#define LED1 5
#define  LED2 10
 
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);
  delay(500);
  digitalWrite(LED2,LOW);
  delay(500);

  digitalWrite(LED2, HIGH);
  delay(500);
  digitalWrite(LED1, LOW);
  delay(500);


}