//Header section
int LED1 = 8 ;
int LED2 = 2 ;

void setup() {
  // put your setup code here, to run once:
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, LOW);
  delay(1000); //1000 millisecond
  
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, HIGH);
  delay(1000);
}