/*
 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 potpin = 0;  // analog pin used to connect the potentiometer
int pinLed1 = 2;
int pinLed2 = 3;
int pinLed3 = 4;
int pinLed4 = 5;
int val;    // variable to read the value from the analog pin

void setup() {
  Serial.begin(9600);
  pinMode(pinLed1, OUTPUT);
  pinMode(pinLed2, OUTPUT);
  pinMode(pinLed3, OUTPUT);
  pinMode(pinLed4, OUTPUT);
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
}

void loop() {
  int nilaiPot = analogRead(potpin);
  if (nilaiPot > 200) {
    digitalWrite(pinLed1, HIGH);
  } else {
    digitalWrite(pinLed1, LOW); 
  } if (nilaiPot > 400) {
    digitalWrite(pinLed2, HIGH);
  } else {
    digitalWrite(pinLed2, LOW);
  } if (nilaiPot > 600) {
    digitalWrite(pinLed3, HIGH);
  } else {
    digitalWrite(pinLed3, LOW);
  } if (nilaiPot > 800) {
    digitalWrite(pinLed4, HIGH);
  } else {
    digitalWrite(pinLed4, LOW);
  }
  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
  Serial.println(analogRead(0));
  delay(15);                           // waits for the servo to get there
}