void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
   pinMode(12, OUTPUT);
   pinMode(23, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
   int a=digitalRead(23);

  if (a==1)
  {
    Serial.println("light on");
    digitalWrite(12, HIGH);
    delay(1000);
  }
  else
  {
    Serial.println("light off");
    digitalWrite(12, LOW);
    delay(1000);
  }
}1