// Potentiometer controls servo position

#include <Servo.h>

Servo servo1;  // create a servo1 servo object
const int   potPin   =  A4;
const int   servoPin =   9;
int         position =   0; // Store a value in position
int         delay1   = 300;
//The Arduino 10-bit ADCs map 0v to 5v between 0 and 1023 inclusive
const float conversionFactor = 180.0/1023.0; // Servo moves between 0 & 180 degrees

void setup() {
  servo1.attach(servoPin); // Attach the servo object to the servo Pin 
}

void loop() {
  // Read the potentiometer pin and adjust the postion of the servo 
  //   in consonance with that reading
  position = analogRead(potPin)*conversionFactor;
  servo1.write(position);
  delay(delay1);             
}