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int led1 = D3;

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

}


// EX 2
void loop() {
    
    for (int i = 0; i < 5; i++) {
        digitalWrite(led1, HIGH);
        delay(500);
        digitalWrite(led1, LOW);
        delay(500);
    }
    
    delay(3000);

}
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