#include <SoftwareSerial.h>
#define TX 0
#define RX 1
#define soundSensor 2
SoftwareSerial mySerial(RX,TX);

const char sampleTime =50;
byte micOut;
boolean state = true;

void setup() {
  mySerial.begin(9600);
}

void loop(){
   unsigned int micOutput = findPTPAmp();
   mySerial.println(micOutput);
  /* if (micOutput>=150){
          if(state){
            mySerial.println("Led oN");
            state= false;
            }
            else {
              mySerial.println("Led off");
              state=true;
            }
    }*/
}

int findPTPAmp(){
// Time variables to find the peak-to-peak amplitude
   unsigned long startTime= millis();  // Start of sample window
   unsigned int PTPAmp = 0; 

// Signal variables to find the peak-to-peak amplitude
   unsigned int maxAmp = 0;
   unsigned int minAmp = 1023;

// Find the max and min of the mic output within the 50 ms timeframe
   while(millis() - startTime < sampleTime) 
   {
      micOut = analogRead(soundSensor);
      if( micOut < 1023) //prevent erroneous readings
      {
        if (micOut > maxAmp)
        {
          maxAmp = micOut; //save only the max reading
        }
        else if (micOut < minAmp)
        {
          minAmp = micOut; //save only the min reading
        }
      }
   }

  PTPAmp = maxAmp - minAmp; // (max amp) - (min amp) = peak-to-peak amplitude
  //double micOut_Volts = (PTPAmp * 3.3) / 1024; // Convert ADC into voltage

  //Return the PTP amplitude. 
  return PTPAmp;   
}