int led=2;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(led, OUTPUT);
}
void loop() {
  // put your main code here, to run repeatedly:
int val = analogRead(A0);
if(val<250) {
  digitalWrite(led,1);
}
else {
  digitalWrite(led,0);
}
}