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Arduino 驱动LED样式的 WS2811

 金刚光 2020-01-17
Arduino 驱动LED样式的 WS2811

本帖最后由 Zoologist 于 2019-12-5 08:31 编辑
这种LED我好像还真有

最近入手了两种特别的 WS2811,特别之处在于这次买的是LED封装的。就是说,表面上看起来是一个LED(实际上就是LED)。

之前的WS281X都是下面这种5050封装的(4脚或者6脚)

常见的模块是下面这种直接焊接好的:

或者是滴胶封装好的

具体来说,一种是 WS2811 F5 。一种是 WS2811 F8。这两个型号的差别在于直径分别是5mm 8mm (我特地测量了一下,的确如此)。

这种LED和普通的LED的差别在于它的级联方式。比如普通的RGB LED,有4个引脚,分别是RedGreenBlueGND。如果你想出现彩色,需要给特定的引脚电源进行混色(一般都是PWM方式)。如果你有2个这样的灯,那么需要6PWM,如果你有n个这样的灯,在使用的时候就要有3n PWM来控制颜色。对于WS2811 这样的LED,级联很简单。它有一个DIN 用来接收数据,然后有一个DOUT 会将数据继续传出去。上一个LEDDOUT接到下一个的DIN即可。主控发出的数据是串行的,每个LED在接收数据的过程中它会取得最前面数据作为自己的控制,DOUT传出去其余部分。

举个例子,譬如美国总统川普要求 “严禁各级党政机关公款大吃大喝,这个精神传达给了美国省领导;认真学习重要指示之后,继续传达下去的就是严禁公款大吃大喝的精神;市级领导认真贯彻彻底领会之后,继续传达下去就是严禁大吃大喝;等到了学校级别,学校领导市级领导认真贯彻彻底领会之后要求老师就是“严禁吃喝”………

引脚定义如下(特别注意,淘宝网上的所有的介绍都是5VGND 都是反的,在正式安装之前,强烈建议你使用一个来进行单独实验):

下面就来使用 3 WS2811 (需要注意供电问题,如果灯珠足够多Arduino可能会出现带不动的情况,因为Arduino输出只有200ma。使用多个灯珠的时候一定要额外供电)

程序来自Adafruit_NeoPixel 【参考1】,这个库体积很小,使用也比较简单。

[kenrobot_code]#include "Adafruit_NeoPixel.h"
#ifdef __AVR__
#include <avr/power.h>
#endif

#define PIN 6

#define NUM_LEDS 3

#define BRIGHTNESS 50

Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, PIN, NEO_GRBW + NEO_KHZ400);

byte neopix_gamma[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2,
2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10,
10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255 };


void setup() {
// End of trinket special code
strip.setBrightness(BRIGHTNESS);
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}

void loop() {
// Some example procedures showing how to display to the pixels:
colorWipe(strip.Color(255, 0, 0), 50); // Red
colorWipe(strip.Color(0, 255, 0), 50); // Green
colorWipe(strip.Color(0, 0, 255), 50); // Blue
colorWipe(strip.Color(0, 0, 0, 255), 50); // White

whiteOverRainbow(20,75,5); 

pulseWhite(5); 

// fullWhite();
// delay(2000);

rainbowFade2White(3,3,1);


}

// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint8_t wait) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
strip.show();
delay(wait);
}
}

void pulseWhite(uint8_t wait) {
for(int j = 0; j < 256 ; j++){
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, neopix_gamma[j] ) );
}
delay(wait);
strip.show();
}

for(int j = 255; j >= 0 ; j--){
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, neopix_gamma[j] ) );
}
delay(wait);
strip.show();
}
}


void rainbowFade2White(uint8_t wait, int rainbowLoops, int whiteLoops) {
float fadeMax = 100.0;
int fadeVal = 0;
uint32_t wheelVal;
int redVal, greenVal, blueVal;

for(int k = 0 ; k < rainbowLoops ; k ++){

for(int j=0; j<256; j++) { // 5 cycles of all colors on wheel

for(int i=0; i< strip.numPixels(); i++) {

wheelVal = Wheel(((i * 256 / strip.numPixels()) + j) & 255);

redVal = red(wheelVal) * float(fadeVal/fadeMax);
greenVal = green(wheelVal) * float(fadeVal/fadeMax);
blueVal = blue(wheelVal) * float(fadeVal/fadeMax);

strip.setPixelColor( i, strip.Color( redVal, greenVal, blueVal ) );

}

//First loop, fade in!
if(k == 0 && fadeVal < fadeMax-1) {
fadeVal++;
}

//Last loop, fade out!
else if(k == rainbowLoops - 1 && j > 255 - fadeMax ){
fadeVal--;
}

strip.show();
delay(wait);
}

}



delay(500);


for(int k = 0 ; k < whiteLoops ; k ++){

for(int j = 0; j < 256 ; j++){

for(uint16_t i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, neopix_gamma[j] ) );
}
strip.show();
}

delay(2000);
for(int j = 255; j >= 0 ; j--){

for(uint16_t i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, neopix_gamma[j] ) );
}
strip.show();
}
}

delay(500);


}

void whiteOverRainbow(uint8_t wait, uint8_t whiteSpeed, uint8_t whiteLength ) {

if(whiteLength >= strip.numPixels()) whiteLength = strip.numPixels() - 1;

int head = whiteLength - 1;
int tail = 0;

int loops = 3;
int loopNum = 0;

static unsigned long lastTime = 0;


while(true){
for(int j=0; j<256; j++) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
if((i >= tail && i <= head) || (tail > head && i >= tail) || (tail > head && i <= head) ){
strip.setPixelColor(i, strip.Color(0,0,0, 255 ) );
}
else{
strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
}

}

if(millis() - lastTime > whiteSpeed) {
head++;
tail++;
if(head == strip.numPixels()){
loopNum++;
}
lastTime = millis();
}

if(loopNum == loops) return;

head%=strip.numPixels();
tail%=strip.numPixels();
strip.show();
delay(wait);
}
}

}
void fullWhite() {

for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, 255 ) );
}
strip.show();
}


// Slightly different, this makes the rainbow equally distributed throughout
void rainbowCycle(uint8_t wait) {
uint16_t i, j;

for(j=0; j<256 * 5; j++) { // 5 cycles of all colors on wheel
for(i=0; i< strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
}
strip.show();
delay(wait);
}
}

void rainbow(uint8_t wait) {
uint16_t i, j;

for(j=0; j<256; j++) {
for(i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel((i+j) & 255));
}
strip.show();
delay(wait);
}
}

// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
WheelPos = 255 - WheelPos;
if(WheelPos < 85) {
return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3,0);
}
if(WheelPos < 170) {
WheelPos -= 85;
return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3,0);
}
WheelPos -= 170;
return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0,0);
}

uint8_t red(uint32_t c) {
return (c >> 16);
}
uint8_t green(uint32_t c) {
return (c >> 8);
}
uint8_t blue(uint32_t c) {
return (c);
}
[/kenrobot_code]

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