/*
  Controlling a servo position using a potentiometer (variable resistor)
  by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>

  modified on 8 Nov 2013
  by Scott Fitzgerald
  http://www.arduino.cc/en/Tutorial/Knob
*/

#include <Servo.h>

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

int period = 7000;
unsigned long time_now = 0;

int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin
int pos;
void setup() {
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
}

void loop() {
  if (millis() - time_now > period) {
    time_now = millis();
    for (int i = 0; i < 3; i++) { // sets the servo position according to the scaled value
      for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
        // in steps of 1 degree
        myservo.write(pos);              // tell servo to go to position in variable 'pos'
        delay(15);                       // waits 15ms for the servo to reach the position
      }
      for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
        myservo.write(pos);              // tell servo to go to position in variable 'pos'
        delay(15);                       // waits 15ms for the servo to reach the position
      }
    }
  }
}