【零知小项目】Firmata与Processing 实现音乐LED炫酷灯光效果
在这里使用零知标准板和Processing通过Firmata通信，实现了音乐LED炫酷的效果。1、硬件
[*]零知标准板
[*]RGB彩色LED 3个
[*]电阻-220Ω-9个
硬件连接
2、软件
软件方面需要零知-标准板程序和Processing程序，它们之间通过Firmata通信；
（1）零知-标准板
安装Firmata的库后，打开示例StandardFirmata程序，如下操作：
1、安装Firmata库（请到零知官网查看原帖）
或者复制如下代码：
详细代码：请至零知官网查看同名原帖然后验证程序并上传到零知-标准板。
（2）Processing程序
Processing程序主要使用Firmata库和Minim库，然后把音乐通过FFT计算并转换为PWM值，这个值再通过Firmata Arduino设置对应LED的引脚PWM值，就能显示各种颜色。
import ddf.minim.*;
import ddf.minim.analysis.*;
import processing.serial.*;
import cc.arduino.*;
Arduino arduino;
Minim minim;
AudioPlayer song;
FFT fft;
int redPin1 = 0;
int greenPin1 = 1;
int bluePin1 = 2;
int redPin2 = 3;
int greenPin2 = 5;
int bluePin2 = 6;
int redPin3 = 9;
int greenPin3 = 11;
int bluePin3 = 12;
int LED_PINS[] = {redPin1,greenPin1,bluePin1,redPin2,greenPin2,bluePin2,redPin3,greenPin3,bluePin3};
int color_id = 0;
int common_cathode = 0;
void setup() {
size(800, 600);
arduino = new Arduino(this, "COM7", 57600);
for (int i = 0; i <= 8; i++) arduino.pinMode(LED_PINS, Arduino.PWM);
for (int i = 0; i <= 8; i++) arduino.analogWrite(LED_PINS,255);
minim = new Minim(this);
song = minim.loadFile("badapple.mp3");
song.play();
fft = new FFT(song.bufferSize(), song.sampleRate());
}
void draw() {
background(#151515);
fft.forward(song.mix);
strokeWeight(1.3);
stroke(#FFF700);
// frequency
pushMatrix();
translate(250, 0);
for(int i = 0; i < 0+fft.specSize(); i++) {
line(i, height*4/5, i, height*4/5 - fft.getBand(i)*4);
if(i%100==0) text(fft.getBand(i), i, height*4/5+20);
if(i==200) {
if(fft.getBand(i)>2) {
setColor1(255,255,0);
setColor3(255,255,0);
}
else if(fft.getBand(i)>1) {
setColor1(255,0,255);
setColor3(255,0,255);
} else {
setColor1(255,255,255);
setColor3(255,255,255);
}
}
if(i==50) {
if(fft.getBand(i)>5) {
color_id = (color_id+1)%4;
} else if(fft.getBand(i)>3) {
if(color_id==0) setColor2(0,255,0);
else if(color_id==1) setColor2(0,255,255);
else if(color_id==2) setColor2(0,0,255);
else setColor2(255,0,0);
}
else {
setColor2(255,255,255);
}
}
}
popMatrix();
stroke(#FF0000);
//waveform
for(int i = 250; i < song.left.size() - 1; i++) {
line(i, 50 + song.left.get(i)*50, i+1, 50 + song.left.get(i+1)*50);
line(i, 150 + song.right.get(i)*50, i+1, 150 + song.right.get(i+1)*50);
line(i, 250 + song.mix.get(i)*50, i+1, 250 + song.mix.get(i+1)*50);
}
noStroke();
fill(#111111);
rect(0, 0, 250, height);
textSize(24);
fill(#046700);
text("left amplitude", 10, 50);
text("right amplitude", 10, 150);
text("mixed amplitude", 10, 250);
text("frequency", 10, height*4/5);
}
void stop()
{
for (int i = 0; i <= 13; i++) arduino.digitalWrite(i,arduino.HIGH);
song.close();
minim.stop();
super.stop();
}
void setColor1(int red, int green, int blue)
{
if(common_cathode==1) {
red = 255-red;
green = 255-green;
blue = 255-blue;
}
arduino.analogWrite(redPin1, red);
arduino.analogWrite(greenPin1, green);
arduino.analogWrite(bluePin1, blue);
}
void setColor2(int red, int green, int blue)
{
if(common_cathode==1) {
red = 255-red;
green = 255-green;
blue = 255-blue;
}
arduino.analogWrite(redPin2, red);
arduino.analogWrite(greenPin2, green);
arduino.analogWrite(bluePin2, blue);
}
void setColor3(int red, int green, int blue)
{
if(common_cathode==1) {
red = 255-red;
green = 255-green;
blue = 255-blue;
}
arduino.analogWrite(redPin3, red);
arduino.analogWrite(greenPin3, green);
arduino.analogWrite(bluePin3, blue);
}
这里需要注意的是，需要在Processing程序里面更改你的板子对应COM口，和你需要播放的音乐名（和sketch同一级目录）。
完整程序如下：（请至零知官网查看同名原帖）
3、测试验证
在我们连接好零知板与LED等的连线并上传好程序后，我们再打开Processing程序并运行，就可以看到播放音乐的时候炫酷的LED灯光效果了。
查看完整效果视频： http://www.lingzhilab.com/forum.html?mod=redirect&goto=findpost&ptid=1074&pid=5052&fromuid=3010
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