【花雕动手做】有趣好玩的音乐可视化系列小项目（05）---WS2812柱跳灯 简单

/*
  【花雕动手做】有趣好玩的音乐可视化系列小项目（05）---WS2812柱跳灯
  项目之一：使用MAX9814的音乐反应简单柱跳灯
*/

#include <Adafruit_NeoPixel.h>
#include <math.h>
#define N_PIXELS  8
#define MIC_PIN   A0
#define LED_PIN    6
#define SAMPLE_WINDOW   5
#define PEAK_HANG 24
#define PEAK_FALL 4
#define INPUT_FLOOR 10
#define INPUT_CEILING 50
byte peak = 16;
unsigned int sample;

byte Count = 0;
byte HangCount = 0;

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

void setup() {
  Serial.begin(9600);
  analogReference(EXTERNAL);
  strip.setBrightness(22);
  strip.show();
  strip.begin();
}

float fscale( float originalMin, float originalMax, float newBegin, float newEnd, float inputValue, float curve) {

  float OriginalRange = 0;
  float NewRange = 0;
  float zeroRefCurVal = 0;
  float normalizedCurVal = 0;
  float rangedValue = 0;
  boolean invFlag = 0;

  if (curve > 10) curve = 10;
  if (curve < -10) curve = -10;

  curve = (curve * -.1) ;
  curve = pow(10, curve);

  if (inputValue < originalMin) {
    inputValue = originalMin;
  }
  if (inputValue > originalMax) {
    inputValue = originalMax;
  }

  OriginalRange = originalMax - originalMin;

  if (newEnd > newBegin) {
    NewRange = newEnd - newBegin;
  }
  else
  {
    NewRange = newBegin - newEnd;
    invFlag = 1;
  }

  zeroRefCurVal = inputValue - originalMin;
  normalizedCurVal  =  zeroRefCurVal / OriginalRange;   // normalize to 0 - 1 float

  Serial.print(OriginalRange, DEC);
  Serial.print("   ");
  Serial.print(NewRange, DEC);
  Serial.print("   ");
  Serial.println(zeroRefCurVal, DEC);
  Serial.println();
  delay(10);

  if (originalMin > originalMax ) {
    return 0;
  }

  if (invFlag == 0) {
    rangedValue =  (pow(normalizedCurVal, curve) * NewRange) + newBegin;
  }
  else
  {
    rangedValue =  newBegin - (pow(normalizedCurVal, curve) * NewRange);
  }
  return rangedValue;
}

void loop() {
  unsigned long startMillis = millis();
  float peakToPeak = 0;

  unsigned int signalMax = 0;
  unsigned int signalMin = 1023;
  unsigned int c, y;

  while (millis() - startMillis < SAMPLE_WINDOW)
  {
    sample = analogRead(MIC_PIN);
    if (sample < 1024)
    {
      if (sample > signalMax)
      {
        signalMax = sample;
      }
      else if (sample < signalMin)
      {
        signalMin = sample;
      }
    }
  }
  peakToPeak = signalMax - signalMin;

  for (int i = 0; i <= strip.numPixels() - 1; i++) {
    strip.setPixelColor(i, Wheel(map(i, 0, strip.numPixels() - 1, 30, 150)));
  }

  c = fscale(INPUT_FLOOR, INPUT_CEILING, strip.numPixels(), 0, peakToPeak, 2);

  if (c < peak) {
    peak = c;
    HangCount = 0;
  }
  if (c <= strip.numPixels()) {
    drawLine(strip.numPixels(), strip.numPixels() - c, strip.Color(0, 0, 0));
  }

  y = strip.numPixels() - peak;
  strip.setPixelColor(y - 1, Wheel(map(y, 0, strip.numPixels() - 1, 30, 150)));
  strip.show();

  if (HangCount > PEAK_HANG) {
    if (++Count >= PEAK_FALL) {
      peak++;
      Count = 0;
    }
  }
  else {
    HangCount++;
  }
}

void drawLine(uint8_t from, uint8_t to, uint32_t c) {
  uint8_t fromTemp;
  if (from > to) {
    fromTemp = from;
    from = to;
    to = fromTemp;
  }
  for (int i = from; i <= to; i++) {
    strip.setPixelColor(i, c);
  }
}

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);
  }
}

/*
  【花雕动手做】有趣好玩的音乐可视化系列小项目（05）---WS2812柱跳灯
  项目之二：Adafruit_NeoPixel库的音乐可视化环灯
*/

#include <Adafruit_NeoPixel.h>

#define MIC A0 // 麦克风与A0相连接
#define LED_PIN 6 // LED are connected to D6
#define N_PIXELS 12 // Number of LED 
#define N 100 //样本数 
#define fadeDelay 10 // 淡出量
#define noiseLevel 15 // 降噪下限

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

int samples[N]; // 存储样本
int periodFactor = 0; // 用于周期计算
int t1 = -1;
int T;
int slope;
byte periodChanged = 0;

void setup() {
  // Serial.begin(9600);
  strip.begin();
  ledsOff();
  delay(500);
  displayColor(Wheel(100));
  strip.show();
  delay(500);
}

void loop() {
  Samples();
}

void Samples() {
  for (int i = 0; i < N; i++) {
    samples[i] = analogRead(0);
    if (i > 0) {
      slope = samples[i] - samples[i - 1];
    }
    else {
      slope = samples[i] - samples[N - 1];
    }

    if (abs(slope) > noiseLevel) {
      if (slope < 0) {
        calculatePeriod(i);
        if (periodChanged == 1) {
          displayColor(getColor(T));
        }
      }
    }
    else {
      ledsOff();
    }
    periodFactor += 1;
    delay(1);
  }
}

void calculatePeriod(int i) {
  if (t1 == -1) {

    t1 = i;
  }
  else {

    int period = periodFactor * (i - t1);
    periodChanged = T == period ? 0 : 1;
    T = period;
    // Serial.println(T);

    t1 = i;
    periodFactor = 0;
  }
}

uint32_t getColor(int period) {
  if (period == -1)
    return Wheel(0);
  else if (period > 400)
    return Wheel(5);
  else
    return Wheel(map(-1 * period, -400, -1, 50, 255));
}

void fadeOut()
{
  for (int i = 0; i < 5; i++) {
    strip.setBrightness(110 - i * 20);
    strip.show(); // Update strip
    delay(fadeDelay);
    periodFactor += fadeDelay;
  }
}

void fadeIn() {
  strip.setBrightness(100);
  strip.show();

  for (int i = 0; i < 5; i++) {
    //strip.setBrightness(20*i + 30);
    //strip.show();
    delay(fadeDelay);
    periodFactor += fadeDelay;
  }
}

void ledsOff() {
  fadeOut();
  for (int i = 0; i < N_PIXELS; i++) {
    strip.setPixelColor(i, 0, 0, 0);
  }
}

void displayColor(uint32_t color) {
  for (int i = 0; i < N_PIXELS; i++) {
    strip.setPixelColor(i, color);
  }
  fadeIn();
}

uint32_t Wheel(byte WheelPos) {
  // Serial.println(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);
  }
}

/*
  【花雕动手做】有趣好玩的音乐可视化系列小项目（05）---WS2812柱跳灯
  项目之三：十六位直条WS2812音乐可视化柱灯
*/

#include <Adafruit_NeoPixel.h>

#define N_PIXELS  16  // Number of pixels in strand

#define MIC_PIN   A0  // Microphone is attached to this analog pin

#define LED_PIN    6  // NeoPixel LED strand is connected to this pin

#define DC_OFFSET  0  // DC offset in mic signal - if unusure, leave 0

#define NOISE     300  // Noise/hum/interference in mic signal

#define SAMPLES   50  // Length of buffer for dynamic level adjustment

#define TOP       (N_PIXELS + 2) // Allow dot to go slightly off scale

#define PEAK_FALL 60  // Rate of peak falling dot


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       = 100,      // Current "dampened" audio level

    minLvlAvg = 0,      // For dynamic adjustment of graph low & high

    maxLvlAvg = 512;

Adafruit_NeoPixel

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



void setup() {

  // This is only needed on 5V Arduinos (Uno, Leonardo, etc.).

  // Connect 3.3V to mic AND TO AREF ON ARDUINO and enable this

  // line.  Audio samples are 'cleaner' at 3.3V.

  // COMMENT OUT THIS LINE FOR 3.3V ARDUINOS (FLORA, ETC.):
  
  analogReference(EXTERNAL);

  memset(vol, 0, sizeof(vol));

  strip.setBrightness(66);

  strip.begin();

}

void loop() {

  uint8_t  i;

  uint16_t minLvl, maxLvl;

  int      n, height;

  n   = analogRead(MIC_PIN);   // Raw reading from mic

  n   = abs(n - 512 - DC_OFFSET); // Center on zero

  n   = (n <= NOISE) ? 0 : (n - NOISE);             // Remove noise/hum

  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);

  }

}