Introduction

This music responsible IQ light string is an application based on an individually addressable LED strip. It can turn into other different products if you want to. All you have to do is to change the outside wrapper. It's googd choice to be a decoration in your friends' party, Children's room, or date with candlelight dinner and romantic pas de deux. .. ^^

What you’ll need

Audio Analyzer*1
Analog sound sensor*2
RGB individually addressable LED strip *1
Beetle - The Smallest Arduino Microcontroller *1

Connection
You can connect different components together based on the diagram below:

/*music responsible led strip sample code
created by Yu Sun on 07/28/2015
*/
 
#include <Adafruit_NeoPixel.h>
#include <AudioAnalyzer.h>
 
#define PIN 11     //The signal pin connected with Arduino   
#define LED_COUNT 34 //total number of leds in the strip
#define NOISE 120// noise that you want to chrop off
#define SEG 6 // how many parts you want to seperate the led strip into
 
Analyzer Audio = Analyzer(10,9,0);//Strobe pin ->10  RST pin ->9 Analog Pin ->0
 
Adafruit_NeoPixel leds = Adafruit_NeoPixel(LED_COUNT, PIN, NEO_GRB + NEO_KHZ800);
 
int FreqVal[7];//create an array to store the value of different freq
 
void setup()
{
  Serial.begin(57600);
  Audio.Init();
  leds.begin();  // Call this to start up the LED strip.
  clearLEDs();   // This function, defined below, turns all LEDs off...
  leds.show();   // ...but the LEDs don't actually update until you call this.
}
 
void loop(){
  Audio.ReadFreq(FreqVal);
  for (int i = 0;i<7;i++){
    FreqVal[i]=constrain(FreqVal[i],NOISE,1023);
     FreqVal[i]=map( FreqVal[i],NOISE,1023,0,255);
     Serial.print(FreqVal[i]);//used for debugging and Freq choosing
    Serial.print(" ");
  }
  int j;
  //assign different values for different parts of the led strip
  for (j=0;j<LED_COUNT;j++){
    if(0<=j && j<=LED_COUNT/7)
    {
      set(j,FreqVal[1]);// set the color of led
      leds.show();
     delay(1.5);// to make the led transit color more naturally
    }
    else if((LED_COUNT/SEG)<=j && j<(LED_COUNT/SEG*2))
    {
      set(j,FreqVal[1]);
      leds.show();
      delay(1.5);
    }
    else if((LED_COUNT/SEG*2)<=j&& j<(LED_COUNT/SEG*3)){
       set(j,FreqVal[3]);
       leds.show();
       delay(1.5);
    }
    else if((LED_COUNT/SEG*3)<=j&& j<(LED_COUNT/SEG*4)){
       set(j,FreqVal[4]);
       leds.show();
       delay(1.5);
    }
    else if((LED_COUNT/SEG*4)<=j&& j<(LED_COUNT/SEG*5)){
      set(j,FreqVal[3]);
      leds.show();
      delay(1.5);
    }
    else{
      set(j,FreqVal[2]);
      leds.show();
      delay(1.5);
    }
   
  }
 
    }
 
//the following function set the led color based on its position and freq value
void set(byte position, int value){
 
  if(0<=position&& position<LED_COUNT/SEG){
     leds.setPixelColor(position,leds.Color(position*15+value*15,position*5+value*6,0));
 
    }
  else if(LED_COUNT/SEG<=position && position<LED_COUNT/SEG*2){
     leds.setPixelColor(position,leds.Color(position*5+value*5,value+position*2,0));
   
    }
   else if(LED_COUNT/SEG*2<=position&& position<LED_COUNT/SEG*3){
     leds.setPixelColor(position,leds.Color(value*5+position*3,value*4+position*2,0));
   
    }
     else if(LED_COUNT/SEG*3<=position&& position<LED_COUNT/SEG*4){
     leds.setPixelColor(position,leds.Color(0,value*8+position,position*0.96+value*2));
   
   
    }
     else if(LED_COUNT/SEG*4<=position&& position<LED_COUNT/SEG*5){
    leds.setPixelColor(position,leds.Color(0,(value*2+position*0.2)*3,(value+position*0.5)*3));
   
    }
    else{
    leds.setPixelColor(position,leds.Color(value*0.4+position*0.8,value*0.3,value*0.5+position*0.2));
   
    }
  
   
}
 
void clearLEDs()
{
  for (int i=0; i<LED_COUNT; i++)
  {
    leds.setPixelColor(i, 0);
  }
  
 
}

That’s it! Enjoy the sights and sounds!