#情人节#--像素范 , 蓝牙播放器

#define LOG_OUT 1 // use the log output function
#define FFT_N 256 // FFT采样数：16.32.64.128.256
//#define DEBUG
#include <FFT.h> //快速傅里叶转换头文件声明
#include <Adafruit_GFX.h>   // Core graphics library
#include <RGBmatrixPanel.h> // Hardware-specific library

#define Cycle 3 //因为单次采样会有极大的噪音干扰，故用多次采样取平均值的方法
#define SIZE_WIDTH 32    //rgb显示宽度
//#define MAX_SPECTRUM 32 
#define GAIN 2.3
//#define FREQUENCY_INDEX(I) ((I)*3 + 10)
int Spectrum[SIZE_WIDTH];//数组记录多次采样值并在最后取平均数
// Similar to F(), but for PROGMEM string pointers rather than literals
//#define F2(progmem_ptr) (const __FlashStringHelper *)progmem_ptr
#define CLK 11 // MUST be on PORTB! (Use pin 11 on Mega)
#define LAT A3
#define OE  9
#define A   A4
#define B   A1
#define C   A2
RGBmatrixPanel matrix(A, B, C, CLK, LAT, OE, false);
const unsigned char myBitmap [] PROGMEM = {
  // 'Designbolts-Free-Valentine-Heart-Heart, 16x16px
  0x00, 0x00, 0x1c, 0x38, 0x7e, 0x7e, 0x7f, 0xfe, 0x7f, 0xfe, 0x7f, 0xfe, 0x7f, 0xfe, 0x7f, 0xfe, 
  0x3f, 0xfc, 0x1f, 0xf8, 0x1f, 0xf8, 0x0f, 0xf0, 0x03, 0xc0, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 
};
void setup() {
   Serial.begin(115200); // use the serial port
   TIMSK0 = 0; // turn off timer0 for lower jitter - delay() and millis() killed
   ADCSRA = 0xe5; // set the adc to free running mode
   ADMUX = 0x40; // use adc0
   DIDR0 = 0x01; // turn off the digital input for adc0

   matrix.begin();
//           matrix.fillScreen(matrix.Color888(0, 150, 255));
//while(true);
 }
 
void loop() {
  int ave;
//  matrix.fillScreen(0);
  for (int m=0;m<SIZE_WIDTH;m++){
    Spectrum[m]=0;
  }
  for (int n=0;n<Cycle;n++){   //n记录采样次数
  //while(1) { // reduces jitter
    for (int i = 0 ; i < 512 ; i += 2) { // save 256 samples
         // cli();  // UDRE interrupt slows this way down on arduino1.0
      while(!(ADCSRA & 0x10)); // wait for adc to be ready
        ADCSRA = 0xf5; // restart adc
        byte m = ADCL; // fetch adc data
        byte j = ADCH;
         int k = (j << 8) | m; // form into an int
         k -= 0x0200; // form into a signed int
         k <<= 6; // form into a 16b signed int
         fft_input<i> = k; // put real data into even bins
         fft_input[i+1] = 0; // set odd bins to 0
       }
            // sei(); // turn interrupts back on
       // window data, then reorder, then run, then take output
       fft_window(); // window the data for better frequency response
       fft_reorder(); // reorder the data before doing the fft
       fft_run(); // process the data in the fft
       fft_mag_log(); // take the output of the fft
      /* for (byte i = 0 ; i < FFT_N/2 ; i++) 
       { 
          Serial.println(fft_log_out<i>); // <--输出到串口  
       }*/
       //Serial.write(255); // send a start byte
       //Serial.write(fft_log_out, 128); // send out the data
      }


      
      static int times = 0;

        if(times++ == 0){
          times=0;
                for(int m=0;m<SIZE_WIDTH;m++){
        ave=0;
        for (byte i=m*4;i<(m+1)*4;i++){
          ave+=fft_log_out<i>;
        }
        ave/=4;
        ave/=2;
        Spectrum[m]=ave;
        Spectrum[m]/=Cycle;
        Serial.print(Spectrum[m]);
        Serial.print("-");
        if (m ==15)
        {
          Serial.println("||");
        }
        
          Spectrum[0] = Spectrum[1]-22;
          //Spectrum[1] = Spectrum[1]-7;
          //Spectrum[2] = Spectrum[2]-6;
          //Spectrum[3] = Spectrum[3]-6;
         
          
        int y = Spectrum[m]-8;
        if(y>26)
        y = 15;
        
        /*if(y<=7){
          
           //y = 0;
           matrix.fillScreen(0);
        }*/
        
       matrix.drawLine(m, 0, m, y, matrix.Color888(0, 150, 255));
       matrix.drawLine(m, y+1, m, 15, matrix.Color888(0, 0, 0));
      }
        }
   
}</i></i></i>
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如何制作表情（图形）？

取模软件：

// 'Designbolts-Free-Valentine-Heart-Heart', 16x16px
const unsigned char myBitmap [] PROGMEM = {
 0xff, 0xff, 0xe3, 0xc7, 0x81, 0x81, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 
 0xc0, 0x03, 0xe0, 0x07, 0xe0, 0x07, 0xf0, 0x0f, 0xfc, 0x3f, 0xfe, 0x7f, 0xff, 0xff, 0xff, 0xff
};
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#include <Adafruit_GFX.h>
#include <Adafruit_SPITFT.h>
#include <Adafruit_SPITFT_Macros.h>
#include <gfxfont.h>

// testshapes demo for Adafruit RGBmatrixPanel library.
// Demonstrates the drawing abilities of the RGBmatrixPanel library.
// For 16x32 RGB LED matrix:
// <a href="http://www.adafruit.com/products/420" target="_blank">http://www.adafruit.com/products/420</a>

// Written by Limor Fried/Ladyada & Phil Burgess/PaintYourDragon
// for Adafruit Industries.
// BSD license, all text above must be included in any redistribution.


#include <RGBmatrixPanel.h> // Hardware-specific library

#define CLK 11  // MUST be on PORTB! (Use pin 11 on Mega)
#define LAT A4
#define OE  9
#define A   A0
#define B   A1
#define C   A2
RGBmatrixPanel matrix(A, B, C, CLK, LAT, OE, false);
 // 'Designbolts-Free-Valentine-Heart-Heart', 16x16px
const unsigned char myBitmap [] PROGMEM = {
  0xff, 0xff, 0xe3, 0xc7, 0x81, 0x81, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 
  0xc0, 0x03, 0xe0, 0x07, 0xe0, 0x07, 0xf0, 0x0f, 0xfc, 0x3f, 0xfe, 0x7f, 0xff, 0xff, 0xff, 0xff
};

void setup() {

  matrix.begin();
  matrix.drawBitmap(0,0,myBitmap,16,16,0xff);
  
}

void loop() {
  // do nothing
}
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