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Code

void setup() {
  int LED_BUILTIN = 13; 
  // LED 핀 설정
  pinMode(LED_BUILTIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // LED 활성화
  delay(1000);                       // 1초 기달리기
  digitalWrite(LED_BUILTIN, LOW);    // LED 비활성화
  delay(1000);                       // 1초 기달리기
}