/****************************************

Example Sound Level Sketch for the 

Adafruit Microphone Amplifier

modified for GEMMA sequin masquerade mask

****************************************/

//Modifications by Julie Barrett for the sound reactive hat project

const int sampleWindow = 50; // Sample window width in mS (50 mS = 20Hz)

unsigned int sample;

int led = 1;           // the pin that the LED is attached to

int brightness = 0;    // how bright the LED is

void setup() 

{

   //Serial.begin(9600);

     pinMode(led, OUTPUT);

}

void loop() 

{

   unsigned long startMillis= millis();  // Start of sample window

   unsigned int peakToPeak = 0;   // peak-to-peak level

   unsigned int signalMax = 0;

   unsigned int signalMin = 1024;

   // collect data for 50 mS

   while (millis() - startMillis < sampleWindow)

   {

      sample = analogRead(1);

      //Serial.println(sample);

      if (sample < 1024)  // toss out spurious readings

      {

         if (sample > signalMax)

         {

            signalMax = sample;  // save just the max levels

         }

         else if (sample < signalMin)

         {

            signalMin = sample;  // save just the min levels

         }

      }

   }

   peakToPeak = (signalMax - signalMin)6;  // max - min = peak-peak amplitude

   double volts = (peakToPeak * 3.3) / 1024;  // convert to volts

    int brightness = map(peakToPeak, 0, 1023, 0, 255);

    analogWrite(led, brightness);

   //Serial.println(volts);

}