void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(2, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(2,checkSensor());
}
int checkSensor()
{
  int potValue=analogRead(A0);
  Serial.println(potValue);
  if(potValue>400)
  {
    return 1;
  }
  else
  {
    return 0;
  }
}