/// setting up a function to switch on and off
int button = 3;
void setup() {
  Serial.begin(9600);

  // put your setup code here, to run once:
pinMode(LED_BUILTIN, OUTPUT);
pinMode(button, INPUT);

}

void loop() {
  

Serial.println(digitalRead(button));
if(digitalRead(button)==HIGH){
  digitalWrite(LED_BUILTIN, HIGH);
}
  else {
    digitalWrite(LED_BUILTIN, LOW);
  }




}