Untitled

Inside Sketch_file

int led_pin=13;

void setup()
{

pinMode(led_pin,OUTPUT);

digitalWrite(led_pin,HIGH);

delay(1000);

digitalWrite(led_pin,LOW);

}

void loop()

{

}

Output:- Led will blink once...

But modifying code,

int led_pin=13;

void setup() {

pinMode(led_pin,OUTPUT);

}

void loop()

{

digitalWrite(led_pin,HIGH);
delay(500);

digitalWrite(led_pin,LOW);

delay(500);

}