How to Drive SK6812 RGBW Addressable Strips with Arduino

				
					#include 

// Hardware Configuration
#define LED_PIN     11      // Control pin
#define NUM_LEDS    80      // Number of LEDs
#define BRIGHTNESS  64      // Initial brightness (0-255)

Adafruit_NeoPixel strip(NUM_LEDS, LED_PIN, NEO_GRBW + NEO_KHZ800);

// Effect Parameters
uint8_t effect = 0;         // Current effect (0-2)
uint16_t speedDelay = 50;   // Effect speed (ms)
unsigned long prevMillis = 0;

void setup() {
  Serial.begin(115200);
  strip.begin();
  strip.setBrightness(BRIGHTNESS);
  strip.show(); // Turn off all LEDs after initialization

  Serial.println("Input commands to control effects:");
  Serial.println("1: Rainbow flow effect");
  Serial.println("2: Blink effect");
  Serial.println("3: Chase effect");
  Serial.println("+: Increase speed");
  Serial.println("-: Decrease speed");
}

void loop() {
  // Serial control
  if (Serial.available()) {
    char cmd = Serial.read();
    switch(cmd) {
      case '1': effect = 0; Serial.println("Rainbow flow effect"); break;
      case '2': effect = 1; Serial.println("Blink effect"); break;
      case '3': effect = 2; Serial.println("Chase effect"); break;
      case '+': speedDelay = max(20, speedDelay-10); break;
      case '-': speedDelay = min(500, speedDelay+10); break;
    }
    Serial.print("Current speed: "); Serial.println(speedDelay);
  }

  // Timed effect execution
  if (millis() - prevMillis >= speedDelay) {
    prevMillis = millis();
    
    switch(effect) {
      case 0: rainbowFlow(); break;
      case 1: blinkEffect(); break;
      case 2: chaseEffect(); break;
    }
    strip.show();
  }
}

// ================== Effect Implementations ==================
// Rainbow Flow Effect
void rainbowFlow() {
  static uint16_t hue = 0;
  for(int i=0; i<strip.numPixels(); i++) {
    // Calculate rainbow color (using RGB channels only)
    uint32_t color = strip.ColorHSV((hue + i*65536L/strip.numPixels()) % 65536);
    // Convert RGB to RGBW (keep white channel at 0)
    strip.setPixelColor(i, color);
  }
  hue += 256; // Adjust hue change speed
}

// Blink Effect
void blinkEffect() {
  static bool state = false;
  if(state) {
    // Random RGBW color
    strip.fill(strip.Color(random(256), random(256), random(256), random(256)));
  } else {
    strip.fill(0);
  }
  state = !state;
}

// Chase Effect
void chaseEffect() {
  static int pos = 0;
  strip.fill(0); // Clear all LEDs
  
  // Set current LED color (with white channel)
  strip.setPixelColor(pos, strip.Color(0, 255, 0, 100)); // RGBW: Green + White
  
  pos = (pos + 1) % strip.numPixels();
}