// Práctica encender y apagar un LED
const int LED_j1=2,LED_j2=3,LED_j3=4,LED_j4=5;
void setup()
{
pinMode(LED_j1,OUTPUT);
pinMode(LED_j2,OUTPUT);
pinMode(LED_j3,OUTPUT);
pinMode(LED_j4,OUTPUT);
}
void loop()
{
digitalWrite(LED_j1,HIGH);
digitalWrite(LED_j2,HIGH);
digitalWrite(LED_j3,HIGH);
digitalWrite(LED_j4,HIGH);
delay(1000);
digitalWrite(LED_j1,LOW);
digitalWrite(LED_j2,LOW);
digitalWrite(LED_j3,LOW);
digitalWrite(LED_j4,LOW);
delay(1000);
}