【Arduino】168种传感器模块系列实验（216）---WS2812B幻彩LED灯带

37款传感器与模块的提法，在网络上广泛流传，其实Arduino能够兼容的传感器模块肯定是不止37种的。鉴于本人手头积累了一些传感器和执行器模块，依照实践出真知（一定要动手做）的理念，以学习和交流为目的，这里准备逐一动手试试多做实验，不管成功与否，都会记录下来——小小的进步或是搞不掂的问题，希望能够抛砖引玉。

【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩 单点单控软灯条模块




每米30灯白底裸板

【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩单点单控软灯条模块
实验程序十九：八种模式的LED闪烁效果

/*
【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩单点单控软灯条模块
实验程序十九：八种模式的LED闪烁效果
*/

#include <Adafruit_NeoPixel.h>
#include <FastLED.h>
#include <EEPROM.h>
#define PIN 6
#define N_PIXELS  24
#define BG 0
#define COLOR_ORDER GRB  // Try mixing up the letters (RGB, GBR, BRG, etc) for a whole new world of color combinations
#define BRIGHTNESS 50   // 0-255, higher number is brighter.
#define LED_TYPE WS2812B
#define MIC_PIN   A4  // Microphone is attached to this analog pin
#define DC_OFFSET  10  // DC offset in mic signal - if unusure, leave 0
#define NOISE     10  // Noise/hum/interference in mic signal
#define SAMPLES   60  // Length of buffer for dynamic level adjustment
#define TOP       (N_PIXELS + 2) // Allow dot to go slightly off scale
#define PEAK_FALL 20  // Rate of peak falling dot
#define N_PIXELS_HALF (N_PIXELS/2)
#define GRAVITY           -9.81              // Downward (negative) acceleration of gravity in m/s^2
#define h0                1                  // Starting height, in meters, of the ball (strip length)
#define NUM_BALLS         3                  // Number of bouncing balls you want (recommend < 7, but 20 is fun in its own way)
#define SPEED .20       // Amount to increment RGB color by each cycle
int brightnessPin = A0, potPin = A1;
//config for balls
float h[NUM_BALLS] ;                         // An array of heights
float vImpact0 = sqrt( -2 * GRAVITY * h0 );  // Impact velocity of the ball when it hits the ground if "dropped" from the top of the strip
float vImpact[NUM_BALLS] ;                   // As time goes on the impact velocity will change, so make an array to store those values
float tCycle[NUM_BALLS] ;                    // The time since the last time the ball struck the ground
int   pos[NUM_BALLS] ;                       // The integer position of the dot on the strip (LED index)
long  tLast[NUM_BALLS] ;                     // The clock time of the last ground strike
float COR[NUM_BALLS] ;                       // Coefficient of Restitution (bounce damping)

float
  greenOffset = 30,
  blueOffset = 150;

byte
  peak      = 0,      // Used for falling dot
  dotCount  = 0,      // Frame counter for delaying dot-falling speed
  volCount  = 0;      // Frame counter for storing past volume data
int
  vol[SAMPLES],       // Collection of prior volume samples
  lvl       = 10,      // Current "dampened" audio level
  minLvlAvg = 0,      // For dynamic adjustment of graph low & high
  maxLvlAvg = 512;

  int brightnessValue, prevBrightnessValue;
int sensorDeviationBrightness = 1;
int sensitivityValue = 128;                               // 0 - 255, initial value (value read from the potentiometer if useSensorValues = true)
int maxSensitivity = 2 * 255;                             // let the 'volume' go up to 200%!
int ledBrightness = 255;                                   // 0 - 255, initial value (value read from the potentiometer if useSensorValues = true)
int val;

Adafruit_NeoPixel strip = Adafruit_NeoPixel(N_PIXELS, PIN, NEO_GRB + NEO_KHZ800);

// FOR SYLON ETC
uint8_t thisbeat =  23;
uint8_t thatbeat =  28;
uint8_t thisfade =   2;                                     // How quickly does it fade? Lower = slower fade rate.
uint8_t thissat = 255;                                     // The saturation, where 255 = brilliant colours.
uint8_t thisbri = 255; 

//FOR JUGGLE
uint8_t numdots = 4;                                          // Number of dots in use.
uint8_t faderate = 2;                                         // How long should the trails be. Very low value = longer trails.
uint8_t hueinc = 16;                                          // Incremental change in hue between each dot.
uint8_t thishue = 0;                                          // Starting hue.
uint8_t curhue = 0; 
uint8_t thisbright = 255;                                     // How bright should the LED/display be.
uint8_t basebeat = 5; 
uint8_t max_bright = 255; 

// Twinkle
float redStates[N_PIXELS];
float blueStates[N_PIXELS];
float greenStates[N_PIXELS];
float Fade = 0.96;

// Vu meter 4
const uint32_t Red = strip.Color(255, 0, 0);
const uint32_t Yellow = strip.Color(255, 255, 0);
const uint32_t Green = strip.Color(0, 255, 0);
const uint32_t Blue = strip.Color(0, 0, 255);
const uint32_t White = strip.Color(255, 255, 255);
const uint32_t Dark = strip.Color(0, 0, 0);
unsigned int sample;

CRGB leds[N_PIXELS];

int          myhue =   0;


// constants used here to set pin numbers:
const int buttonPin = 3;     // the number of the pushbutton pin

// Variables will change:

int buttonPushCounter = 0;   // counter for the number of button presses
int buttonState = 0;         // current state of the button
int lastButtonState = 0;

//Ripple variables
int color;
int center = 0;
int step = -1;
int maxSteps = 8;
float fadeRate = 0.80;
int diff;
 
//background color
uint32_t currentBg = random(256);
uint32_t nextBg = currentBg;

void setup() {
  delay( 2000 ); // power-up safety delay
  FastLED.addLeds<WS2812B, PIN, COLOR_ORDER>(leds, N_PIXELS).setCorrection( TypicalLEDStrip );
  FastLED.setBrightness(  BRIGHTNESS );
  analogReference(EXTERNAL);
  memset(vol, 0, sizeof(vol));
  LEDS.addLeds<LED_TYPE, PIN, COLOR_ORDER>(leds, N_PIXELS); 
  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
  
    
  //initialize the serial port
  Serial.begin(115200);
   pinMode(buttonPin, INPUT);  
    pinMode(2, OUTPUT); 
  //initialize the buttonPin as output
digitalWrite(buttonPin, HIGH); 
digitalWrite(2, HIGH); 

 for (int i = 0 ; i < NUM_BALLS ; i++) {    // Initialize variables
    tLast[i] = millis();
    h[i] = h0;
    pos[i] = 0;                              // Balls start on the ground
    vImpact[i] = vImpact0;                   // And "pop" up at vImpact0
    tCycle[i] = 0;
    COR[i] = 0.90 - float(i)/pow(NUM_BALLS,2); 
  }
}

void loop() {

   brightnessValue = analogRead(brightnessPin);
  brightnessValue = map(brightnessValue, 0, 1023, 0, 255);
  
  if (abs(brightnessValue - prevBrightnessValue) > sensorDeviationBrightness) {
    ledBrightness = brightnessValue;
    strip.setBrightness(ledBrightness);
    prevBrightnessValue = brightnessValue;
  }
  
   //for mic
  uint8_t  i;
  uint16_t minLvl, maxLvl;
  int      n, height;
  // end mic
  buttonPushCounter=EEPROM.read(0);
  // read the pushbutton input pin:
  buttonState = digitalRead(buttonPin);
    // compare the buttonState to its previous state
  if (buttonState != lastButtonState) {
    // if the state has changed, increment the counter
    if (buttonState == HIGH) {
      // if the current state is HIGH then the button
      // wend from off to on:
      buttonPushCounter++;
      Serial.println("on");
      Serial.print("number of button pushes:  ");
      Serial.println(buttonPushCounter);
      if(buttonPushCounter>=14) {
      buttonPushCounter=1;}
      EEPROM.write(0,buttonPushCounter);
      
    } 
    else {
      // if the current state is LOW then the button
      // wend from on to off:
      Serial.println("off"); 
    }
  }
  // save the current state as the last state, 
  //for next time through the loop
  
  lastButtonState = buttonState;

switch (buttonPushCounter){
          
  case 1:
     buttonPushCounter==1; {
      vu(); // Red
     break;}
       
  case 2:
     buttonPushCounter==2; {
       vu2(); // Red
      break;}
      
   case 3:
     buttonPushCounter==3; {
    Vu3(); // 
      break;}
         
    case 4:
     buttonPushCounter==4; {
    Vu4(); // 
      break;}  
      
       case 5:
     buttonPushCounter==5; {
      rainbow(150);
       break;}
       
        case 6:
     buttonPushCounter==6; {
      rainbow(20);
       break;}
       
         case 7:
     buttonPushCounter==7; {
      ripple();
       break;}
       
           case 8:
     buttonPushCounter==8; {
      ripple2();
       break;}
       
              case 9:
     buttonPushCounter==9; {
      Twinkle();
       break;}
      
         case 10:
     buttonPushCounter==10; {
      pattern2();
       break;}
       
           case 11:
     buttonPushCounter==11; {
      pattern3();
       break;}
       
           case 12:
     buttonPushCounter==12; {
    Balls(); // 
      break;}    
       
        case 13:
     buttonPushCounter==13; {
    colorWipe(strip.Color(0, 0, 0), 10); // A Black
      break;}
          
   }

}

void colorWipe(uint32_t c, uint8_t wait) {
  for(uint16_t i=0; i<strip.numPixels(); i++) {
      strip.setPixelColor(i, c);
      strip.show();
      if (digitalRead(buttonPin) != lastButtonState)  // <------------- add this
       return;         // <------------ and this
      delay(wait);
  }
}
void Vu4() {
    uint8_t  i;
  uint16_t minLvl, maxLvl;
  int      n, height;

  
  val = (analogRead(potPin));  
  val= map(val, 0, 1023, -10, 6);
  
  n   = analogRead(MIC_PIN);                        // Raw reading from mic 
  n   = abs(n - 0 - DC_OFFSET); // Center on zero
  n   = (n <= NOISE) ? 0 : (n - NOISE);             // Remove noise/hum
  
    if(val<0){
        n=n/(val*(-1));
        }
       if(val>0){
        n=n*val;
        }
  
  lvl = ((lvl * 7) + n) >> 3;    // "Dampened" reading (else looks twitchy)
 
  // Calculate bar height based on dynamic min/max levels (fixed point):
  height = TOP * (lvl - minLvlAvg) / (long)(maxLvlAvg - minLvlAvg);
 
  if(height < 0L)       height = 0;      // Clip output
  else if(height > TOP) height = TOP;
  if(height > peak)     peak   = height; // Keep 'peak' dot at top
  greenOffset += SPEED;
  blueOffset += SPEED;
  if (greenOffset >= 255) greenOffset = 0;
  if (blueOffset >= 255) blueOffset = 0;
 
  // Color pixels based on rainbow gradient
  for(i=0; i<N_PIXELS_HALF; i++) {
    if(i >= height) {              
      strip.setPixelColor(N_PIXELS_HALF-i-1,   0,   0, 0);
      strip.setPixelColor(N_PIXELS_HALF+i,   0,   0, 0);
    }
    else {
      uint32_t color = Wheel(map(i,0,N_PIXELS_HALF-1,(int)greenOffset, (int)blueOffset));
      strip.setPixelColor(N_PIXELS_HALF-i-1,color);
      strip.setPixelColor(N_PIXELS_HALF+i,color);
    }
    
  }
 
  // Draw peak dot  
  if(peak > 0 && peak <= N_PIXELS_HALF-1) {
    uint32_t color = Wheel(map(peak,0,N_PIXELS_HALF-1,30,150));
    strip.setPixelColor(N_PIXELS_HALF-peak-1,color);
    strip.setPixelColor(N_PIXELS_HALF+peak,color);
  }
  
   strip.show(); // Update strip
 
// Every few frames, make the peak pixel drop by 1:
 
    if(++dotCount >= PEAK_FALL) { //fall rate 
      
      if(peak > 0) peak--;
      dotCount = 0;
    }
 
  vol[volCount] = n;                      // Save sample for dynamic leveling
  if(++volCount >= SAMPLES) volCount = 0; // Advance/rollover sample counter
 
  // Get volume range of prior frames
  minLvl = maxLvl = vol[0];
  for(i=1; i<SAMPLES; i++) {
    if(vol[i] < minLvl)      minLvl = vol[i];
    else if(vol[i] > maxLvl) maxLvl = vol[i];
  }
  // minLvl and maxLvl indicate the volume range over prior frames, used
  // for vertically scaling the output graph (so it looks interesting
  // regardless of volume level).  If they're too close together though
  // (e.g. at very low volume levels) the graph becomes super coarse
  // and 'jumpy'...so keep some minimum distance between them (this
  // also lets the graph go to zero when no sound is playing):
  if((maxLvl - minLvl) < TOP) maxLvl = minLvl + TOP;
  minLvlAvg = (minLvlAvg * 63 + minLvl) >> 6; // Dampen min/max levels
  maxLvlAvg = (maxLvlAvg * 63 + maxLvl) >> 6; // (fake rolling average)
}

void Vu3() {
  uint8_t i;
  uint16_t minLvl, maxLvl;
  int n, height;

  val = (analogRead(potPin));  
  val= map(val, 0, 1023, -10, 6);

  n = analogRead(MIC_PIN);             // Raw reading from mic
  n = abs(n - 0 - DC_OFFSET);        // Center on zero
  n = (n <= NOISE) ? 0 : (n - NOISE);  // Remove noise/hum

      if(val<0){
        n=n/(val*(-1));
        }
       if(val>0){
        n=n*val;
        }
        
  lvl = ((lvl * 7) + n) >> 3;    // "Dampened" reading (else looks twitchy)

  // Calculate bar height based on dynamic min/max levels (fixed point):
  height = TOP * (lvl - minLvlAvg) / (long)(maxLvlAvg - minLvlAvg);

  if (height < 0L)       height = 0;      // Clip output
  else if (height > TOP) height = TOP;
  if (height > peak)     peak   = height; // Keep 'peak' dot at top

  greenOffset += SPEED;
  blueOffset += SPEED;
  if (greenOffset >= 255) greenOffset = 0;
  if (blueOffset >= 255) blueOffset = 0;

  // Color pixels based on rainbow gradient
  for (i = 0; i < N_PIXELS; i++) {
    if (i >= height) {
      strip.setPixelColor(i, 0, 0, 0);
    } else {
      strip.setPixelColor(i, Wheel(
        map(i, 0, strip.numPixels() - 1, (int)greenOffset, (int)blueOffset)
      ));
    }
  }
  // Draw peak dot  
  if(peak > 0 && peak <= N_PIXELS-1) strip.setPixelColor(peak,Wheel(map(peak,0,strip.numPixels()-1,30,150)));
  
   strip.show(); // Update strip
 
// Every few frames, make the peak pixel drop by 1:
 
    if(++dotCount >= PEAK_FALL) { //fall rate 
      
      if(peak > 0) peak--;
      dotCount = 0;
    }
  strip.show();  // Update strip

  vol[volCount] = n;
  if (++volCount >= SAMPLES) {
    volCount = 0;
  }

  // Get volume range of prior frames
  minLvl = maxLvl = vol[0];
  for (i = 1; i < SAMPLES; i++) {
    if (vol[i] < minLvl) {
      minLvl = vol[i];
    } else if (vol[i] > maxLvl) {
      maxLvl = vol[i];
    }
  }

  // minLvl and maxLvl indicate the volume range over prior frames, used
  // for vertically scaling the output graph (so it looks interesting
  // regardless of volume level).  If they're too close together though
  // (e.g. at very low volume levels) the graph becomes super coarse
  // and 'jumpy'...so keep some minimum distance between them (this
  // also lets the graph go to zero when no sound is playing):
  if ((maxLvl - minLvl) < TOP) {
    maxLvl = minLvl + TOP;
  }
  minLvlAvg = (minLvlAvg * 63 + minLvl) >> 6; // Dampen min/max levels
  maxLvlAvg = (maxLvlAvg * 63 + maxLvl) >> 6; // (fake rolling average)
}


void Balls() {
  for (int i = 0 ; i < NUM_BALLS ; i++) {
    tCycle[i] =  millis() - tLast[i] ;     // Calculate the time since the last time the ball was on the ground

    // A little kinematics equation calculates positon as a function of time, acceleration (gravity) and intial velocity
    h[i] = 0.5 * GRAVITY * pow( tCycle[i]/1000 , 2.0 ) + vImpact[i] * tCycle[i]/1000;

    if ( h[i] < 0 ) {                      
      h[i] = 0;                            // If the ball crossed the threshold of the "ground," put it back on the ground
      vImpact[i] = COR[i] * vImpact[i] ;   // and recalculate its new upward velocity as it's old velocity * COR
      tLast[i] = millis();

      if ( vImpact[i] < 0.01 ) vImpact[i] = vImpact0;  // If the ball is barely moving, "pop" it back up at vImpact0
    }
    pos[i] = round( h[i] * (N_PIXELS - 1) / h0);       // Map "h" to a "pos" integer index position on the LED strip
  }

  //Choose color of LEDs, then the "pos" LED on
  for (int i = 0 ; i < NUM_BALLS ; i++) leds[pos[i]] = CHSV( uint8_t (i * 40) , 255, 255);
  FastLED.show();
  //Then off for the next loop around
  for (int i = 0 ; i < NUM_BALLS ; i++) {
    leds[pos[i]] = CRGB::Black;
  }
}

// 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();
     if (digitalRead(buttonPin) != lastButtonState)  // <------------- add this
       return;         // <------------ and this
      delay(wait);
        }
    }
// HERE

void vu() {
 
  uint8_t  i;
  uint16_t minLvl, maxLvl;
  int      n, height;

  val = (analogRead(potPin));  
  val= map(val, 0, 1023, -10, 6);
  
  n   = analogRead(MIC_PIN);                        // Raw reading from mic 
  n   = abs(n - 0 - DC_OFFSET); // Center on zero
  n   = (n <= NOISE) ? 0 : (n - NOISE);             // Remove noise/hum
     if(val<0){
        n=n/(val*(-1));
        }
       if(val>0){
        n=n*val;
        }
  lvl = ((lvl * 7) + n) >> 3;    // "Dampened" reading (else looks twitchy)
 
  // Calculate bar height based on dynamic min/max levels (fixed point):
  height = TOP * (lvl - minLvlAvg) / (long)(maxLvlAvg - minLvlAvg);
 
  if(height < 0L)       height = 0;      // Clip output
  else if(height > TOP) height = TOP;
  if(height > peak)     peak   = height; // Keep 'peak' dot at top
 
 
  // Color pixels based on rainbow gradient
  for(i=0; i<N_PIXELS; i++) {
    if(i >= height)               strip.setPixelColor(i,   0,   0, 0);
    else strip.setPixelColor(i,Wheel(map(i,0,strip.numPixels()-1,30,150)));    
  }
 
  // Draw peak dot  
  if(peak > 0 && peak <= N_PIXELS-1) strip.setPixelColor(peak,Wheel(map(peak,0,strip.numPixels()-1,30,150)));
  
   strip.show(); // Update strip
 
// Every few frames, make the peak pixel drop by 1:
 
    if(++dotCount >= PEAK_FALL) { //fall rate 
      
      if(peak > 0) peak--;
      dotCount = 0;
    }
 
  vol[volCount] = n;                      // Save sample for dynamic leveling
  if(++volCount >= SAMPLES) volCount = 0; // Advance/rollover sample counter
 
  // Get volume range of prior frames
  minLvl = maxLvl = vol[0];
  for(i=1; i<SAMPLES; i++) {
    if(vol[i] < minLvl)      minLvl = vol[i];
    else if(vol[i] > maxLvl) maxLvl = vol[i];
  }
  // minLvl and maxLvl indicate the volume range over prior frames, used
  // for vertically scaling the output graph (so it looks interesting
  // regardless of volume level).  If they're too close together though
  // (e.g. at very low volume levels) the graph becomes super coarse
  // and 'jumpy'...so keep some minimum distance between them (this
  // also lets the graph go to zero when no sound is playing):
  if((maxLvl - minLvl) < TOP) maxLvl = minLvl + TOP;
  minLvlAvg = (minLvlAvg * 63 + minLvl) >> 6; // Dampen min/max levels
  maxLvlAvg = (maxLvlAvg * 63 + maxLvl) >> 6; // (fake rolling average)
 
}
 
// Input a value 0 to 255 to get a color value.
// The colors are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
  if(WheelPos < 85) {
   return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
  } else if(WheelPos < 170) {
   WheelPos -= 85;
   return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  } else {
   WheelPos -= 170;
   return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
}

void vu2() {
  
  uint8_t  i;
  uint16_t minLvl, maxLvl;
  int      n, height;
 
  val = (analogRead(potPin));  
  val= map(val, 0, 1023, -10, 6);
  n   = analogRead(MIC_PIN);                        // Raw reading from mic 
  n   = abs(n - 0 - DC_OFFSET); // Center on zero
  n   = (n <= NOISE) ? 0 : (n - NOISE);             // Remove noise/hum

      if(val<0){
        n=n/(val*(-1));
        }
       if(val>0){
        n=n*val;
        }
  lvl = ((lvl * 7) + n) >> 3;    // "Dampened" reading (else looks twitchy)
 
  // Calculate bar height based on dynamic min/max levels (fixed point):
  height = TOP * (lvl - minLvlAvg) / (long)(maxLvlAvg - minLvlAvg);
 
  if(height < 0L)       height = 0;      // Clip output
  else if(height > TOP) height = TOP;
  if(height > peak)     peak   = height; // Keep 'peak' dot at top
 
 
  // Color pixels based on rainbow gradient
  for(i=0; i<N_PIXELS_HALF; i++) {
    if(i >= height) {              
      strip.setPixelColor(N_PIXELS_HALF-i-1,   0,   0, 0);
      strip.setPixelColor(N_PIXELS_HALF+i,   0,   0, 0);
    }
    else {
      uint32_t color = Wheel(map(i,0,N_PIXELS_HALF-1,30,150));
      strip.setPixelColor(N_PIXELS_HALF-i-1,color);
      strip.setPixelColor(N_PIXELS_HALF+i,color);
    }  
  }
 
  // Draw peak dot  
  if(peak > 0 && peak <= N_PIXELS_HALF-1) {
    uint32_t color = Wheel(map(peak,0,N_PIXELS_HALF-1,30,150));
    strip.setPixelColor(N_PIXELS_HALF-peak-1,color);
    strip.setPixelColor(N_PIXELS_HALF+peak,color);
  }
  
   strip.show(); // Update strip
 
// Every few frames, make the peak pixel drop by 1:
 
    if(++dotCount >= PEAK_FALL) { //fall rate 
      
      if(peak > 0) peak--;
      dotCount = 0;
    }
 
  vol[volCount] = n;                      // Save sample for dynamic leveling
  if(++volCount >= SAMPLES) volCount = 0; // Advance/rollover sample counter
 
  // Get volume range of prior frames
  minLvl = maxLvl = vol[0];
  for(i=1; i<SAMPLES; i++) {
    if(vol[i] < minLvl)      minLvl = vol[i];
    else if(vol[i] > maxLvl) maxLvl = vol[i];
  }
  // minLvl and maxLvl indicate the volume range over prior frames, used
  // for vertically scaling the output graph (so it looks interesting
  // regardless of volume level).  If they're too close together though
  // (e.g. at very low volume levels) the graph becomes super coarse
  // and 'jumpy'...so keep some minimum distance between them (this
  // also lets the graph go to zero when no sound is playing):
  if((maxLvl - minLvl) < TOP) maxLvl = minLvl + TOP;
  minLvlAvg = (minLvlAvg * 63 + minLvl) >> 6; // Dampen min/max levels
  maxLvlAvg = (maxLvlAvg * 63 + maxLvl) >> 6; // (fake rolling average)
}

//here................

 void ripple() {
 
    if (currentBg == nextBg) {
      nextBg = random(256);
    }
    else if (nextBg > currentBg) {
      currentBg++;
    } else {
      currentBg--;
    }
    for(uint16_t l = 0; l < N_PIXELS; l++) {
      leds[l] = CHSV(currentBg, 255, 50);         // strip.setPixelColor(l, Wheel(currentBg, 0.1));
    }
 
  if (step == -1) {
    center = random(N_PIXELS);
    color = random(256);
    step = 0;
  }
 
  if (step == 0) {
    leds[center] = CHSV(color, 255, 255);         // strip.setPixelColor(center, Wheel(color, 1));
    step ++;
  }
  else {
    if (step < maxSteps) {
      Serial.println(pow(fadeRate,step));
 
      leds[wrap(center + step)] = CHSV(color, 255, pow(fadeRate, step)*255);       //   strip.setPixelColor(wrap(center + step), Wheel(color, pow(fadeRate, step)));
      leds[wrap(center - step)] = CHSV(color, 255, pow(fadeRate, step)*255);       //   strip.setPixelColor(wrap(center - step), Wheel(color, pow(fadeRate, step)));
      if (step > 3) {
        leds[wrap(center + step - 3)] = CHSV(color, 255, pow(fadeRate, step - 2)*255);     //   strip.setPixelColor(wrap(center + step - 3), Wheel(color, pow(fadeRate, step - 2)));
        leds[wrap(center - step + 3)] = CHSV(color, 255, pow(fadeRate, step - 2)*255);     //   strip.setPixelColor(wrap(center - step + 3), Wheel(color, pow(fadeRate, step - 2)));
      }
      step ++;
    }
    else {
      step = -1;
    }
  }
 
  LEDS.show();
  delay(50);
}
 
int wrap(int step) {
  if(step < 0) return N_PIXELS + step;
  if(step > N_PIXELS - 1) return step - N_PIXELS;
  return step;
}
 
 
void one_color_allHSV(int ahue, int abright) {                // SET ALL LEDS TO ONE COLOR (HSV)
  for (int i = 0 ; i < N_PIXELS; i++ ) {
    leds[i] = CHSV(ahue, 255, abright);
  }
}

void ripple2() {
  if (BG){
    if (currentBg == nextBg) {
      nextBg = random(256);
    } 
    else if (nextBg > currentBg) {
      currentBg++;
    } else {
      currentBg--;
    }
    for(uint16_t l = 0; l < N_PIXELS; l++) {
      strip.setPixelColor(l, Wheel(currentBg, 0.1));
    }
  } else {
    for(uint16_t l = 0; l < N_PIXELS; l++) {
      strip.setPixelColor(l, 0, 0, 0);
    }
  }
 
  if (step == -1) {
    center = random(N_PIXELS);
    color = random(256);
    step = 0;
  }
 
  if (step == 0) {
    strip.setPixelColor(center, Wheel(color, 1));
    step ++;
  } 
  else {
    if (step < maxSteps) {
      strip.setPixelColor(wrap(center + step), Wheel(color, pow(fadeRate, step)));
      strip.setPixelColor(wrap(center - step), Wheel(color, pow(fadeRate, step)));
      if (step > 3) {
        strip.setPixelColor(wrap(center + step - 3), Wheel(color, pow(fadeRate, step - 2)));
        strip.setPixelColor(wrap(center - step + 3), Wheel(color, pow(fadeRate, step - 2)));
      }
      step ++;
    } 
    else {
      step = -1;
    }
  }
  
  strip.show();
  delay(50);
}
//int wrap(int step) {
//  if(step < 0) return Pixels + step;
//  if(step > Pixels - 1) return step - Pixels;
//  return step;
//}
 
// 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, float opacity) {
  
  if(WheelPos < 85) {
    return strip.Color((WheelPos * 3) * opacity, (255 - WheelPos * 3) * opacity, 0);
  } 
  else if(WheelPos < 170) {
    WheelPos -= 85;
    return strip.Color((255 - WheelPos * 3) * opacity, 0, (WheelPos * 3) * opacity);
  } 
  else {
    WheelPos -= 170;
    return strip.Color(0, (WheelPos * 3) * opacity, (255 - WheelPos * 3) * opacity);
  }
}

   void pattern2() {
      
       sinelon();                                                  // Call our sequence.
  show_at_max_brightness_for_power();                         // Power managed display of LED's.
} // loop()


void sinelon() {
  // a colored dot sweeping back and forth, with fading trails
  fadeToBlackBy( leds, N_PIXELS, thisfade);
  int pos1 = beatsin16(thisbeat,0,N_PIXELS);
  int pos2 = beatsin16(thatbeat,0,N_PIXELS);
    leds[(pos1+pos2)/2] += CHSV( myhue++/64, thissat, thisbri);
}
// Pattern 3 - JUGGLE
    void pattern3() {
       ChangeMe();
  juggle();
  show_at_max_brightness_for_power();                         // Power managed display of LED's.
} // loop()

void juggle() {                                               // Several colored dots, weaving in and out of sync with each other
  curhue = thishue;                                          // Reset the hue values.
  fadeToBlackBy(leds, N_PIXELS, faderate);
  for( int i = 0; i < numdots; i++) {
    leds[beatsin16(basebeat+i+numdots,0,N_PIXELS)] += CHSV(curhue, thissat, thisbright);   //beat16 is a FastLED 3.1 function
    curhue += hueinc;
  }
} // juggle()

void ChangeMe() {                                             // A time (rather than loop) based demo sequencer. This gives us full control over the length of each sequence.
  uint8_t secondHand = (millis() / 1000) % 30;                // IMPORTANT!!! Change '30' to a different value to change duration of the loop.
  static uint8_t lastSecond = 99;                             // Static variable, means it's only defined once. This is our 'debounce' variable.
  if (lastSecond != secondHand) {                             // Debounce to make sure we're not repeating an assignment.
    lastSecond = secondHand;
    if (secondHand ==  0)  {numdots=1; faderate=2;}  // You can change values here, one at a time , or altogether.
    if (secondHand == 10)  {numdots=4; thishue=128; faderate=8;}
    if (secondHand == 20)  {hueinc=48; thishue=random8();}                               // Only gets called once, and not continuously for the next several seconds. Therefore, no rainbows.
  }
} // ChangeMe()

void Twinkle () {
   if (random(25) == 1) {
      uint16_t i = random(N_PIXELS);
      if (redStates[i] < 1 && greenStates[i] < 1 && blueStates[i] < 1) {
        redStates[i] = random(256);
        greenStates[i] = random(256);
        blueStates[i] = random(256);
      }
    }
    
    for(uint16_t l = 0; l < N_PIXELS; l++) {
      if (redStates[l] > 1 || greenStates[l] > 1 || blueStates[l] > 1) {
        strip.setPixelColor(l, redStates[l], greenStates[l], blueStates[l]);
        
        if (redStates[l] > 1) {
          redStates[l] = redStates[l] * Fade;
        } else {
          redStates[l] = 0;
        }
        
        if (greenStates[l] > 1) {
          greenStates[l] = greenStates[l] * Fade;
        } else {
          greenStates[l] = 0;
        }
        
        if (blueStates[l] > 1) {
          blueStates[l] = blueStates[l] * Fade;
        } else {
          blueStates[l] = 0;
        }
        
      } else {
        strip.setPixelColor(l, 0, 0, 0);
      }
    }
    strip.show();
     delay(10);
  
}

// TOO HERE

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();
    // check if a button pressed
    if (digitalRead(buttonPin) != lastButtonState)  // <------------- add this
       return;         // <------------ and this
    delay(wait);
  }
}
复制代码

  【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
  实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩单点单控软灯条模块
  实验程序十四：闪烁的“假日”灯，淡入淡出

/*
  【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
  实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩单点单控软灯条模块
  实验程序十四：闪烁的“假日”灯，淡入淡出
*/

#include "FastLED.h"
#define NUM_LEDS     24
#define LED_TYPE   WS2811
#define COLOR_ORDER   GRB
#define DATA_PIN        6
//#define CLK_PIN       4
#define VOLTS          12
#define MAX_MA       4000

CRGBArray<NUM_LEDS> leds;

#define TWINKLE_SPEED 7 //整体闪烁速度,0（非常慢）到 8（非常快）
#define TWINKLE_DENSITY 5 // 整体闪烁密度,0（NONE 点亮）到 8（ALL 一次点亮）
#define SECONDS_PER_PALETTE  10 // 多久更换一次调色板

// Background color for 'unlit' pixels
// Can be set to CRGB::Black if desired.
CRGB gBackgroundColor = CRGB::Black; 
// Example of dim incandescent fairy light background color
// CRGB gBackgroundColor = CRGB(CRGB::FairyLight).nscale8_video(16);

// If AUTO_SELECT_BACKGROUND_COLOR is set to 1,
// then for any palette where the first two entries 
// are the same, a dimmed version of that color will
// automatically be used as the background color.
#define AUTO_SELECT_BACKGROUND_COLOR 0

// If COOL_LIKE_INCANDESCENT is set to 1, colors will 
// fade out slighted 'reddened', similar to how
// incandescent bulbs change color as they get dim down.
#define COOL_LIKE_INCANDESCENT 1


CRGBPalette16 gCurrentPalette;
CRGBPalette16 gTargetPalette;

void setup() {
  delay( 1000 ); //safety startup delay
  FastLED.setMaxPowerInVoltsAndMilliamps( VOLTS, MAX_MA);
  FastLED.addLeds<LED_TYPE,DATA_PIN,COLOR_ORDER>(leds, NUM_LEDS)
    .setCorrection(TypicalLEDStrip);

  chooseNextColorPalette(gTargetPalette);
}


void loop(){
  EVERY_N_SECONDS( SECONDS_PER_PALETTE ) { 
    chooseNextColorPalette( gTargetPalette ); 
  }
  
  EVERY_N_MILLISECONDS( 10 ) {
    nblendPaletteTowardPalette( gCurrentPalette, gTargetPalette, 12);
  }

  drawTwinkles( leds);
  
  FastLED.show();
}

//  This function loops over each pixel, calculates the 
//  adjusted 'clock' that this pixel should use, and calls 
//  "CalculateOneTwinkle" on each pixel.  It then displays
//  either the twinkle color of the background color, 
//  whichever is brighter.
void drawTwinkles( CRGBSet& L){
  // "PRNG16" is the pseudorandom number generator
  // It MUST be reset to the same starting value each time
  // this function is called, so that the sequence of 'random'
  // numbers that it generates is (paradoxically) stable.
  uint16_t PRNG16 = 11337;
  
  uint32_t clock32 = millis();

  // Set up the background color, "bg".
  // if AUTO_SELECT_BACKGROUND_COLOR == 1, and the first two colors of
  // the current palette are identical, then a deeply faded version of
  // that color is used for the background color
  CRGB bg;
  if( (AUTO_SELECT_BACKGROUND_COLOR == 1) &&
      (gCurrentPalette[0] == gCurrentPalette[1] )) {
    bg = gCurrentPalette[0];
    uint8_t bglight = bg.getAverageLight();
    if( bglight > 64) {
      bg.nscale8_video( 16); // very bright, so scale to 1/16th
    } else if( bglight > 16) {
      bg.nscale8_video( 64); // not that bright, so scale to 1/4th
    } else {
      bg.nscale8_video( 86); // dim, scale to 1/3rd.
    }
  } else {
    bg = gBackgroundColor; // just use the explicitly defined background color
  }

  uint8_t backgroundBrightness = bg.getAverageLight();
  
  for( CRGB& pixel: L) {
    PRNG16 = (uint16_t)(PRNG16 * 2053) + 1384; // next 'random' number
    uint16_t myclockoffset16= PRNG16; // use that number as clock offset
    PRNG16 = (uint16_t)(PRNG16 * 2053) + 1384; // next 'random' number
    // use that number as clock speed adjustment factor (in 8ths, from 8/8ths to 23/8ths)
    uint8_t myspeedmultiplierQ5_3 =  ((((PRNG16 & 0xFF)>>4) + (PRNG16 & 0x0F)) & 0x0F) + 0x08;
    uint32_t myclock30 = (uint32_t)((clock32 * myspeedmultiplierQ5_3) >> 3) + myclockoffset16;
    uint8_t  myunique8 = PRNG16 >> 8; // get 'salt' value for this pixel

    // We now have the adjusted 'clock' for this pixel, now we call
    // the function that computes what color the pixel should be based
    // on the "brightness = f( time )" idea.
    CRGB c = computeOneTwinkle( myclock30, myunique8);

    uint8_t cbright = c.getAverageLight();
    int16_t deltabright = cbright - backgroundBrightness;
    if( deltabright >= 32 || (!bg)) {
      // If the new pixel is significantly brighter than the background color, 
      // use the new color.
      pixel = c;
    } else if( deltabright > 0 ) {
      // If the new pixel is just slightly brighter than the background color,
      // mix a blend of the new color and the background color
      pixel = blend( bg, c, deltabright * 8);
    } else { 
      // if the new pixel is not at all brighter than the background color,
      // just use the background color.
      pixel = bg;
    }
  }
}


//  This function takes a time in pseudo-milliseconds,
//  figures out brightness = f( time ), and also hue = f( time )
//  The 'low digits' of the millisecond time are used as 
//  input to the brightness wave function.  
//  The 'high digits' are used to select a color, so that the color
//  does not change over the course of the fade-in, fade-out
//  of one cycle of the brightness wave function.
//  The 'high digits' are also used to determine whether this pixel
//  should light at all during this cycle, based on the TWINKLE_DENSITY.
CRGB computeOneTwinkle( uint32_t ms, uint8_t salt)
{
  uint16_t ticks = ms >> (8-TWINKLE_SPEED);
  uint8_t fastcycle8 = ticks;
  uint16_t slowcycle16 = (ticks >> 8) + salt;
  slowcycle16 += sin8( slowcycle16);
  slowcycle16 =  (slowcycle16 * 2053) + 1384;
  uint8_t slowcycle8 = (slowcycle16 & 0xFF) + (slowcycle16 >> 8);
  
  uint8_t bright = 0;
  if( ((slowcycle8 & 0x0E)/2) < TWINKLE_DENSITY) {
    bright = attackDecayWave8( fastcycle8);
  }

  uint8_t hue = slowcycle8 - salt;
  CRGB c;
  if( bright > 0) {
    c = ColorFromPalette( gCurrentPalette, hue, bright, NOBLEND);
    if( COOL_LIKE_INCANDESCENT == 1 ) {
      coolLikeIncandescent( c, fastcycle8);
    }
  } else {
    c = CRGB::Black;
  }
  return c;
}


// This function is like 'triwave8', which produces a 
// symmetrical up-and-down triangle sawtooth waveform, except that this
// function produces a triangle wave with a faster attack and a slower decay:
//
//     / \ 
//    /     \ 
//   /         \ 
//  /             \ 
//

uint8_t attackDecayWave8( uint8_t i)
{
  if( i < 86) {
    return i * 3;
  } else {
    i -= 86;
    return 255 - (i + (i/2));
  }
}

// This function takes a pixel, and if its in the 'fading down'
// part of the cycle, it adjusts the color a little bit like the 
// way that incandescent bulbs fade toward 'red' as they dim.
void coolLikeIncandescent( CRGB& c, uint8_t phase)
{
  if( phase < 128) return;

  uint8_t cooling = (phase - 128) >> 4;
  c.g = qsub8( c.g, cooling);
  c.b = qsub8( c.b, cooling * 2);
}

// A mostly red palette with green accents and white trim.
// "CRGB::Gray" is used as white to keep the brightness more uniform.
const TProgmemRGBPalette16 RedGreenWhite_p FL_PROGMEM =
{  CRGB::Red, CRGB::Red, CRGB::Red, CRGB::Red, 
   CRGB::Red, CRGB::Red, CRGB::Red, CRGB::Red, 
   CRGB::Red, CRGB::Red, CRGB::Gray, CRGB::Gray, 
   CRGB::Green, CRGB::Green, CRGB::Green, CRGB::Green };

// A mostly (dark) green palette with red berries.
#define Holly_Green 0x00580c
#define Holly_Red   0xB00402
const TProgmemRGBPalette16 Holly_p FL_PROGMEM =
{  Holly_Green, Holly_Green, Holly_Green, Holly_Green, 
   Holly_Green, Holly_Green, Holly_Green, Holly_Green, 
   Holly_Green, Holly_Green, Holly_Green, Holly_Green, 
   Holly_Green, Holly_Green, Holly_Green, Holly_Red 
};

// A red and white striped palette
// "CRGB::Gray" is used as white to keep the brightness more uniform.
const TProgmemRGBPalette16 RedWhite_p FL_PROGMEM =
{  CRGB::Red,  CRGB::Red,  CRGB::Red,  CRGB::Red, 
   CRGB::Gray, CRGB::Gray, CRGB::Gray, CRGB::Gray,
   CRGB::Red,  CRGB::Red,  CRGB::Red,  CRGB::Red, 
   CRGB::Gray, CRGB::Gray, CRGB::Gray, CRGB::Gray };

// A mostly blue palette with white accents.
// "CRGB::Gray" is used as white to keep the brightness more uniform.
const TProgmemRGBPalette16 BlueWhite_p FL_PROGMEM =
{  CRGB::Blue, CRGB::Blue, CRGB::Blue, CRGB::Blue, 
   CRGB::Blue, CRGB::Blue, CRGB::Blue, CRGB::Blue, 
   CRGB::Blue, CRGB::Blue, CRGB::Blue, CRGB::Blue, 
   CRGB::Blue, CRGB::Gray, CRGB::Gray, CRGB::Gray };

// A pure "fairy light" palette with some brightness variations
#define HALFFAIRY ((CRGB::FairyLight & 0xFEFEFE) / 2)
#define QUARTERFAIRY ((CRGB::FairyLight & 0xFCFCFC) / 4)
const TProgmemRGBPalette16 FairyLight_p FL_PROGMEM =
{  CRGB::FairyLight, CRGB::FairyLight, CRGB::FairyLight, CRGB::FairyLight, 
   HALFFAIRY,        HALFFAIRY,        CRGB::FairyLight, CRGB::FairyLight, 
   QUARTERFAIRY,     QUARTERFAIRY,     CRGB::FairyLight, CRGB::FairyLight, 
   CRGB::FairyLight, CRGB::FairyLight, CRGB::FairyLight, CRGB::FairyLight };

// A palette of soft snowflakes with the occasional bright one
const TProgmemRGBPalette16 Snow_p FL_PROGMEM =
{  0x304048, 0x304048, 0x304048, 0x304048,
   0x304048, 0x304048, 0x304048, 0x304048,
   0x304048, 0x304048, 0x304048, 0x304048,
   0x304048, 0x304048, 0x304048, 0xE0F0FF };

// A palette reminiscent of large 'old-school' C9-size tree lights
// in the five classic colors: red, orange, green, blue, and white.
#define C9_Red    0xB80400
#define C9_Orange 0x902C02
#define C9_Green  0x046002
#define C9_Blue   0x070758
#define C9_White  0x606820
const TProgmemRGBPalette16 RetroC9_p FL_PROGMEM =
{  C9_Red,    C9_Orange, C9_Red,    C9_Orange,
   C9_Orange, C9_Red,    C9_Orange, C9_Red,
   C9_Green,  C9_Green,  C9_Green,  C9_Green,
   C9_Blue,   C9_Blue,   C9_Blue,
   C9_White
};

// A cold, icy pale blue palette
#define Ice_Blue1 0x0C1040
#define Ice_Blue2 0x182080
#define Ice_Blue3 0x5080C0
const TProgmemRGBPalette16 Ice_p FL_PROGMEM =
{
  Ice_Blue1, Ice_Blue1, Ice_Blue1, Ice_Blue1,
  Ice_Blue1, Ice_Blue1, Ice_Blue1, Ice_Blue1,
  Ice_Blue1, Ice_Blue1, Ice_Blue1, Ice_Blue1,
  Ice_Blue2, Ice_Blue2, Ice_Blue2, Ice_Blue3
};


// Add or remove palette names from this list to control which color
// palettes are used, and in what order.
const TProgmemRGBPalette16* ActivePaletteList[] = {
  &RetroC9_p,
  &BlueWhite_p,
  &RainbowColors_p,
  &FairyLight_p,
  &RedGreenWhite_p,
  &PartyColors_p,
  &RedWhite_p,
  &Snow_p,
  &Holly_p,
  &Ice_p  
};


// Advance to the next color palette in the list (above).
void chooseNextColorPalette( CRGBPalette16& pal)
{
  const uint8_t numberOfPalettes = sizeof(ActivePaletteList) / sizeof(ActivePaletteList[0]);
  static uint8_t whichPalette = -1; 
  whichPalette = addmod8( whichPalette, 1, numberOfPalettes);

  pal = *(ActivePaletteList[whichPalette]);
}
复制代码

  【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
  实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩单点单控软灯条模块
  实验程序十七：内置调色板（森林，云彩，熔岩，海洋，派对）

/*
  【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
  实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩单点单控软灯条模块
  实验程序十七：内置调色板（森林，云彩，熔岩，海洋，派对）
*/

#include <FastLED.h>

#define LED_PIN     6
#define BRIGHTNESS  24
#define LED_TYPE    WS2811
#define COLOR_ORDER GRB
#define BRIGHTNESS  33

// Params for width and height
const uint8_t kMatrixWidth  = 24;
const uint8_t kMatrixHeight = 1;

// Param for different pixel layouts
const bool    kMatrixSerpentineLayout = true;

#define NUM_LEDS (kMatrixWidth * kMatrixHeight)
#define MAX_DIMENSION ((kMatrixWidth>kMatrixHeight) ? kMatrixWidth : kMatrixHeight)

// The leds
CRGB leds[kMatrixWidth * kMatrixHeight];

// The 16 bit version of our coordinates
static uint16_t x;
static uint16_t y;
static uint16_t z;

// We're using the x/y dimensions to map to the x/y pixels on the matrix.  We'll
// use the z-axis for "time".  speed determines how fast time moves forward.  Try
// 1 for a very slow moving effect, or 60 for something that ends up looking like
// water.
uint16_t speed = 20; // speed is set dynamically once we've started up

// Scale determines how far apart the pixels in our noise matrix are.  Try
// changing these values around to see how it affects the motion of the display.  The
// higher the value of scale, the more "zoomed out" the noise iwll be.  A value
// of 1 will be so zoomed in, you'll mostly see solid colors.
uint16_t scale = 30; // scale is set dynamically once we've started up

// This is the array that we keep our computed noise values in
uint8_t noise[MAX_DIMENSION][MAX_DIMENSION];

CRGBPalette16 currentPalette( PartyColors_p );
uint8_t       colorLoop = 1;

void setup() {
  delay(3000);
  FastLED.addLeds<LED_TYPE,LED_PIN,COLOR_ORDER>(leds,NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS);

  // Initialize our coordinates to some random values
  x = random16();
  y = random16();
  z = random16();
}

// Fill the x/y array of 8-bit noise values using the inoise8 function.
void fillnoise8() {
  // If we're runing at a low "speed", some 8-bit artifacts become visible
  // from frame-to-frame.  In order to reduce this, we can do some fast data-smoothing.
  // The amount of data smoothing we're doing depends on "speed".
  uint8_t dataSmoothing = 0;
  if( speed < 50) {
    dataSmoothing = 200 - (speed * 4);
  }
  
  for(int i = 0; i < MAX_DIMENSION; i++) {
    int ioffset = scale * i;
    for(int j = 0; j < MAX_DIMENSION; j++) {
      int joffset = scale * j;
      
      uint8_t data = inoise8(x + ioffset,y + joffset,z);

      // The range of the inoise8 function is roughly 16-238.
      // These two operations expand those values out to roughly 0..255
      // You can comment them out if you want the raw noise data.
      data = qsub8(data,16);
      data = qadd8(data,scale8(data,39));

      if( dataSmoothing ) {
        uint8_t olddata = noise[i][j];
        uint8_t newdata = scale8( olddata, dataSmoothing) + scale8( data, 256 - dataSmoothing);
        data = newdata;
      }
      
      noise[i][j] = data;
    }
  }
  
  z += speed;
  
  // apply slow drift to X and Y, just for visual variation.
  x += speed / 8;
  y -= speed / 16;
}

void mapNoiseToLEDsUsingPalette()
{
  static uint8_t ihue=0;
  
  for(int i = 0; i < kMatrixWidth; i++) {
    for(int j = 0; j < kMatrixHeight; j++) {
      // We use the value at the (i,j) coordinate in the noise
      // array for our brightness, and the flipped value from (j,i)
      // for our pixel's index into the color palette.

      uint8_t index = noise[j][i];
      uint8_t bri =   noise[i][j];

      // if this palette is a 'loop', add a slowly-changing base value
      if( colorLoop) { 
        index += ihue;
      }

      // brighten up, as the color palette itself often contains the 
      // light/dark dynamic range desired
      if( bri > 127 ) {
        bri = 255;
      } else {
        bri = dim8_raw( bri * 2);
      }

      CRGB color = ColorFromPalette( currentPalette, index, bri);
      leds[XY(i,j)] = color;
    }
  }
  
  ihue+=1;
}

void loop() {
  // Periodically choose a new palette, speed, and scale
  ChangePaletteAndSettingsPeriodically();

  // generate noise data
  fillnoise8();
  
  // convert the noise data to colors in the LED array
  // using the current palette
  mapNoiseToLEDsUsingPalette();

  FastLED.show();
  // delay(10);
}

#define HOLD_PALETTES_X_TIMES_AS_LONG 1

void ChangePaletteAndSettingsPeriodically()
{
  uint8_t secondHand = ((millis() / 1000) / HOLD_PALETTES_X_TIMES_AS_LONG) % 60;
  static uint8_t lastSecond = 99;
  
  if( lastSecond != secondHand) {
    lastSecond = secondHand;
    if( secondHand ==  0)  { currentPalette = RainbowColors_p;         speed = 20; scale = 30; colorLoop = 1; }
    if( secondHand ==  5)  { SetupPurpleAndGreenPalette();             speed = 10; scale = 50; colorLoop = 1; }
    if( secondHand == 10)  { SetupBlackAndWhiteStripedPalette();       speed = 20; scale = 30; colorLoop = 1; }
    if( secondHand == 15)  { currentPalette = ForestColors_p;          speed =  8; scale =120; colorLoop = 0; }
    if( secondHand == 20)  { currentPalette = CloudColors_p;           speed =  4; scale = 30; colorLoop = 0; }
    if( secondHand == 25)  { currentPalette = LavaColors_p;            speed =  8; scale = 50; colorLoop = 0; }
    if( secondHand == 30)  { currentPalette = OceanColors_p;           speed = 20; scale = 90; colorLoop = 0; }
    if( secondHand == 35)  { currentPalette = PartyColors_p;           speed = 20; scale = 30; colorLoop = 1; }
    if( secondHand == 40)  { SetupRandomPalette();                     speed = 20; scale = 20; colorLoop = 1; }
    if( secondHand == 45)  { SetupRandomPalette();                     speed = 50; scale = 50; colorLoop = 1; }
    if( secondHand == 50)  { SetupRandomPalette();                     speed = 90; scale = 90; colorLoop = 1; }
    if( secondHand == 55)  { currentPalette = RainbowStripeColors_p;   speed = 30; scale = 20; colorLoop = 1; }
  }
}

// This function generates a random palette that's a gradient
// between four different colors.  The first is a dim hue, the second is 
// a bright hue, the third is a bright pastel, and the last is 
// another bright hue.  This gives some visual bright/dark variation
// which is more interesting than just a gradient of different hues.
void SetupRandomPalette()
{
  currentPalette = CRGBPalette16( 
                      CHSV( random8(), 255, 32), 
                      CHSV( random8(), 255, 255), 
                      CHSV( random8(), 128, 255), 
                      CHSV( random8(), 255, 255)); 
}

// This function sets up a palette of black and white stripes,
// using code.  Since the palette is effectively an array of
// sixteen CRGB colors, the various fill_* functions can be used
// to set them up.
void SetupBlackAndWhiteStripedPalette()
{
  // 'black out' all 16 palette entries...
  fill_solid( currentPalette, 16, CRGB::Black);
  // and set every fourth one to white.
  currentPalette[0] = CRGB::White;
  currentPalette[4] = CRGB::White;
  currentPalette[8] = CRGB::White;
  currentPalette[12] = CRGB::White;

}

// This function sets up a palette of purple and green stripes.
void SetupPurpleAndGreenPalette()
{
  CRGB purple = CHSV( HUE_PURPLE, 255, 255);
  CRGB green  = CHSV( HUE_GREEN, 255, 255);
  CRGB black  = CRGB::Black;
  
  currentPalette = CRGBPalette16( 
    green,  green,  black,  black,
    purple, purple, black,  black,
    green,  green,  black,  black,
    purple, purple, black,  black );
}


//
// Mark's xy coordinate mapping code.  See the XYMatrix for more information on it.
//
uint16_t XY( uint8_t x, uint8_t y)
{
  uint16_t i;
  if( kMatrixSerpentineLayout == false) {
    i = (y * kMatrixWidth) + x;
  }
  if( kMatrixSerpentineLayout == true) {
    if( y & 0x01) {
      // Odd rows run backwards
      uint8_t reverseX = (kMatrixWidth - 1) - x;
      i = (y * kMatrixWidth) + reverseX;
    } else {
      // Even rows run forwards
      i = (y * kMatrixWidth) + x;
    }
  }
  return i;
}
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每米60灯黑底裸板

WS2812B
是一个集控制电路与发光电路于一体的智能外控LED光源。其外型与一个5050LED灯珠相同，每个元件即为一个像素点。像素点内部包含了智能数字接口数据锁存信号整形放大驱动电路，还包含有高精度的内部振荡器和12V高压可编程定电流控制部分，有效保证了像素点光的颜色高度一致。数据协议采用单线归零码的通讯方式，像素点在上电复位以后，DIN端接受从控制器传输过来的数据，首先送过来的24bit数据被第一个像素点提取后，送到像素点内部的数据锁存器，剩余的数据经过内部整形处理电路整形放大后通过DO端口开始转发输出给下一个级联的像素点，每经过一个像素点的传输，信号减少24bit。像素点采用自动整形转发技术，使得该像素点的级联个数不受信号传送的限制，仅仅受限信号传输速度要求。

主要特点
1、智能反接保护，电源反接不会损坏IC。
2、IC控制电路与LED点光源公用一个电源。
3、控制电路与RGB芯片集成在一个5050封装的元器件中，构成一个完整的外控像素点。
4、内置信号整形电路，任何一个像素点收到信号后经过波形整形再输出，保证线路波形畸变不会累加。
5、内置上电复位和掉电复位电路。
6、每个像素点的三基色颜色可实现256级亮度显示，完成16777216种颜色的全真色彩显示，扫描频率不低于400Hz/s。
7、串行级联接口，能通过一根信号线完成数据的接收与解码。
8、任意两点传传输距离在不超过5米时无需增加任何电路。
9、当刷新速率30帧/秒时，级联数不小于1024点。
10、数据发送速度可达800Kbps。
11、光的颜色高度一致，性价比高。
应用领域
具有低电压驱动，环保节能，亮度高，散射角度大，一致性好，超低功率，超长寿命等优点。将控制电路集成于LED上面，电路变得更加简单，体积小，安装更加简便。主要应用领域，LED全彩发光字灯串，LED全彩模组， LED全彩软灯条硬灯条，LED护栏管。LED点光源，LED像素屏，LED异形屏，各种电子产品，电器设备跑马灯等。

、

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Arduino的GND相连。

测试环境中可以直接使用Arduino的5V引脚直接供电，如果灯带长度过长，则需要外接电源。下为实验接线示意图。

实验提示
1、可以在电源到地之间连接一个电容在 100uF 到 1000uF 之间的电容器，以平滑电源。
2、在 Arduino 数字输出引脚和条形数据输入引脚之间添加一个 220 或 470 Ohm 电阻器，以减少该线路上的噪声。
3、使arduino，电源和条带之间的电线尽可能短，以最大程度地减少电压损失。
4、如果您的灯条损坏且无法正常工作，请检查第一个 LED 是否损坏。如果是这样，剪掉它，重新焊接头针，它应该会再次工作。
5、WS2812 需要 5v 电源，每个 LED 在其全亮度下需要大约 60mA 电流。如果您的 LED 灯条有 30 个 LED，您需要 60mA x 30 = 1800 mA 或 1.8 Amp 电流。因此，您必须使用额定电流为 1.8 安培或更高的 5v 电源。

打开Arduino IDE——工具——管理库，搜索并安装FastLED库

  【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
  实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩单点单控软灯条模块
  实验程序一：点亮ws2812灯带第一颗灯珠（红色闪烁）

/*
  【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
  实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩单点单控软灯条模块
  实验程序一：点亮ws2812灯带第一颗灯珠（红色闪烁）
*/

#include <FastLED.h>

#define NUM_LEDS 24
#define DATA_PIN 6
CRGB leds[NUM_LEDS];
#define BRIGHTNESS  33

void setup() {
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
}

void loop() {
  leds[0] = CRGB::Red;
  FastLED.show();
  delay(500);
  leds[0] = CRGB::Black;
  FastLED.show();
  delay(500);
}
复制代码

实验场景图  动态图

  【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
  实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩单点单控软灯条模块
  实验程序二：点亮ws2812灯带三颗灯珠（红绿蓝色）

/*
  【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
  实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩单点单控软灯条模块
  实验程序二：点亮ws2812灯带三颗灯珠（红绿蓝色）
*/

#include <FastLED.h>
#define DATA_PIN    6
#define NUM_LEDS    24
#define BRIGHTNESS  33
#define LED_TYPE    WS2812B
#define COLOR_ORDER GRB
CRGB leds[NUM_LEDS];
#define UPDATES_PER_SECOND 100

void setup() {
  FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS);
}

void loop() {
  leds[0] = CRGB::Red;
  leds[1] = CRGB::Green;
  leds[2] = CRGB::Blue;
  FastLED.show();
  delay(10);
}
复制代码

实验场景图

  【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
  实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩单点单控软灯条模块
  实验程序三：循环变色的幻彩灯带（24颗灯珠）

/*
  【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
  实验二百一十六：WS2812B幻彩LED灯带 5V全彩灯条5050灯珠内置IC炫彩单点单控软灯条模块
  实验程序三：循环变色的幻彩灯带（24颗灯珠）
*/

#include <FastLED.h>
#define NUM_LEDS 24
#define DATA_PIN 6
CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<WS2812, DATA_PIN, RGB>(leds, NUM_LEDS);
  FastLED.setBrightness(33);
}

void fadeall() {
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i].nscale8(250);
  }
}

void loop() {
  static uint8_t hue = 0;
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i] = CHSV(hue++, 255, 255);
    FastLED.show();
    fadeall();
    delay(10);
  }

  for (int i = (NUM_LEDS) - 1; i >= 0; i--) {
    leds[i] = CHSV(hue++, 255, 255);
    FastLED.show();
    fadeall();
    delay(10);
  }
}
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实验场景图  动态图

解释代码

在这里你可以看到我们首先包含了 FastLED 库。然后我们定义一些变量供以后使用。我们将使用该DATA_PIN变量来保存连接到 WS2812B LED 灯条的 Arduino 引脚号。

同样，我们NUM_LEDS用来保存您的 LED 灯条所拥有的 LED 数量。

BRIGHTNESS来控制 LED 的亮度。您可以设置 0 到 255 之间的任何亮度级别。

LED_TYPE将设置 LED 驱动器的类型。

COLOR_ORDER将设置您的 LED 驱动器的颜色顺序。

CRGB leds[NUM_LEDS];将创建一个名为 LEDs 的数组，该数组可以保存所需 LED 数量的 RGB 数据。

现在在设置部分，我们将设置我们的 LED 灯条。

FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS);
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这告诉库我们正在使用连接到 Arduino 引脚 6 的 WS2812B LED 灯条，并且驱动程序有一个 GRB LED 订单。并且灯条有 24 个 WS2812B RGB LED。

设置 RGB 颜色


我们可以通过不同的方式设置 LED 的 RGB 值。在这里，我们将看看一些流行的。

示例 1：分别从红色、绿色和蓝色分量中设置颜色

leds[i].red =    50;
leds[i].green = 100;
leds[i].blue =  150;

// ...or, using the shorter synonyms "r", "g", and "b"...
leds[i].r = 50;
leds[i].g = 100;
leds[i].b = 150;
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示例 2：一次从红色、绿色和蓝色分量中设置颜色。

leds[i] = CRGB( 50, 100, 150);
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示例 3：通过“十六进制颜色代码”（0xRRGGBB）设置颜色

leds[i] = 0xFF007F;
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示例 4：通过任何命名的 HTML 网页颜色设置颜色

leds[i] = CRGB::HotPink;
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示例 5：通过 setRGB 设置颜色

leds[i].setRGB( 50, 100, 150);
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将 CRGB 颜色从一个像素复制到另一个像素

leds[i] = leds[j];
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