/*
 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 speed = 600;    //Speed in RPM, 0,1s = 60deg 
int LEDR = 13;
int LEDG = 12;
int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin

void setup() {
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  pinMode(LEDR, OUTPUT);
  pinMode(LEDG, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(LEDR, HIGH);
  int valCheck = val;
  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  val = map(val, 0, 1023, 0, 180);     // scale it to use it with the servo (value between 0 and 180)
  myservo.write(val);                  // sets the servo position according to the scaled value
  delay(3000);                           // waits for the servo to get there

  if (val >= valCheck + 30 || val <= valCheck - 30) //30 degree is how fast u want ur rpm to be like
    {
      digitalWrite(LEDR, LOW);
      digitalWrite(LEDG, HIGH);
      delay(5000);
      digitalWrite(LEDG, LOW);

      }                     

}