int led1 = D2;
void setup() {
pinMode(led1, OUTPUT);
}

void loop() {
for(int i=0; i<5; i++) {
    //loop 5 times 
    
        digitalWrite( led1, HIGH );
        delay( 500 );
       //Delay .5 sec
    
        digitalWrite( led1, LOW );
        delay( 500 );
}


    digitalWrite( led1, LOW);
    delay( 3000);
//stop 3 sec
}