使用 Adafruit_NeoPixel 库可以让 Arduino 或 ESP8266 很方便地驱动 WS2812 灯条。
首先附件下载这个代码库
将 WS2812 的 DIN 接到 Arduino 的 6 号引脚，再连接好 VCC 和 GND。运行下面的示例程序。
#include<Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h> //Required for 16 MHz Adafruit Trinket
#endif
// 控制 WS2812 灯条的引脚编号
#definePIN 6
//定义控制的 LED 数量
#define NUMPIXELS 16
Adafruit_NeoPixelpixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
//相邻 LED 之间的延迟，单位毫秒
#define DELAYVAL 500
void setup() {
// These lines are specificallyto support the Adafruit Trinket 5V 16 MHz.
// Any other board, you canremove this part (but no harm leaving it):
#if defined(__AVR_ATtiny85__)&& (F_CPU == 16000000)
clock_prescale_set(clock_div_1);
#endif
// END of Trinket-specific code.
pixels.begin(); // INITIALIZENeoPixel strip object (REQUIRED)
}
void loop() {
pixels.clear(); // Set all pixelcolors to 'off'
// The first NeoPixel in a strandis #0, second is 1, all the way up
// to the count of pixels minusone.
for(int i=0;i<NUMPIXELS; i++) { // For each pixel...
// pixels.Color() takes RGBvalues, from 0,0,0 up to 255,255,255
// Here we're using a moderatelybright green color:
pixels.setPixelColor(i, pixels.Color(0,150, 0));
pixels.show(); //Send the updated pixel colors to the hardware.
delay(DELAYVAL); // Pause beforenext pass through loop
