(effectStep % count, currentColor()); if (random(10) == 0) { strip.setPixelColor(random(count), currentColor()); } break; case Effect::Strobe: strip.fill(((effectStep % 12) < 2) ? currentColor() : 0); break; case Effect::RandomColors: if (effectStep % 12 == 0) { randomEffectColor = strip.gamma32(strip.ColorHSV(random(65536))); } strip.fill(randomEffectColor); break; case Effect::Police: { const bool swapSides = ((effectStep / 6) % 2) != 0; const uint16_t split = count / 2; for (uint16_t pixel = 0; pixel < count; ++pixel) { const bool left = pixel < split; const bool redSide = swapSides ? !left : left; strip.setPixelColor(pixel, redSide ? strip.Color(255, 0, 0) : strip.Color(0, 0, 255)); } break; } case Effect::Aurora: for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint8_t wave = triangleWave(effectStep * 3UL + pixel * 5UL, 180); const uint16_t hue = 23500 + static_cast<uint16_t>(wave) * 35; const uint8_t value = 24 + (static_cast<uint16_t>(wave) * 210) / 255; strip.setPixelColor(pixel, strip.gamma32(strip.ColorHSV(hue, 230, value))); } break; case Effect::OceanWave: for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint8_t wave = triangleWave(effectStep * 4UL + pixel * 7UL, 160); const uint16_t hue = 30000 + static_cast<uint16_t>(wave) * 22; const uint8_t value = 35 + (static_cast<uint16_t>(wave) * 220) / 255; strip.setPixelColor(pixel, strip.gamma32(strip.ColorHSV(hue, 220, value))); } break; case Effect::LavaFlow: for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint8_t wave = triangleWave(effectStep * 3UL + pixel * 9UL, 144); const uint16_t hue = 300 + static_cast<uint16_t>(wave) * 20; const uint8_t value = 45 + (static_cast<uint16_t>(wave) * 210) / 255; strip.setPixelColor(pixel, strip.gamma32(strip.ColorHSV(hue, 255, value))); } break; case Effect::Party: for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint16_t hue = static_cast<uint16_t>(effectStep * 1800UL + (static_cast<uint32_t>(pixel) * 65536UL) / count); strip.setPixelColor(pixel, strip.gamma32(strip.ColorHSV(hue, 255, 255))); } break; case Effect::Christmas: for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint8_t stripe = (pixel + effectStep / 2) % 12; if (stripe < 5) { strip.setPixelColor(pixel, strip.Color(255, 0, 0)); } else if (stripe < 10) { strip.setPixelColor(pixel, strip.Color(0, 180, 20)); } else { strip.setPixelColor(pixel, strip.Color(255, 255, 255)); } } break; case Effect::CandyCane: for (uint16_t pixel = 0; pixel < count; ++pixel) { const bool redStripe = ((pixel + effectStep / 2) % 8) < 4; strip.setPixelColor(pixel, redStripe ? strip.Color(255, 0, 0) : strip.Color(255, 255, 255)); } break; case Effect::Matrix: fadeAll(58); for (uint8_t drop = 0; drop < (count < 40 ? 1 : count / 40); ++drop) { const uint8_t greenLevel = random(80, 256); strip.setPixelColor(random(count), strip.Color(0, greenLevel, random(10, 90))); } break; case Effect::GlitterRainbow: for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint16_t hue = static_cast<uint16_t>(effectStep * 900UL + (static_cast<uint32_t>(pixel) * 65536UL) / count); strip.setPixelColor(pixel, strip.gamma32(strip.ColorHSV(hue))); } if (random(4) == 0) { strip.setPixelColor(random(count), strip.Color(255, 255, 255)); } break; case Effect::Pride: for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint8_t band = (static_cast<uint32_t>(pixel) * 6 / count + effectStep / 10) % 6; strip.setPixelColor(pixel, prideColor(band)); } break; case Effect::Sunrise: { const uint8_t level = triangleWave(effectStep, 240); const uint8_t warmGreen = static_cast<uint8_t>((static_cast<uint16_t>(level) * 190) / 255); const uint8_t warmBlue = level > 185 ? static_cast<uint8_t>((level - 185) * 3) : 0; strip.fill(strip.Color(255, warmGreen, warmBlue)); break; } case Effect::Sunset: { const uint8_t level = triangleWave(effectStep, 240); const uint8_t warmGreen = 35 + static_cast<uint8_t>((static_cast<uint16_t>(level) * 120) / 255); const uint8_t warmBlue = static_cast<uint8_t>((static_cast<uint16_t>(level) * 75) / 255); strip.fill(strip.Color(255, warmGreen, warmBlue)); break; } case Effect::Plasma: for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint8_t wave = triangleWave(effectStep * 5UL + pixel * 7UL, 128); const uint8_t brightnessWave = triangleWave(effectStep * 3UL + pixel * 13UL, 192); const uint16_t hue = static_cast<uint16_t>(effectStep * 400UL + pixel * 1200UL + wave * 110UL); const uint8_t value = 45 + (static_cast<uint16_t>(brightnessWave) * 210) / 255; strip.setPixelColor(pixel, strip.gamma32(strip.ColorHSV(hue, 235, value))); } break; case Effect::ColorBounce: { fadeAll(88); const uint16_t travel = (count > 1) ? (2 * count - 2) : 1; uint16_t first = effectStep % travel; if (first >= count) { first = travel - first; } const uint16_t second = (first + count / 2) % count; strip.setPixelColor(first, currentColor()); strip.setPixelColor(second, complementaryColor()); break; } case Effect::Starfield: fadeAll(36); for (uint8_t star = 0; star < (count < 25 ? 1 : count / 25); ++star) { if (random(3) != 0) { const uint8_t intensity = random(110, 256); strip.setPixelColor(random(count), strip.Color(intensity, intensity, 255)); } } break; case Effect::Ripple: { const uint16_t center = (count - 1) / 2; const uint16_t rightDistance = count - 1 - center; const uint16_t maximumDistance = center > rightDistance ? center : rightDistance; const uint16_t ring = (effectStep / 2) % (maximumDistance + 1); for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint16_t distance = pixel > center ? pixel - center : center - pixel; const uint16_t delta = distance > ring ? distance - ring : ring - distance; if (delta == 0) { strip.setPixelColor(pixel, currentColor()); } else if (delta == 1) { strip.setPixelColor(pixel, scaledCurrentColor(80)); } else if (delta == 2) { strip.setPixelColor(pixel, scaledCurrentColor(25)); } else { strip.setPixelColor(pixel, 0); } } break; } case Effect::Fireworks: { const uint8_t phase = effectStep % 24; if (phase == 0) { fireworkCenter = random(count); fireworkColor = strip.gamma32(strip.ColorHSV(random(65536))); strip.clear(); } fadeAll(48); const uint16_t radius = phase / 2; for (uint16_t pixel = 0; pixel < count; ++pixel) { const uint16_t distance = pixel > fireworkCenter ? pixel - fireworkCenter : fireworkCenter - pixel; if (distance == radius) { strip.setPixelColor(pixel, fireworkColor); } } break; } case Effect::Auto: { // Change to a fresh premium palette every 120 frames. const uint8_t scene = (effectStep / 120) % 5; for (uint16_t pixel = 0; pixel < count; ++pixel) { uint16_t hue; uint8_t saturation; uint8_t value; if (scene == 0) { // Rainbow spectrum hue = static_cast<uint16_t>(effectStep * 900UL + (static_cast<uint32_t>(pixel) * 65536UL) / count); saturation = 255; value = 255; } else if (scene == 1) { // Aurora green / cyan const uint8_t wave = triangleWave(effectStep * 3UL + pixel * 5UL, 180); hue = 23500 + static_cast<uint16_t>(wave) * 35; saturation = 230; value = 24 + (static_cast<uint16_t>(wave) * 210) / 255; } else if (scene == 2) { // Deep ocean const uint8_t wave = triangleWave(effectStep * 4UL + pixel * 7UL, 160); hue = 30000 + static_cast<uint16_t>(wave) * 22; saturation = 220; value = 35 + (static_cast<uint16_t>(wave) * 220) / 255; } else if (scene == 3) { // Warm lava flow const uint8_t wave = triangleWave(effectStep * 3UL + pixel * 9UL, 144); hue = 300 + static_cast<uint16_t>(wave) * 20; saturation = 255; value = 45 + (static_cast<uint16_t>(wave) * 210) / 255; } else { // Plasma party palette const uint8_t wave = triangleWave(effectStep * 5UL + pixel * 7UL, 128); hue = static_cast<uint16_t>(effectStep * 400UL + pixel * 1200UL + wave * 110UL); saturation = 235; value = 255; } strip.setPixelColor(pixel, strip.gamma32(strip.ColorHSV(hue, saturation, value))); } break; } case Effect::Off: strip.clear(); break; case Effect::Count: break; } strip.show(); } void resetEffectState() { effectStep = 0; lastFrameMs = 0; memset(heat, 0, sizeof(heat)); randomEffectColor = currentColor(); fireworkCenter = 0; fireworkColor = currentColor(); } void applyEffect(Effect effect) { activeEffect = effect; resetEffectState(); renderEffectFrame(); } void sendStatus() { char response[112]; snprintf(response, sizeof(response), "STATUS LEDs=%u;BRIGHTNESS=%u;SPEED=%u;EFFECT=%u:%s;COLOR=%u,%u,%u", static_cast<unsigned>(ledCount), static_cast<unsigned>(brightness), static_cast<unsigned>(speedMs), static_cast<unsigned>(activeEffect), effectName(activeEffect), static_cast<unsigned>(red), static_cast<unsigned>(green), static_cast<unsigned>(blue)); sendMessage(response); } void sendEffectList() { sendMessage("EFFECTS: 0=SOLID, 1=RAINBOW, 2=RAINBOW_CYCLE, 3=COLOR_WIPE"); sendMessage("4=THEATER_CHASE, 5=THEATER_CHASE_RAINBOW, 6=PULSE, 7=BLINK"); sendMessage("8=BREATHE, 9=FIRE, 10=TWINKLE, 11=SPARKLE, 12=SCANNER"); sendMessage("13=COMET, 14=FADE, 15=CONFETTI, 16=RUNNING_LIGHTS"); sendMessage("17=METEOR_RAIN, 18=STROBE, 19=RANDOM_COLORS, 20=POLICE, 21=OFF"); sendMessage("22=AURORA, 23=OCEAN_WAVE, 24=LAVA_FLOW, 25=PARTY"); sendMessage("26=CHRISTMAS, 27=CANDY_CANE, 28=MATRIX, 29=GLITTER_RAINBOW"); sendMessage("30=PRIDE, 31=SUNRISE, 32=SUNSET, 33=PLASMA"); sendMessage("34=COLOR_BOUNCE, 35=STARFIELD, 36=RIPPLE, 37=FIREWORKS"); sendMessage("38=AUTO"); } void saveLedCount() { if (preferencesReady) { preferences.putUShort("ledCount", ledCount); } } void saveBrightness() { if (preferencesReady) { preferences.putUChar("brightness", brightness); } } void saveSpeed() { if (preferencesReady) { preferences.putUShort("speed", speedMs); } } void setLedCount(uint16_t newCount) { ledCount = newCount; strip.updateLength(ledCount); strip.setBrightness(brightness); strip.clear(); resetEffectState(); renderEffectFrame(); saveLedCount(); } void processCommand(char terminator) { commandBuffer[commandLength] = '\0'; if (terminator == '?') { char normalized[COMMAND_BUFFER_SIZE]; canonicalize(commandBuffer, normalized, sizeof(normalized)); if (strcmp(normalized, "EFFECTS") == 0 || strcmp(normalized, "LIST") == 0) { sendEffectList(); } else { sendStatus(); } commandLength = 0; return; } if (terminator == ')') { uint8_t parsedRed; uint8_t parsedGreen; uint8_t parsedBlue; if (!parseRgb(commandBuffer, parsedRed, parsedGreen, parsedBlue)) { sendMessage("ERR COLOR: use 255,0,128)"); } else { red = parsedRed; green = parsedGreen; blue = parsedBlue; applyEffect(Effect::Solid); char response[40]; snprintf(response, sizeof(response), "OK COLOR=%u,%u,%u", static_cast<unsigned>(red), static_cast<unsigned>(green), static_cast<unsigned>(blue)); sendMessage(response); } } else if (terminator == ']') { Effect requestedEffect; if (!parseEffect(commandBuffer, requestedEffect)) { sendMessage("ERR EFFECT: send 0..38] or a listed name]"); } else { applyEffect(requestedEffect); char response[48]; snprintf(response, sizeof(response), "OK EFFECT=%u:%s", static_cast<unsigned>(requestedEffect), effectName(requestedEffect)); sendMessage(response); } } else if (terminator == '}') { uint32_t value; if (!parseUnsigned(commandBuffer, value) || value > 255) { sendMessage("ERR BRIGHTNESS: use 0..255}"); } else { brightness = static_cast<uint8_t>(value); strip.setBrightness(brightness); renderEffectFrame(); saveBrightness(); char response[28]; snprintf(response, sizeof(response), "OK BRIGHTNESS=%u", static_cast<unsigned>(brightness)); sendMessage(response); } } else if (terminator == '{') { uint32_t value; if (!parseUnsigned(commandBuffer, value) || value < 1 || value > MAX_LED_COUNT) { sendMessage("ERR LEDS: use 1..300{"); } else { setLedCount(static_cast<uint16_t>(value)); char response[32]; snprintf(response, sizeof(response), "OK LEDS=%u (saved)", static_cast<unsigned>(ledCount)); sendMessage(response); } } else if (terminator == '<') { uint32_t value; if (!parseUnsigned(commandBuffer, value) || value < MIN_SPEED_MS || value > MAX_SPEED_MS) { sendMessage("ERR SPEED: use 10..1000<"); } else { speedMs = static_cast<uint16_t>(value); saveSpeed(); char response[32]; snprintf(response, sizeof(response), "OK SPEED=%u ms (saved)", static_cast<unsigned>(speedMs)); sendMessage(response); } } commandLength = 0; } void processReceivedByte(char received) { if (received == ')' || received == ']' || received == '}' || received == '{' || received == '<' || received == '?') { processCommand(received); } else if (received != '\r' && received != '\n') { if (commandLength < COMMAND_BUFFER_SIZE - 1) { commandBuffer[commandLength++] = received; } else { commandLength = 0; sendMessage("ERR: command too long"); } } } void readBluetoothCommands() { while (ESP_BT.available() > 0) { processReceivedByte(static_cast<char>(ESP_BT.read())); } } void updateEffect() { if (activeEffect == Effect::Solid || activeEffect == Effect::Off) { return; } const uint32_t now = millis(); if (now - lastFrameMs < speedMs) { return; } lastFrameMs = now; renderEffectFrame(); ++effectStep; } void loadPreferences() { preferencesReady = preferences.begin("rgb-led", false); if (!preferencesReady) { Serial.println("Preferences unavailable; using defaults."); return; } const uint16_t storedLedCount = preferences.getUShort("ledCount", DEFAULT_LED_COUNT); const uint16_t storedSpeed = preferences.getUShort("speed", DEFAULT_SPEED_MS); ledCount = (storedLedCount >= 1 && storedLedCount <= MAX_LED_COUNT) ? storedLedCount : DEFAULT_LED_COUNT; brightness = preferences.getUChar("brightness", DEFAULT_BRIGHTNESS); speedMs = (storedSpeed >= MIN_SPEED_MS && storedSpeed <= MAX_SPEED_MS) ? storedSpeed : DEFAULT_SPEED_MS; } void setup() { Serial.begin(115200); randomSeed(static_cast<uint32_t>(micros())); loadPreferences(); strip.updateLength(ledCount); strip.begin(); strip.setBrightness(brightness); strip.clear(); strip.show(); applyEffect(Effect::Solid); if (ESP_BT.begin(BLUETOOTH_DEVICE_NAME)) { Serial.printf("Bluetooth ready: %s\n", BLUETOOTH_DEVICE_NAME); } else { Serial.println("Bluetooth failed to start. Restart the ESP32."); } } void loop() { readBluetoothCommands(); updateEffect(); } |