const int potPin = A0;  // Potentiometer connected to analog pin A0
const int servoPin = 9; // Servo connected to digital pin 9

void setup() {
  // Set servo pin as output
  pinMode(servoPin, OUTPUT);
}

void loop() {
  // Read the potentiometer value (0 to 1023)
  int potValue = analogRead(potPin);

  // Manually calculate the pulse width (1000 to 2000 microseconds) based on potValue
  int pulseWidth = potValue * (1000.0 / 1023.0) + 1000;

  // Generate the PWM signal manually
  digitalWrite(servoPin, HIGH);
  delayMicroseconds(pulseWidth);
  digitalWrite(servoPin, LOW);

  // Wait for the remainder of the 20ms period (standard for servos)
  delay(20 - pulseWidth / 1000);
}