【花雕动手做】有趣好玩的音乐可视化系列小项目（06）---点阵频谱灯 简单

/*
【花雕动手做】音乐可视化系列小项目（06）---点阵频谱灯
项目之一：八段分频8X8点阵屏的音乐频谱灯
接脚连线：MAX9814 接A0
MAX7219 UNO
VCC →→→→→ 5V
GND →→→→→ GND
DIN →→→→→ D12（数据，数据接收引脚）
CS →→→→→ D11（负载，命令接收引脚）
CLK →→→→→ D10（时钟，时钟引脚）
*/

#include "LedControl.h"

/* Led matrix - Max7219 Declared */
LedControl lc = LedControl(12, 11, 10, 1);

const int maxScale = 11;

/* Sensor - Max9812 Declared */
const int sensorPin = A4;
const int sampleWindow = 50; // 50ms = 20Hz
unsigned int sample;

unsigned long startMillis;
unsigned long timeCycle;

unsigned int signalMax = 0;
unsigned int signalMin = 1024;
unsigned char index = 0;

unsigned int peakToPeak[8];
unsigned int displayPeak[8];
unsigned int temp[8]={0,0,0,0,0,0,0,0};
unsigned int signalMaxBuff[8];
unsigned int signalMinBuff[8];


void setup() {
// Led matrix
lc.shutdown(0, false); // bật hiện thị
lc.setIntensity(0, 1); // chỉnh độ sáng
lc.clearDisplay(0); // tắt tất cả led

Serial.begin(9600);
}

void loop() {
startMillis = millis();
//peakToPeak = 0;

signalMax = 0;
signalMin = 1024;

// Get data in 50ms
while (millis() - startMillis < sampleWindow) {
sample = analogRead(sensorPin);

if (sample < 1024) {
if (sample > signalMax) {
signalMax = sample;
}
if (sample < signalMin) {
signalMin = sample;
}
}

// 20Hz - 64Hz - 125Hz - 250Hz - 500Hz - 1kHz (timeCycle = 1/F)(ms)
timeCycle = millis() - startMillis;
if (timeCycle == 1 || timeCycle == 2 || timeCycle == 4 || timeCycle == 8
|| timeCycle == 16 || timeCycle == 32 || timeCycle == 40 || timeCycle == 50) {
signalMaxBuff[index] = signalMax;
signalMinBuff[index] = signalMin;
index = (index + 1) % 8;
delay(1);
//Serial.println(timeCycle);
}
}

// Delete pointer to array
index = 0;

// Calculation after get samples
for (int i = 0; i < 8; i++) { // i = row (led matrix)
// sound level
peakToPeak[i] = signalMaxBuff[i] - signalMinBuff[i];

// Map 1v p-p level to the max scale of the display
displayPeak[i] = map(peakToPeak[i], 0, 1023, 0, maxScale);

// Show to led matrix
displayLed(displayPeak[i], i);

// Led drop down
if (displayPeak[i] >= temp[i]) {
temp[i] = displayPeak[i];
}
else {
temp[i]--;
}

lc.setLed(0, i, temp[i], true);
delayMicroseconds(250);
}

}

void displayLed(int displayPeak, int row) {
switch (displayPeak) {
case 0 : lc.setRow(0, row, 0x80); break;
case 1 : lc.setRow(0, row, 0xC0); break;
case 2 : lc.setRow(0, row, 0xE0); break;
case 3 : lc.setRow(0, row, 0xF0); break;
case 4 : lc.setRow(0, row, 0xF8); break;
case 5 : lc.setRow(0, row, 0xFC); break;
case 6 : lc.setRow(0, row, 0xFE); break;
case 7 : lc.setRow(0, row, 0xFF); break;
}
}

/*
 【花雕动手做】音乐可视化系列小项目（06）---点阵频谱灯
 项目之二：FFT算法，八段音乐可视化动态频谱仪
*/

#include <arduinoFFT.h>

#include <MD_MAX72xx.h>

#include <SPI.h>

MD_MAX72XX disp = MD_MAX72XX(MD_MAX72XX::FC16_HW, 10, 4);

arduinoFFT FFT = arduinoFFT();

double realComponent[64];

double imagComponent[64];

int spectralHeight[] = {0b00000000,0b10000000,0b11000000,

                        0b11100000,0b11110000,0b11111000,

                        0b11111100,0b11111110,0b11111111};

int index, c, value;

void setup()

{

  disp.begin();

  Serial.begin(9600);

}

void loop()

{

  int sensitivity = map(analogRead(A6),0,1023,50,100); 

  Serial.println (analogRead(A6));

  for(int i=0; i<64; i++)

  {

    realComponent[i] = analogRead(A7)/sensitivity;

    imagComponent[i] = 0;

  }

  FFT.Windowing(realComponent, 64, FFT_WIN_TYP_HAMMING, FFT_FORWARD);

  FFT.Compute(realComponent, imagComponent, 64, FFT_FORWARD);

  FFT.ComplexToMagnitude(realComponent, imagComponent, 64);

  for(int i=0; i<32; i++)

  {

    realComponent[i] = constrain(realComponent[i],0,80);

    realComponent[i] = map(realComponent[i],0,80,0,8);

    index = realComponent[i];

    value = spectralHeight[index];

    c = 31 - i;

    disp.setColumn(c, value);

  }

}

/*
  【花雕动手做】音乐可视化系列小项目（06）---点阵频谱灯
  项目之三：arduinoFFT浮点频谱灯
*/

#include <arduinoFFT.h>
#include <MD_MAX72xx.h>
#include <SPI.h>

#define SAMPLES 64            
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW   
#define MAX_DEVICES  4   
#define CLK_PIN   13  
#define DATA_PIN  11  
#define CS_PIN    10  
#define  xres 32      
#define  yres 8       


int MY_ARRAY[]={0, 128, 192, 224, 240, 248, 252, 254, 255}; 
int MY_MODE_1[]={0, 128, 192, 224, 240, 248, 252, 254, 255}; 
int MY_MODE_2[]={0, 128, 64, 32, 16, 8, 4, 2, 1}; 
int MY_MODE_3[]={0, 128, 192, 160, 144, 136, 132, 130, 129}; 
int MY_MODE_4[]={0, 128, 192, 160, 208, 232, 244, 250, 253}; 
int MY_MODE_5[]={0, 1, 3, 7, 15, 31, 63, 127, 255}; 

 
double vReal[SAMPLES];
double vImag[SAMPLES];
char data_avgs[xres];

int yvalue;
int displaycolumn , displayvalue;
int peaks[xres];
const int buttonPin = 2;    
int state = HIGH;             
int previousState = LOW;   
int displaymode = 1;
unsigned long lastDebounceTime = 0;  
unsigned long debounceDelay = 50;    


MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);   
arduinoFFT FFT = arduinoFFT();                                    
 


void setup() {
    
    ADCSRA = 0b11100101;      
    ADMUX = 0b00000000;       
    pinMode(buttonPin, INPUT);
    mx.begin();           
    delay(50);            
}
 
void loop() {
   // ++ Sampling
   for(int i=0; i<SAMPLES; i++)
    {
      while(!(ADCSRA & 0x10));        
      ADCSRA = 0b11110101 ;               
      int value = ADC - 512 ;                 
      vReal[i]= value/8;                      
      vImag[i] = 0;                         
    }
  
    FFT.Windowing(vReal, SAMPLES, FFT_WIN_TYP_HAMMING, FFT_FORWARD);
    FFT.Compute(vReal, vImag, SAMPLES, FFT_FORWARD);
    FFT.ComplexToMagnitude(vReal, vImag, SAMPLES);
   
    int step = (SAMPLES/2)/xres; 
    int c=0;
    for(int i=0; i<(SAMPLES/2); i+=step)  
    {
      data_avgs[c] = 0;
      for (int k=0 ; k< step ; k++) {
          data_avgs[c] = data_avgs[c] + vReal[i+k];
      }
      data_avgs[c] = data_avgs[c]/step; 
      c++;
    } 
     
    for(int i=0; i<xres; i++)
    {
      data_avgs[i] = constrain(data_avgs[i],0,80);            
      data_avgs[i] = map(data_avgs[i], 0, 80, 0, yres);       
      yvalue=data_avgs[i];

      peaks[i] = peaks[i]-1;    
      if (yvalue > peaks[i]) 
          peaks[i] = yvalue ;
      yvalue = peaks[i];    
      displayvalue=MY_ARRAY[yvalue];
      displaycolumn=15-i;
      mx.setColumn(displaycolumn, displayvalue);              
     }   
     
    displayModeChange ();         
} 

void displayModeChange() {
  int reading = digitalRead(buttonPin);
  if (reading == HIGH && previousState == LOW && millis() - lastDebounceTime > debounceDelay) 
  
  {

   switch (displaymode) {
    case 1:    
      displaymode = 2;
      for (int i=0 ; i<=8 ; i++ ) {
        MY_ARRAY[i]=MY_MODE_2[i];
      }
      break;
    case 2:    
      displaymode = 3;
      for (int i=0 ; i<=8 ; i++ ) {
        MY_ARRAY[i]=MY_MODE_3[i];
      }
      break;
    case 3:    
      displaymode = 4;
      for (int i=0 ; i<=8 ; i++ ) {
        MY_ARRAY[i]=MY_MODE_4[i];
      }
      break;
    case 4:    
      displaymode = 5;
      for (int i=0 ; i<=8 ; i++ ) {
        MY_ARRAY[i]=MY_MODE_5[i];
      }
      break;
    case 5:    
      displaymode = 1;      
      for (int i=0 ; i<=8 ; i++ ) {
        MY_ARRAY[i]=MY_MODE_1[i];
      }
      break;
  }

    lastDebounceTime = millis();
  }
  previousState = reading;
}