#include <Servo.h>
#define poten A3
Servo myservo;
int potValue ,C ;

void setup() {
  myservo.attach(3); 
}

void loop() {
  potValue = analogRead(poten);                
  C = map(potValue,0,1023,0,180);       
  myservo.write(C);                        
  delay(15);                                     
}