#include <Servo.h>

Servo servoMotor1;  // Create a servo object to control the servo motor

int servoPin = 9;  // Define the pin to which the servo is connected
int potPin = A0;  // Define which port is receiving signal from potentiometer

void setup() {
  servoMotor1.attach(servoPin);  // Attach the servo to the specified pin
}

void loop() {
  int reading = analogRead(potPin); // Read value of potentiometer from analog input pin A0
  int angle = map(reading, 0, 1023, 0, 180); // Convert voltage level readings to an angle
  servoMotor1.write(angle); // Send command to servo
}