// Exercise 1_3

int led1 = D2;
int led2 = D3;

void setup() {
    pinMode( led1, OUTPUT );
    pinMode( led2, OUTPUT );
}

void loop() {
    
    digitalWrite(led2, HIGH);
    
    for(int i = 0; i< 5; i++){
        digitalWrite(led1, HIGH);
        digitalWrite(led2, LOW);
        delay(500);
        
        digitalWrite(led1, LOW);
        digitalWrite(led2, HIGH);
        delay(500);
    }
    
    delay(3000);
}