WS2812 is a intelligent control LED light source that the control circuit and RGB chip are integrated in a package of 5050 components. It internal include intelligent digital port data latch and signal reshaping amplif ication drive circuit. Also include a precision internal oscillator and a 12V voltage programmable constant curre -nt control part, effectively ensuring the pixel point light color height consistent. The data transfer protocol use single NZR communication mode. After the pixel power-on reset, the DIN port receive data from controller, the first pixel collect initial 24bit data then sent to the internal data latch, the other data which reshaping by the internal signal reshaping amplification circuit sent to the next cascade pixel through the DO port. After transmission for each pixel，the signal to reduce 24bit. pixel adopt auto resha -ping transmit technology, making the pixel cascade number is not limited the signal transmission, only depend on the speed of signal transmission. LED with low driving voltage, environmental protection and energy saving, high brightness, scattering angl e is large, good consistency, low power, long life and other advantages. The control chip integrated in LED above becoming more simple circuit, small volume, convenient installation. (WS2812.pdf)

	Breadboard
	Adaptor 5V, 2A
	WS2812 White PCB 1m 30 5050 IP30
	Arduino Nano
	Resistor 330 Ohm
	Jumpers

• Put the nano on the breadboard
• Adaptor GND = ground rail
  5V => power rail
• WS2812 Green => Resistor => Arduino D2
• WS2812 Red (5V) => Power rail
• WS2812 White (GND) => GND rail
• Arduino Nano => GND rail
• Arduino Nano power:
  USB computer
  Arduino 5V => 5V rail

#include <FastLED.h>
#define LED_PIN     2
#define NUM_LEDS    30
CRGB leds[NUM_LEDS];
void setup() {
  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);
  
}
void loop() {
  leds[0] = CRGB::Red;
  FastLED.show();
  delay(500);
  leds[0] = CRGB::Black;
  FastLED.show();
  delay(500);
}

#include <FastLED.h>
#define LED_PIN     2
#define NUM_LEDS    30
#define BRIGHTNESS  255
CRGB leds[NUM_LEDS];
void setup() {
  randomSeed(analogRead(0));
  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS );
}
void loop() {
  for (int i = 0; i <= NUM_LEDS; i++) {
    leds[i] = CRGB ( 0, 0, 255);
    FastLED.show();
    delay(10);
  }

   byte r = random(3, 100);
   r=255;
   byte g = random(3, 100);
   byte b = random(3, 100);
   int d = 10;
   for (int i = NUM_LEDS; i >= 0; i--) {
    leds[i] = CRGB ( r, g, 0);
    FastLED.show();
    if (r<229) r+=10; else r=255;
    if (g<239) g+=5; else g=255;
    if (b<200) b+=20; else b=255;
    delay(d);
    d+=(2 * i);
  }
}