void setup() {
  // put your setup code here, to run once:
  pinMode(2, INPUT);
  pinMode(4, OUTPUT);
  Serial.begin(115200);

}

void loop() {
  int state=0;
  int value=analogRead(A3);
  Serial.println(value);
  // put your main code here, to run repeatedly:
  state=digitalRead(2);
  if(state==1)
  {
    digitalWrite(4, HIGH);
    Serial.println("LED ON");
  }
  else
  {
    digitalWrite(4, LOW);
    Serial.println("LED OFF");
  }

}