How to Control WS2812B LED Strip with Arduino

				
					#include <FastLED.h>

#define LED_PIN     19     // LED strip data pin
#define NUM_LEDS    80    // LED quantity
#define BRIGHTNESS  128   // Initial Brightness(0-255)
#define LED_TYPE    WS2812B
#define COLOR_ORDER GRB   // Most WS2812 are GRB sequential

CRGB leds[NUM_LEDS];

// Effect Mode Enumeration
enum Effects {
  EFFECT_FLOW,
  EFFECT_BLINK,
  EFFECT_MARQUEE,
  EFFECT_COUNT
};

uint8_t currentEffect = EFFECT_FLOW;
unsigned long lastEffectChange = 0;
unsigned long lastUpdate = 0;

void setup() {
  delay(3000); // Safety delay
  FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS);
  Serial.begin(115200);
}

// Full color water effect
void flowEffect() {
  static uint8_t hue = 0;
  static uint8_t pos = 0;
  
  // Gradually turn off all LEDs
  fadeToBlackBy(leds, NUM_LEDS, 10);
  
  // Set a colored light spot at the current position
  leds[pos] = CHSV(hue, 255, 255);
  
  // Move location
  pos = (pos + 1) % NUM_LEDS;
  
  // Change the hue
  hue += 3;
  
  FastLED.show();
  delay(30);
}

// Full color flashing effect
void blinkEffect() {
  static bool lightsOn = false;
  static uint8_t hue = 0;
  
  if(lightsOn) {
    // Random color of full light strip
    fill_solid(leds, NUM_LEDS, CHSV(hue, 255, 255));
    hue += 5;
  } else {
    // All off
    fill_solid(leds, NUM_LEDS, CRGB::Black);
  }
  
  lightsOn = !lightsOn;
  FastLED.show();
  delay(lightsOn ? 200 : 800); // On for 200ms, Off for 800ms
}

// Marquee effect
void marqueeEffect() {
  static uint8_t hue = 0;
  static int position = 0;
  static int tailLength = 15;
  
  // Gradual fading
  fadeToBlackBy(leds, NUM_LEDS, 20);
  
  // Create a Marquee
  leds[position] = CHSV(hue, 255, 255);
  
  // Creating a gradient tail
  for(int i = 1; i < tailLength; i++) {
    int pos = (position - i + NUM_LEDS) % NUM_LEDS;
    leds[pos] = CHSV((hue + 10*i) % 255, 255, 255 - (255/tailLength)*i);
  }
  
  position = (position + 1) % NUM_LEDS;
  hue += 2;
  
  FastLED.show();
  delay(50);
}

void loop() {
  // Switch effects every 30 seconds
  if(millis() - lastEffectChange > 30000) {
    currentEffect = (currentEffect + 1) % EFFECT_COUNT;
    lastEffectChange = millis();
    FastLED.clear();
    FastLED.show();
  }
  
  // Execute the current effect
  switch(currentEffect) {
    case EFFECT_FLOW:    flowEffect();    break;
    case EFFECT_BLINK:   blinkEffect();   break;
    case EFFECT_MARQUEE: marqueeEffect(); break;
  }
  
  // Brightness control (optional)
  // adjustBrightness();
}

// Optional: Switch effects via serial port commands
void serialEvent() {
  while(Serial.available()) {
    char c = Serial.read();
    if(c >= '0' && c <= '2') {
      currentEffect = c - '0';
      FastLED.clear();
      FastLED.show();
    }
  }
}

// Optional: Brightness adjustment function
void adjustBrightness() {
  int potValue = analogRead(A0); // Connect the potentiometer to A0
  int newBrightness = map(potValue, 0, 1023, 0, 255);
  FastLED.setBrightness(newBrightness);
}