#include <Servo.h>
Servo myservo;  
int dt=1000;
int degree;
  
int potPin = A0;  
int readvalue;   
void setup()   
{  
  myservo.attach(9);  
} 
void loop()   
{  
  readvalue = analogRead(potPin);              
  degree = map(readvalue, 0, 1023, 0, 180);         
  myservo.write(degree);   
  delay(dt);  
                              
}