Introduction: Sound Reactive Light Cube , Featured in Hackspace


Today we are going to make a sound Reactive wooden cube. Which will be changing color in perfect sync to the surrounding sounds or vibration.

Featured in #Hackspace 16th issue

Hardware required

  • Arduino Nano
  • Addressable UCS1903B DC5V
  • Mic based Sound Sensor Module
  • White Wood Cube


The sounds will be picked by the mic module and will be amplified and fed to the Arduino analog pin, we will read the analog pin values and using the fastLED library we will change the colors of the LEDs randomly according to the received values from the mic.

Step 1: Construction

Pictures speak 1000 words

Step 2: Schematics

Step 3: Programming

Download code from GitHub

#include "FastLED.h" //fast led library

#define NUM_LEDS 10 //total no. of leds used

#define DATA_PIN 5 //digital pin at which the data pin is connected

#define mic A5 //analog input from mic module

int mic_Value; //to save raw value from mic

int red, green, blue; //to store RGB color values

CRGB leds[NUM_LEDS]; //fast led function
void setup()

FastLED.addLeds(leds, NUM_LEDS); //as our led IC is UCS1903B,fast led support lots of ICs, find more

//FastLED.addLeds(leds, NUM_LEDS); //if you are using WS2812B insted of UCS1903B

LEDS.setBrightness(200); //setting brightness of LED (0 to 255) //info at

randomSeed(analogRead(0));// for generating random no. by taking noise from analog pin 0

for (int i = 0; i <= 9; i++) //for changing color of all 10 LEDs


leds[i] = CRGB(200, 200, 200); //for initial white color; //fastled function, without this function the colors won't be updated


} void loop()


mic_Value = analogRead(mic); //storing analog values from mic to mic_value

if(mic_Value>100) //to avoid small noise


for(int i=0;i<=9;i++)//for changing color of all 10 LEDs


red=random(255); //random red color value between 0 to 255

green=random(255); //random green color value between 0 to 255

blue=random(255); //random blue color value between 0 to 255

leds[i]=CRGB(red,green,blue); //assigning color values to LEDs;




Step 4: Testing

Step 5: Full Video Tutorial