int val =0;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(13, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
val=analogRead(0);
Serial.println(val);
delay(100);
if (val<400){
  digitalWrite(13, LOW);
  delay(1000);
  }
else{
 digitalWrite(13,HIGH);
 delay(1000);
 }
}