#define mic 7
#define LED 13

unsigned long T1=0;
int c=0;   //counter
bool state=0;

void setup(){ 
  Serial.begin(9600);
  pinMode(LED,OUTPUT);
  }
void loop(){
  if( millis()> (T1+5500)){ c=0; }
  if(digitalRead(mic)==1  && millis()> (T1+5000)){T1=millis(); c=1; }
  if(digitalRead(mic)==1  && millis()> (T1+500) && millis()< (T1+5000)){T1=millis(); c=c+1;}
  if( millis() > (T1+5000) && c==2)  {state = !state ; c=0; digitalWrite(LED,state);}
  
  Serial.println(c);
  
}