#define LEDPIN 2  //D3TT  Telkom University
void setup() {
  // put the setup code here, to run once:
  pinMode(LEDPIN, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(LEDPIN, HIGH);
  delay(500);
  digitalWrite(LEDPIN, LOW);
  delay(500);
}