Control a servo with a potentiometer. Configured for a HITECH Deluxe HS-322HD.

servos.ino

#include <Servo.h>

Servo servo;

const int analogPin = 0;

const int servoPin = 9;

// The minimum pulse width corresponding to 0-degrees on the servo.
// Default is 544.
const int servoMin = 600;

// The maximum pulse width corresponding to 180-degrees on the servo.
// Default is 2400.
const int servoMax = 2400;

// Connection layout:
// 5v out to
//   potentiometer red
//   servo red
// ground to
//   potentiometer black
//   servo black
// digital pin #{servoPin} to servo yellow
// potentiometer blue/out to analog pin #{analogPin}

void setup()
{
  servo.attach(servoPin, servoMin, servoMax);
}

void loop()
{
  int value = analogRead(analogPin);

  // This maps potentiometer output in (0...1023) to servo input (0...179).
  value = map(value, 0, 1023, 0, 179);

  servo.write(value);
  delay(15);
}