#include <Servo.h>

Servo myServo;

const int servoPin = 3;
const int potPin = A0;
const int switchPin = 8;

void setup() {
  myServo.attach(servoPin);
  pinMode(switchPin, INPUT);
}

void loop() {
  int switchState = digitalRead(switchPin);


  if (switchState == HIGH) {
    int potValue = analogRead(potPin);
    int servoAngle = map(potValue, 0, 1023, 0, 180);
    myServo.write(servoAngle);
    delay(15);
  } 
  else {
    myServo.write(0);
  }
}