int ledDelay=2000;
void setup() {
  pinMode(A0, INPUT);
  pinMode(6, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(2, OUTPUT);

}

void loop() {
  int a=analogRead(0);
  a*=0.0048;
  if(a>=8){
        digitalWrite(6, HIGH);
        delay(ledDelay);
        digitalWrite(6, LOW);
  }
  else if(a<8&&a>6){
    digitalWrite(4, HIGH);
    delay(ledDelay);
    digitalWrite(4, LOW);
  }
  else{
    digitalWrite(2, HIGH);
    delay(ledDelay);
    digitalWrite(2, LOW);
  }
}