108个传感器之-ws2812LED（38）

介绍

一个基于 WS2812 驱动的 LED 灯带模块。

引脚连接

pin 引脚连接开发板的 gpio 接口即可：

DEV BOARD	Sensor
Pin 2	D1
5 V	4-7VDC
GND	GND

注意：如果是串联的话就是灯带 1 的 D1接灯带 2 的 D0，因为 D1 是输入口，D0 是输出口。

代码示例

通过修改 NUMPIXELS 的数量，理论可以控制无数个灯的显示状态

普通动画

#include <Arduino.h>
#include <Adafruit_NeoPixel.h>

// 控制 WS2812 灯条的引脚编号
#define PIN 2

// 定义控制的 LED 数量
#define NUMPIXELS 8

Adafruit_NeoPixel pixels(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 specifically to support the Adafruit Trinket 5V 16 MHz.
  // Any other board, you can remove 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(); // INITIALIZE NeoPixel strip object (REQUIRED)
}
// 在这里编写你的代码，控制LED灯条的亮灭和颜色
void loop()
{
	pixels.clear(); // Set all pixel colors to 'off'

	// The first NeoPixel in a strand is #0, second is 1, all the way up
	// to the count of pixels minus one.
	for (int i = 0; i < NUMPIXELS; i++)
	{
		// pixels.Color() takes RGB values, from 0,0,0 up to 255,255,255
		// Here we're using a moderately bright green color:
		pixels.setPixelColor(i, pixels.Color(150, 150, 20));
		pixels.show(); // Send the updated pixel colors to the hardware.
		delay(DELAYVAL); // Pause before next pass through loop
	}
}

彩虹条

#include <Arduino.h>
#include <Adafruit_NeoPixel.h>

#define PIN 2
#define NUMPIXELS 8

Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

void setup()
{
  pixels.begin(); 
  pixels.setBrightness(10);
  pixels.show();
}

void loop()
{
  for(long firstPixelHue = 0; firstPixelHue < 5*65536; firstPixelHue += 256) {
    pixels.rainbow(firstPixelHue);
    pixels.show();
    delay(10);  
  }
}

跑马灯

#include <Arduino.h>
#include <Adafruit_NeoPixel.h>

// 控制 WS2812 灯条的引脚编号
#define PIN 2
// 定义控制的 LED 数量
#define NUMPIXELS 8

Adafruit_NeoPixel strip(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

void setup()
{
  strip.begin();
  strip.setBrightness(10);
  strip.show(); 
}

void theaterChase(uint32_t color, int wait) {
  for(int a=0; a<10; a++) { 
    for(int b=0; b<3; b++) {
      strip.clear();         
      for(int c=b; c<strip.numPixels(); c += 3) {
        strip.setPixelColor(c, color); 
      }
      strip.show();
      delay(wait); 
    }
  }
}

void loop()
{
  theaterChase(strip.Color(255, 255, 255), 50); // White
  theaterChase(strip.Color(255,   0,   0), 50); // Red
  theaterChase(strip.Color(  0,   0, 255), 50); // Blue
}

雪花

#include <Arduino.h>
#include <Adafruit_NeoPixel.h>

// 控制 WS2812 灯条的引脚编号
#define PIN 2
// 定义控制的 LED 数量
#define NUMPIXELS 8

Adafruit_NeoPixel strip(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

void setup()
{
  strip.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
  strip.setBrightness(10); // Set BRIGHTNESS to about 4% (max = 255)
  strip.show();            // Initialize all pixels to 'off'
}

void loop()
{
  int pixel[60];
  for(int p=0; p<60; p++){
    pixel[p] = random(0,255); 
  }
  
  // Run some snowflake cycles
  for (int j=0; j<200; j++) {
    // Every five cycles, light a new pixel
    if((j%5)==0){
      strip.setPixelColor(random(0,60), 255,255,255);
    }
    
    // Dim all pixels by 10
    for(int p=0; p<60; p++){
      strip.setPixelColor(p, pixel[p],pixel[p],pixel[p] );
      pixel[p] =  pixel[p] - 10;
    }
    strip.show();
    delay(100);
  }
}

小结

待完善…