Overview
Things
Story

Key features

Published December 26, 2016 © GPL3+

A Simple Arduino Based LEDs Dance To Audio Input

Making LEDs dance to audio input & dimming LEDs according to frequency of audio. It's very simple and less price.

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A Simple Arduino Based LEDs Dance To Audio Input

Things used in this project

Hardware components

Resistor 10k ohm

Resistor 100k ohm

Capacitor 10 nF

Capacitor 1 µF

Texas Instruments General Purpose Dual Op-Amp

Resistor 1k ohm

Single Turn Potentiometer- 10k ohms

2k pot is enough.

Adafruit Microphone Amplifier Breakout

General Electricite microphone is more than enough, we can make our own amplifier using above components.

Software apps and online services

Arduino IDE

Story

This project is one example of interfacing microphone with Arduino.

Key features:

To make LEDs dance to any audio input

To glow LEDs according to frequency of input audio pattern.

Instead of dual power supply amplifiers like TL082 or TL072, a general purpose LM358n IC used, which is very cheap price and its need single power supply which can provide by Arduino 5v supply source.

2k resistor pot is used at input to keep offset value above zero level. Arduino has range of 0-5v. but audio signal will be in range of -v to +v .

Before connecting to Arduino, we have to check with oscilloscope how much signal amplitude we are getting and according to that adjust 2k resistor pot in amplifier circuit. once proper signal are getting then can proceed to next level with Arduino and enjoy disco lights system of LEDs to music.

3 different color LEDs are used, which are PWM controlled (which can make LEDs to glow to a levels of input audio frequency).

delete lines of code from 43 to 100th line. Add following three lines in code to make led glowing to frequency of input audio.

                  analogWrite(Red, sound1);
                  analogWrite(Green, sound1);
                  analogWrite(Blue, sound1);

It's possible to interface many LEDs rather than three for special lighting effects.

This video shows how LEDs are dancing to music.

This is bread board connection of circuit. It seems not good but can make good on prototype models.

Code

Leds dance to audio input

/*
 Mic is connected to arduino analog pin 2. red green blue leds are connected to digital pins of arduino.
 before connecting to arduino, use oscilloscope to check the input audio signal level and offset levels. Arduino has scale range of 0-5v 
 so we need to check offset value and according to that level map analog readings.

 3,5 ,6 are Pwm pins of arduino.. so can adjust in the range of 8 bit scale..
 */

#define microphonePin A2
#define Red 3      
#define Green 5
#define Blue 6
int sound;
int sound1;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(microphonePin, INPUT);
  pinMode(Red, OUTPUT);
  pinMode(Green, OUTPUT);
  pinMode(Blue, OUTPUT);
}

void loop() {
   sound= analogRead(microphonePin);  // getting input audio signal readings
  
  Serial.print(sound);    // input audio signal readings to Serial display
  Serial.print(" ");
  if (sound>415)
  {
    sound1=map(sound,415,750,140,255);  //  mapping higher frequency values which are above offset to  the scale of 150 - 255
    }
    else if (sound>340 && sound <415)   // keeping offset reading to zero scale..here offset value in the range of 340 - 415(offset value at 1.45v) ..its depends on componets used in circuit..
    {
       sound1=map(sound,340,415,0,9);
      }
      else if (sound<340)
      {
       sound1=map(sound,0,340,10,139);// keeping below offset readings to scale of 1-139..
      }
     
      
   if(sound1>240)
        {
             digitalWrite(Red,HIGH);   // set the LEDs on
             digitalWrite(Green,HIGH);
             digitalWrite(Blue,HIGH);
        }  
        else if((sound1)>200)
        {
             digitalWrite(Red,LOW);   // set the LED off
             digitalWrite(Green,HIGH);
             digitalWrite(Blue,HIGH);
            
        }
        else if(sound1>160)
        {
             digitalWrite(Red,HIGH);   // set the LED on
             digitalWrite(Green,LOW);
             digitalWrite(Blue,HIGH);   // set the LED on
             
        }
         else if(sound1>120)
        {
             digitalWrite(Red,LOW);   // set the LED off
             digitalWrite(Green,LOW);   // set the LED off
             digitalWrite(Blue,HIGH);
             
        }
        
         else if(sound1>80)
        {
             digitalWrite(Red,HIGH);   // set the LED on
             digitalWrite(Green,HIGH);   // set the LED on
             digitalWrite(Blue,LOW);
             
        }
          else if(sound1>40)
        {
             digitalWrite(Red,LOW);   // set the LED on
             digitalWrite(Green,HIGH);   // set the LED off
             digitalWrite(Blue,LOW);
             
        }
          else if(sound1>10)
        {
             digitalWrite(Red,HIGH);   // set the LED on
             digitalWrite(Green,LOW);   // set the LED off
             digitalWrite(Blue,LOW);
             
        }
         else
        {
             digitalWrite(Red,LOW);   // set the LEDs off
             digitalWrite(Green,LOW);   // set the LEDs off
             digitalWrite(Blue,LOW);   // set the LEDs off
            
        }

  Serial.println(sound1);
 
  delay(10);
}

Credits

Babu Vaka

1 project • 0 followers

Passionate about new technologies, Want to explore as much as possible & wanna do some crazy things from scratch.

A Simple Arduino Based LEDs Dance To Audio Input