#define SERVO_PIN D9 // Define the pin for the servo

void setup() {
  pinMode(SERVO_PIN, OUTPUT); // Set the servo pin as an output
}

void loop() {
  // Sweep from 0 to 180 degrees
  for (int angle = 0; angle <= 180; angle++) {
    int pulseWidth = map(angle, 0, 180, 500, 2400); // Map angle to pulse width (in microseconds)
    digitalWrite(SERVO_PIN, HIGH);
    delayMicroseconds(pulseWidth);
    digitalWrite(SERVO_PIN, LOW);
    delay(20); // Wait for the servo to reach the position
  }

  // Sweep back from 180 to 0 degrees
  for (int angle = 180; angle >= 0; angle--) {
    int pulseWidth = map(angle, 0, 180, 500, 2400); // Map angle to pulse width
    digitalWrite(SERVO_PIN, HIGH);
    delayMicroseconds(pulseWidth);
    digitalWrite(SERVO_PIN, LOW);
    delay(20); // Wait for the servo to reach the position
  }
}