int ledPin=13;//you can connect this to any pin (here 13)
void setup() {
pinMode(ledPin,OUTPUT);//this represents the mode like if it is temperature then it is input cuz it get the temp degree
}

void loop(){//analog used for continus transmission and digital is opposite {
  digitalWrite(ledPin,HIGH);//high means turn on
  delay(500);//millisecond
  digitalWrite(ledPin, LOW);//low means turn off
  delay(500);

}