【花雕动手做】有趣好玩的音乐可视化系列小项目（22）--LED无限魔方
2024-05-11 10:14:44
偶然心血来潮，想要做一个音乐可视化的系列专题。这个专题的难度有点高，涉及面也比较广泛，相关的FFT和FHT等算法也相当复杂，不过还是打算从最简单的开始，实际动手做做试验，耐心尝试一下各种方案，逐步积累些有用的音乐频谱可视化的资料，也会争取成型一些实用好玩的音乐可视器项目。
LED无限魔方的英文是LED Infinity Cube，还有一种称呼，叫做超级立方体，大概说的都是一种三维或多维镜像LED灯。正好手头有六片有机玻璃板，这里准备从小规格的开始尝试，先做一款10X10厘米的特别迷你型，感觉有点难度，试试看。
找到一张软镜子贴纸
立方体的底面，使用这个
超薄的玻璃贴膜
其余五个面，使用这个银灰膜
贴膜手艺有所提高
立方体的六个面备好了
声音模块，使用性价比更高的MAX4466声音传感器。
MAX4466
是微功率运算放大器，经过优化，可用作麦克风前置放大器。它们提供了优化的增益带宽产品与电源电流的理想组合，以及超小型封装中实现低电压工件环境。 MAX4466具有增益稳定特性，仅需24μA的电源电流即可提供200kHz的增益带宽。经过解压缩，可实现+5V/V的最小稳定增益，并提供600KHZ增益带宽。此外这些放大器具有轨到轨输出，高 AVOL ，以及出色的电源抑制和共模抑制比，适合在嘈杂环境中工作。广泛应用于蜂窝电话、数字复读装置、耳机、助听器、麦克风前置放大器、便携计算机和语音识别系统中。
MAX4466模块特点
电源电压：+2.4V至+5.5V（可直接接STM/ARDUNIO/树莓派等开发板）
电源抑制比：112dB
共模抑制比：126dB
AVOL：125dB（RL = 100kΩ) 轨到轨输出
静态电源电流：24μA
增益带宽：600kHz
尺寸：20.8mm x 13.8mm x 7.5mm/0.8 x 0.5 x 0.3inch
该模块在 Vcc 和接地引线上都包含铁氧体，以最大限度地减少电源噪声。如果与 MCU 一起使用，最好使用 2.4V – 5.5V 范围内可用的最安静的电源。在 Arduino 上，这通常是 3.3V 电源。输出是直流耦合的。当输出信号处于静止状态时，它将位于 Vcc/2。如果 Vcc 为 5V，则输出将为 2.5V。如果输出需要交流耦合，可以在输出引脚和它驱动的电路的输入之间增加一个100uF的电容。背面的小型单圈电位器可让您将增益从 25x 调整到 125x。逆时针旋转电位器会增加增益，而逆时针旋转会降低增益。
WS2812B灯带选用的是每米60灯黑底裸板
WS2812B灯带电原理图
WS2812B是集控制电路和发光电路于一体的LED光源元件，其控制IC为WS2812B，发光元件是5050RGBLED，电压为5V，每个单位的峰值电流为60ma，灯带为三线制，VCC GND DIN分别为电源+、电源-、信号，当使用外部电源时，外部电源-需要与单片机的GND相连。
定制的小木条到了，这活好像有点难度…
开始组装无限魔方
【花雕动手做】有趣好玩的音乐可视化系列小项目（22）–LED无限魔方
项目程序之一：循环LED绿色LED快闪测试
/*【花雕动手做】有趣好玩的音乐可视化系列小项目（22）--LED无限魔方项目程序之一：循环LED绿色LED快闪测试
*/#include <Adafruit_NeoPixel.h>#define PIN 6
#define MAX_LED 35#define ADD true
#define SUB falseint val = 0;
boolean stat = ADD;Adafruit_NeoPixel strip = Adafruit_NeoPixel( MAX_LED, PIN, NEO_RGB + NEO_KHZ800 );void setup() {strip.begin();strip.show();
}void loop() {uint8_t i, a = 0;uint32_t color = strip.Color(255, 0, 0);while (a < 36){for (i = 0; i < 35; i++){if (i == a) strip.setPixelColor(i, color);else strip.setPixelColor(i, 0);}strip.show();delay(100);a++;}
}
测试已安装的一部分
实验场景图 动态图
许多失败，差点就放弃了，多方折腾后来勉强点亮…
【花雕动手做】有趣好玩的音乐可视化系列小项目（22）–LED无限魔方
项目程序之二：NeoPixel Ring 绿色柱灯
/*【花雕动手做】有趣好玩的音乐可视化系列小项目（22）--LED无限魔方项目程序之二：NeoPixel Ring 绿色柱灯
*/#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif// Which pin on the Arduino is connected to the NeoPixels?
#define PIN 6 // On Trinket or Gemma, suggest changing this to 1// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS 60 // Popular NeoPixel ring size// When setting up the NeoPixel library, we tell it how many pixels,
// and which pin to use to send signals. Note that for older NeoPixel
// strips you might need to change the third parameter -- see the
// strandtest example for more information on possible values.
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);#define DELAYVAL 500 // Time (in milliseconds) to pause between pixelsvoid 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)
}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++) { // For each pixel...// 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(0, 250, 0));pixels.show(); // Send the updated pixel colors to the hardware.delay(100); // Pause before next pass through loop}
}
实验的视频记录（1分02秒）
https://v.youku.com/v_show/id_XNTkwMDM4ODA0NA==.html?spm=a2hcb.playlsit.page.1
实验场景图 动态图
【花雕动手做】有趣好玩的音乐可视化系列小项目（22）–LED无限魔方
项目程序之三：NeoPixel 测试程序
/*【花雕动手做】有趣好玩的音乐可视化系列小项目（22）--LED无限魔方项目程序之三：NeoPixel 测试程序
*/#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif// Which pin on the Arduino is connected to the NeoPixels?
// On a Trinket or Gemma we suggest changing this to 1:
#define LED_PIN 6// How many NeoPixels are attached to the Arduino?
#define LED_COUNT 60// Declare our NeoPixel strip object:
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
// Argument 1 = Number of pixels in NeoPixel strip
// Argument 2 = Arduino pin number (most are valid)
// Argument 3 = Pixel type flags, add together as needed:
// NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
// NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
// NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products)
// NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
// NEO_RGBW Pixels are wired for RGBW bitstream (NeoPixel RGBW products)// setup() function -- runs once at startup --------------------------------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.strip.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)strip.show(); // Turn OFF all pixels ASAPstrip.setBrightness(50); // Set BRIGHTNESS to about 1/5 (max = 255)
}// loop() function -- runs repeatedly as long as board is on ---------------void loop() {// Fill along the length of the strip in various colors...colorWipe(strip.Color(255, 0, 0), 50); // RedcolorWipe(strip.Color( 0, 255, 0), 50); // GreencolorWipe(strip.Color( 0, 0, 255), 50); // Blue// Do a theater marquee effect in various colors...theaterChase(strip.Color(127, 127, 127), 50); // White, half brightnesstheaterChase(strip.Color(127, 0, 0), 50); // Red, half brightnesstheaterChase(strip.Color( 0, 0, 127), 50); // Blue, half brightnessrainbow(10); // Flowing rainbow cycle along the whole striptheaterChaseRainbow(50); // Rainbow-enhanced theaterChase variant
}// Some functions of our own for creating animated effects -----------------// Fill strip pixels one after another with a color. Strip is NOT cleared
// first; anything there will be covered pixel by pixel. Pass in color
// (as a single 'packed' 32-bit value, which you can get by calling
// strip.Color(red, green, blue) as shown in the loop() function above),
// and a delay time (in milliseconds) between pixels.
void colorWipe(uint32_t color, int wait) {for (int i = 0; i < strip.numPixels(); i++) { // For each pixel in strip...strip.setPixelColor(i, color); // Set pixel's color (in RAM)strip.show(); // Update strip to matchdelay(wait); // Pause for a moment}
}// Theater-marquee-style chasing lights. Pass in a color (32-bit value,
// a la strip.Color(r,g,b) as mentioned above), and a delay time (in ms)
// between frames.
void theaterChase(uint32_t color, int wait) {for (int a = 0; a < 10; a++) { // Repeat 10 times...for (int b = 0; b < 3; b++) { // 'b' counts from 0 to 2...strip.clear(); // Set all pixels in RAM to 0 (off)// 'c' counts up from 'b' to end of strip in steps of 3...for (int c = b; c < strip.numPixels(); c += 3) {strip.setPixelColor(c, color); // Set pixel 'c' to value 'color'}strip.show(); // Update strip with new contentsdelay(wait); // Pause for a moment}}
}// Rainbow cycle along whole strip. Pass delay time (in ms) between frames.
void rainbow(int wait) {// Hue of first pixel runs 5 complete loops through the color wheel.// Color wheel has a range of 65536 but it's OK if we roll over, so// just count from 0 to 5*65536. Adding 256 to firstPixelHue each time// means we'll make 5*65536/256 = 1280 passes through this outer loop:for (long firstPixelHue = 0; firstPixelHue < 5 * 65536; firstPixelHue += 256) {for (int i = 0; i < strip.numPixels(); i++) { // For each pixel in strip...// Offset pixel hue by an amount to make one full revolution of the// color wheel (range of 65536) along the length of the strip// (strip.numPixels() steps):int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels());// strip.ColorHSV() can take 1 or 3 arguments: a hue (0 to 65535) or// optionally add saturation and value (brightness) (each 0 to 255).// Here we're using just the single-argument hue variant. The result// is passed through strip.gamma32() to provide 'truer' colors// before assigning to each pixel:strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));}strip.show(); // Update strip with new contentsdelay(wait); // Pause for a moment}
}// Rainbow-enhanced theater marquee. Pass delay time (in ms) between frames.
void theaterChaseRainbow(int wait) {int firstPixelHue = 0; // First pixel starts at red (hue 0)for (int a = 0; a < 30; a++) { // Repeat 30 times...for (int b = 0; b < 3; b++) { // 'b' counts from 0 to 2...strip.clear(); // Set all pixels in RAM to 0 (off)// 'c' counts up from 'b' to end of strip in increments of 3...for (int c = b; c < strip.numPixels(); c += 3) {// hue of pixel 'c' is offset by an amount to make one full// revolution of the color wheel (range 65536) along the length// of the strip (strip.numPixels() steps):int hue = firstPixelHue + c * 65536L / strip.numPixels();uint32_t color = strip.gamma32(strip.ColorHSV(hue)); // hue -> RGBstrip.setPixelColor(c, color); // Set pixel 'c' to value 'color'}strip.show(); // Update strip with new contentsdelay(wait); // Pause for a momentfirstPixelHue += 65536 / 90; // One cycle of color wheel over 90 frames}}
}
实验场景图 动态图
实验的视频记录（1分29秒）
https://v.youku.com/v_show/id_XNTkwMDY1MjQ3Ng==.html?spm=a2hcb.playlsit.page.1
【花雕动手做】有趣好玩的音乐可视化系列小项目（22）–LED无限魔方
项目程序之四：音乐反应LED无限魔方
模块接线：WS2812B接D6
MAX4466 UNO
VCC 5V
GND GND
OUT A0
/*【花雕动手做】有趣好玩的音乐可视化系列小项目（22）--LED无限魔方项目程序之四：音乐反应LED无限魔方模块接线：WS2812B接D6MAX4466 UNOVCC 5VGND GNDOUT A0
*/#include<FastLED.h>
#define LED_PIN 6
#define NUM_LEDS 60CRGB leds[NUM_LEDS];
uint8_t hue = 0;
int soundsensor = A0;void setup() {delay(2000);FastLED.addLeds<WS2812B, LED_PIN, GRB>(leds, NUM_LEDS);FastLED.setBrightness(155);pinMode(soundsensor, INPUT);
}void loop() {int sensval = digitalRead(soundsensor);if (sensval == 1) {leds[0] = CRGB :: Red;fill_solid(leds, NUM_LEDS, CRGB :: Blue);rainbow_moving();FastLED.show();delay(10);}else {leds[0] = CRGB :: Black;fill_solid(leds, NUM_LEDS, CRGB :: Black);FastLED.show();delay(10);}
}void rainbow_moving() {for (int i = 0; i < NUM_LEDS; i++) {leds[i] = CHSV(hue + (i * 10), 255, 255);}EVERY_N_MILLISECONDS(10) {hue++;}
}
实验场景图 动态图
实验的视频记录（2分51秒）
https://v.youku.com/v_show/id_XNTkwMDc0ODcxMg==.html?spm=a2hcb.playlsit.page.1
【花雕动手做】有趣好玩的音乐可视化系列小项目（22）–LED无限魔方
项目程序之五：多彩MegunoLink音乐节拍灯
模块接线：WS2812B接D6
MAX4466 UNO
VCC 5V
GND GND
OUT A0
/*【花雕动手做】有趣好玩的音乐可视化系列小项目（22）--LED无限魔方项目程序之五：多彩MegunoLink音乐节拍灯模块接线：WS2812B接D6MAX4466 UNOVCC 5VGND GNDOUT A0
*/#include<FastLED.h>
#include<MegunoLink.h>
#include<Filter.h>#define N_PIXELS 60
#define MIC_PIN A0
#define LED_PIN 6
#define NOISE 10
#define TOP (N_PIXELS+2)
#define LED_TYPE WS2811
#define BRIGHTNESS 10
#define COLOR_ORDER GRBCRGB leds[N_PIXELS];
int lvl = 0, minLvl = 0, maxLvl = 10;ExponentialFilter<long> ADCFilter(5, 0);void setup() {FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, N_PIXELS).setCorrection(TypicalLEDStrip);FastLED.setBrightness(BRIGHTNESS);
}void loop() {int n, height;n = analogRead(MIC_PIN);n = abs(1023 - n);n = (n <= NOISE) ? 0 : abs(n - NOISE);ADCFilter.Filter(n);lvl = ADCFilter.Current();// Serial.print(n);// Serial.print(" ");// Serial.println(lvl);height = TOP * (lvl - minLvl) / (long)(maxLvl - minLvl);if (height < 0L) height = 0;else if (height > TOP) height = TOP;for (uint8_t i = 0; i < N_PIXELS; i++) {if (i >= height) leds[i] = CRGB(0, 0, 0);else leds[i] = Wheel( map( i, 0, N_PIXELS - 1, 30, 150 ) );}FastLED.show();
}CRGB Wheel(byte WheelPos) {if (WheelPos < 85)return CRGB(WheelPos * 3, 255 - WheelPos * 3, 0);else if (WheelPos < 170) {WheelPos -= 85;return CRGB(255 - WheelPos * 3, 0, WheelPos * 3);} else {WheelPos -= 170;return CRGB(0, WheelPos * 3, 255 - WheelPos * 3);}
}
实验的视频记录（4分50秒）
https://v.youku.com/v_show/id_XNTkwMDgzNDUwMA==.html?spm=a2hcb.playlsit.page.1
实验场景图
实验的视频记录
https://v.youku.com/v_show/id_XNTkwMDgzNDc1Ng==.html?spm=a2hcb.playlsit.page.1
参考LED序列
【花雕动手做】有趣好玩的音乐可视化系列小项目（22）–LED无限魔方
项目程序之六：一个用 FastLED 编程的LED无限魔方体
/*【花雕动手做】有趣好玩的音乐可视化系列小项目（22）--LED无限魔方项目程序之六：一个用 FastLED 编程的LED无限魔方体
*/#include <FastLED.h>#define LED_PIN 6
#define LEDS_PER_SEGMENT 5
#define SEGMENTS 12
#define BRIGHTNESS 200
#define NUM_LEDS LEDS_PER_SEGMENT * SEGMENTS
#define NUM_LEDS_WITH_SAFETY NUM_LEDS + 1CRGB source1[NUM_LEDS_WITH_SAFETY];
CRGB source2[NUM_LEDS_WITH_SAFETY];
CRGB output[NUM_LEDS_WITH_SAFETY];uint8_t blendAmount = 0;
uint8_t patternCounter = 0;
uint8_t source1Pattern = 0;
uint8_t source2Pattern = 1;
bool useSource1 = false;void setup() {FastLED.addLeds<WS2812B, LED_PIN, GRB>(output, NUM_LEDS_WITH_SAFETY);FastLED.setBrightness(BRIGHTNESS);Serial.begin(57600);
}void loop() {EVERY_N_MILLISECONDS(10) {blend(source1, source2, output, NUM_LEDS, blendAmount); //在两个源之间混合if (useSource1) {if (blendAmount < 255) blendAmount++; //混合“向上”到源 2} else {if (blendAmount > 0) blendAmount--; //将“向下”混合到源 1}}EVERY_N_SECONDS(8) {nextPattern();}runPattern(source1Pattern, source1); //同时运行两种模式runPattern(source2Pattern, source2);FastLED.show();
}void nextPattern() {patternCounter = (patternCounter + 1) % 5;if (useSource1) source1Pattern = patternCounter;else source2Pattern = patternCounter;useSource1 = !useSource1;
}void runPattern(uint8_t pattern, CRGB *LEDarray) {switch (pattern) {case 0:rainbowComet(LEDarray);//彩虹彗星break;case 1:prettyNoise(LEDarray);//漂亮噪声break;case 2:randomStar(LEDarray);//随机星break;case 3:fillRainbow(LEDarray);//填充彩虹break;case 4:pixels(LEDarray);// 像素break;}
}uint8_t xyz(uint8_t x, uint8_t y, uint8_t z) {/*边缘的坐标从 0 到 5。每条边缘只有 5 个“真实”像素，* 所以只有 1 - 5 个 LED。缺少顶点（角）。* 如果请求这些顶点之一，则返回一个不显示的安全像素。* 我们对立方体内部的坐标也做同样的事情，即不在边缘上。*/uint8_t lps = LEDS_PER_SEGMENT;uint8_t safePx = NUM_LEDS;if ((x == 0 || x == lps + 1) && (y == 0 || y == lps + 1) && (z == 0 || z == lps + 1)) return safePx;// z 方向边缘if (x == 0 && y == 0) return (8 * lps) - z; // Seg 7if (x == 0 && y == lps + 1) return (12 * lps) - z; // Seg 11if (x == lps + 1 && y == 0) return (3 * lps) + z - 1; // Seg 3if (x == lps + 1 && y == lps + 1) return (9 * lps) + z - 1; // Seg 9// y 方向边if (x == 0 && z == 0) return y - 1; // Seg 0if (x == 0 && z == lps + 1) return (7 * lps) - y; // Seg 6if (x == lps + 1 && z == 0) return (3 * lps) - y; // Seg 2if (x == lps + 1 && z == lps + 1) return (4 * lps) + y - 1; // Seg 4// x 方向边if (y == 0 && z == 0) return (8 * lps) + x - 1; // Seg 8if (y == 0 && z == lps + 1) return (11 * lps) - x; // Seg 10if (y == lps + 1 && z == 0) return lps + x - 1; // Seg 1if (y == lps + 1 && z == lps + 1) return (6 * lps) - x; // Seg 5//如果以上都不是，我们的坐标无效return safePx;
}//------------ Patterns below ------------//void pixels(CRGB *LEDarray) {static uint8_t pos = 0;static uint8_t a = 0;static uint8_t b = 0;//填充所有像素并将它们混合在一起for (int c = 0; c <= LEDS_PER_SEGMENT + 1; c++) {LEDarray[xyz(a,b,c)] = blend(LEDarray[xyz(a,b,c)], CRGB::Orange, 128);LEDarray[xyz(a,c,b)] = blend(LEDarray[xyz(a,c,b)], CRGB::Magenta, 128);LEDarray[xyz(c,a,b)] = blend(LEDarray[xyz(c,a,b)], CRGB::Blue, 128);}EVERY_N_MILLISECONDS(33) { //围绕正方形移动的坐标if(pos < 15) a++;else if (pos <= (LEDS_PER_SEGMENT * 2) + 1) b++;else if (pos <= (LEDS_PER_SEGMENT * 3) + 2) a--;else b--;//再次开始我们到达正方形的尽头pos = (pos + 1) % ((LEDS_PER_SEGMENT + 1) * 4);}fadeToBlackBy(LEDarray, NUM_LEDS, 10);}void fillRainbow(CRGB *LEDarray) {static uint8_t pos = 0;uint8_t noise = inoise8(millis()/5);fill_rainbow(LEDarray, LEDS_PER_SEGMENT, noise, 10);//复制到其他段for (int i = 0; i < SEGMENTS; i++) {memmove8(&LEDarray[LEDS_PER_SEGMENT * i], &LEDarray[0], LEDS_PER_SEGMENT * sizeof(CRGB));}//垂直柱子上下移动的白点LEDarray[xyz(0, 0, LEDS_PER_SEGMENT - pos)] = CRGB::White;LEDarray[xyz(0, LEDS_PER_SEGMENT + 1, pos)] = CRGB::White;LEDarray[xyz(LEDS_PER_SEGMENT + 1, LEDS_PER_SEGMENT + 1, LEDS_PER_SEGMENT - pos)] = CRGB::White;LEDarray[xyz(LEDS_PER_SEGMENT + 1, 0, pos)] = CRGB::White;EVERY_N_MILLISECONDS(20) {pos = (pos + 1) % LEDS_PER_SEGMENT;}
}void rainbowComet(CRGB *LEDarray) {static uint8_t easeOutVal = 0;static uint8_t easeInVal = 0;//使图案出现在两个段上uint8_t ledsPerSegment = LEDS_PER_SEGMENT * 2;uint8_t segments = SEGMENTS / 2;easeOutVal = ease8InOutQuad(easeInVal);easeInVal++;uint8_t pos = lerp8by8(0, ledsPerSegment, easeOutVal);uint8_t hue = map(pos, 0, ledsPerSegment, 0, 230);LEDarray[pos] = CHSV(hue, 255, 255);fadeToBlackBy(LEDarray, ledsPerSegment, 20);//复制到其他段for (int i = 0; i < segments; i++) {memmove8(&LEDarray[ledsPerSegment * i], &LEDarray[0], ledsPerSegment * sizeof(CRGB));}
}void randomStar(CRGB *LEDarray) {EVERY_N_MILLISECONDS(75) {LEDarray[random16(0, NUM_LEDS)] = CRGB::LightGrey;}for (int i = 0; i < NUM_LEDS; i++) {// 亮度uint8_t bNoise = inoise8(i * 100, millis());bNoise = constrain(bNoise, 50, 200);bNoise = map(bNoise, 50, 200, 20, 80);// 色调uint8_t hNoise = inoise8(i * 20, millis() / 5);hNoise = constrain(hNoise, 50, 200);hNoise = map(hNoise, 50, 200, 160, 192);if (LEDarray[i].g == 0) {LEDarray[i] = CHSV(hNoise, 255, bNoise);}}fadeToBlackBy(LEDarray, NUM_LEDS, 5);//淡入黑色（LED 阵列，NUM LEDS，5 个）
}void prettyNoise(CRGB *LEDarray) {fill_noise16 (LEDarray, NUM_LEDS, 1, 0, 100, 1, 1, 50, millis() / 3, 5);
}
实验的视频记录（4分37秒）
https://v.youku.com/v_show/id_XNTkwMjkxMjEwMA==.html?spm=a2hcb.playlsit.page.1
实验场景图
实验的视频记录
优酷：https://v.youku.com/v_show/id_XNTkwNjYzMjIyOA==.html?spm=a2hcb.playlsit.page.1
B站：https://www.bilibili.com/video/BV1hN4y1P7U4/?vd_source=98c6b1fc23b2787403d97f8d3cc0b7e5
实验场景图
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