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int led1 = D2;

void setup() {
    pinMode(led1, OUTPUT);
}

void loop() {
    for(int i = 0; i < 5; i++) {
        digitalWrite(led1, HIGH);
        delay(500);
        
        digitalWrite(led1, LOW);
        delay(500);
    }
     
    digitalWrite(led1, LOW);
    delay(3000);
}
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