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Servo myservo;

void setup() {
  myservo.attach(D0);
  myservo.write(0);
}

void loop() {
  for (int i=0; i<180; i++) {
	myservo.write(i);
	delay(100);
  }
  for (int i=180; i>=0; i—) {
	myservo.write(i);
	delay(100);
  }
}