// Making an LED Blink

void setup() {
    
    pinMode(D2, OUTPUT);
    pinMode(D3, OUTPUT);
    
    digitalWrite(D2, LOW);
    digitalWrite(D3, HIGH);
    
}

void loop() {

    // // Excercise 1: On & off every 3 secs
    // digitalWrite(D2, HIGH);
    // delay(3000);
    // digitalWrite(D2, LOW);
    // delay(3000);
    
    // // Excercise 2: Blinking & stop
    // for (int i=0; i<5; i++) {
    //     digitalWrite(D2, HIGH);
    //     delay(500);
    //     digitalWrite(D2, LOW);
    //     delay(500);
    // }
    // delay(2500);
    
    // Excercise 3: On & off every 3 secs for 2 LEDs
    digitalWrite(D2, HIGH);
    digitalWrite(D3, LOW);
    delay(3000);
    digitalWrite(D2, LOW);
    digitalWrite(D3, HIGH);
    delay(3000);
}