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//Setup variables

int led = D2;

void setup() {
    
    pinMode( led, OUTPUT );
// D2 is the out put pin

}

void loop() {

    digitalWrite( led, HIGH );
    delay( 3000 );
    //delay( 3000 ); - Delay 3 second
    
    digitalWrite( led, LOW );
    delay( 3000 );
    //repeat blinking
    
}
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