#include <Servo.h>
Servo myservo ;
int vr = A0;
int big = 0;
void setup() {
 myservo.attach(9);
Serial.begin(9600);
}

void loop() {
 big = analogRead(vr);
 big = map(big , 0 ,1023 , 0 ,180);
myservo.write(big);
delay(15);
}