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RGB marix led点阵屏--蓝牙音乐频谱播放器

黑色点阵金属边框的深沉feel，幽兰迷离等效曲风自然跳跃的 new york city。
这一切的全部归结于RGB matrix led点阵屏
RGB marix led点阵屏--蓝牙音乐频谱播放器图1

准备工作：
IDC转接线                                                             x1
电源连接线                                                             x1
Arduino uno                               x132x16
RGB LED Matrix - 6mm pitch 点阵屏       x1
接口说明：
RGB marix led点阵屏--蓝牙音乐频谱播放器图2

测试电路连线：

示例代码：

// scrolltext demo for Adafruit RGBmatrixPanel library.
// Demonstrates double-buffered animation on our 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 <Adafruit_GFX.h>   // Core graphics library
#include <RGBmatrixPanel.h> // Hardware-specific library

// Similar to F(), but for PROGMEM string pointers rather than literals
#define F2(progmem_ptr) (const __FlashStringHelper *)progmem_ptr

#define CLK 8  // MUST be on PORTB! (Use pin 11 on Mega)
#define LAT A3
#define OE  9
#define A   A0
#define B   A1
#define C   A2
// Last parameter = 'true' enables double-buffering, for flicker-free,
// buttery smooth animation.  Note that NOTHING WILL SHOW ON THE DISPLAY
// until the first call to swapBuffers().  This is normal.
RGBmatrixPanel matrix(A, B, C, CLK, LAT, OE, true);
// Double-buffered mode consumes nearly all the RAM available on the
// Arduino Uno -- only a handful of free bytes remain.  Even the
// following string needs to go in PROGMEM:

const char str[] PROGMEM = "DFRobot";
int    textX   = matrix.width(),
       textMin = sizeof(str) * -12,
       hue     = 0;
int8_t ball[3][4] = {
  {  3,  0,  1,  1 }, // Initial X,Y pos & velocity for 3 bouncy balls
  { 17, 15,  1, -1 },
  { 27,  4, -1,  1 }
};
static const uint16_t PROGMEM ballcolor[3] = {
  0x0080, // Green=1
  0x0002, // Blue=1
  0x1000  // Red=1
};

void setup() {
  matrix.begin();
  matrix.setTextWrap(false); // Allow text to run off right edge
  matrix.setTextSize(2);
}

void loop() {
  byte i;

  // Clear background
  matrix.fillScreen(0);

  // Bounce three balls around
  for(i=0; i<3; i++) {
    // Draw 'ball'
    matrix.fillCircle(ball
[0], ball
[1], 5, pgm_read_word(&ballcolor
));
    // Update X, Y position
    ball
[0] += ball
[2];
    ball
[1] += ball
[3];
    // Bounce off edges
    if((ball
[0] == 0) || (ball
[0] == (matrix.width() - 1)))
      ball
[2] *= -1;
    if((ball
[1] == 0) || (ball
[1] == (matrix.height() - 1)))
      ball
[3] *= -1;
  }

  // Draw big scrolly text on top
  matrix.setTextColor(matrix.ColorHSV(hue, 255, 255, true));
  matrix.setCursor(textX, 1);
  matrix.print(F2(str));

  // Move text left (w/wrap), increase hue
  if((--textX) < textMin) textX = matrix.width();
  hue += 7;
  if(hue >= 1536) hue -= 1536;

  // Update display
  matrix.swapBuffers(false);
}
复制代码

演示效果：

32x32 RGB LED Matrix - 4mm pitch 点阵屏

线路连接：

演示效果：

Rgb matrix panel库函数:
RGBmatrixPannel::color333(uint8_t r, uint8_t  g, uint8_t b)
//promote 3/3/3 rgb to adafruit_gfx 5/6/5 将3/3/3颜色比例转换为5/6/5
RRRGGGBBB->RRRrrGGGgggBBBbb
类似color444(uint8_t r, uint8_t  g, uint8_t b)；
   color888(uint8_t r, uint8_t  g, uint8_t b)；
选用color888 r/g/b8为 2的8次方等于256，方便对照rgb颜色对照表；

Fillscreen（uint16_t c) 填充屏幕c
Colorhsv 由rgb到hsv颜色空间的理解：
Drawpixel（int16_t x, int16_t y, uint16_t c) 绘制像素点
由于需要在arduino上进行声音处理，就需要FFT变换（快速傅里叶变换）
.  傅里叶变化概念
.  复数的概念
.  欧拉公式
好像记忆里大学的信号的数据分析原理以及通讯原理讲过；
蓝牙音频的接口电路示意图如上；

我们还用到arduino mega2560进行控制和fft转换

接线细节如下：