#define LED_1 2 // pinD2
#define LED_2 4 //pinD4 
void setup() 
{
  pinMode(LED_1, OUTPUT);
  pinMode(LED_2),OUTPUT;
}

void loop() 
{
 digitalWrite(LED_1, HIGH);
 digitalWrite(LED_2, HIGH);
 delay(1000);
 
 digitalWrite(LED_1, LOW); 
 delay(1000);
 digitalWrite(LED_2, LOW); 
 delay(1000);

 
}