int sen = 5;
 int val = 0;
 int LED = 2;
 int I = 0;
 void setup(){
pinMode(LED, OUTPUT);
Serial.begin(9600);
 }

void loop() {
  vol = analogRead(sen);
  serial.println(val);
   
  if (val > 700  val < 300) {
   I = I + 1;  
  }
  if ( I == 1){
  digitalWrite(LED, HIGH);
  Serial.println("LED_on");
  }
  if (I == 2){
   digitalWrite(LED, LOW);
   Serial.println("LED_off");
  }
  deiay(200);



 

}

void loop() {





  

}