/* Sweep
  by BARRAGAN <http://barraganstudio.com>
  This example code is in the public domain.

  modified 28 May 2015
  by Michael C. Miller
  modified 8 Nov 2013
  by Scott Fitzgerald

  // use Vin and GND
  use pins D7, GND and 5V

  http://arduino.cc/en/Tutorial/Sweep
*/

#include <Servo.h>

Servo myservo;  // create servo object to control a servo


void setup() {
  Serial.begin(115200);
  // d7 on the wemos D1
  // attaches the servo on GIO2 to the servo object
  myservo.attach(13);
}

void loop() {
  int pos;
  int startPosition = -10;
  int endPosition = 80;
  int millisecondStep = 10;

  for (pos = startPosition; pos <= endPosition; pos += 1) { // goes from 0 degrees to 180 degrees
    // in steps of 1 degree
    Serial.print(pos);
    Serial.print("\n");
    myservo.write(pos);
    delay(millisecondStep);
  }
  for (pos = endPosition; pos >= -startPosition; pos -= 1) {
    myservo.write(pos);
    delay(millisecondStep);
  }
}