//define neopixel ring

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
  #include <avr/power.h>
#endif
#define PIN        6
#define NUMPIXELS 16

Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
#define DELAYVAL 100

//define big sound

const int MIC = 0; //the microphone amplifier output is connected to pin A0
int adc;
int dB, PdB; //the variable that will hold the value read from the microphone each time


void setup() {
Serial.begin(9600); //sets the baud rate at 9600 so we can check the values the microphone is obtaining on the Serial Monitor
  pinMode(3, OUTPUT);

#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)
  clock_prescale_set(clock_div_1);
#endif

  pixels.begin();  
}

void loop(){
  pixels.clear();

  PdB = dB; //Store the previous of dB here
  
adc= analogRead(MIC); //Read the ADC value from amplifer 
//Serial.println (adc);//Print ADC for initial calculation 
dB = (adc+83.2073) / 11.003; //Convert ADC value to dB using Regression values
  pixels.clear();



if (PdB!=dB)

//Serial.println ("les db sont de:",dB);
Serial.println (dB);







if (dB>50) //define db for turn the neopixel LED on high
{
  digitalWrite(3, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(100);                       // wait for a second
  digitalWrite(3, LOW); 


  for(int i=0; i<NUMPIXELS; i++) {

    pixels.setPixelColor(i, pixels.Color(150, 150, 0));
    pixels.show();
    delay(DELAYVAL);
    pixels.clear();

  
  }

}
//delay(100);

}