#include <Servo.h>
const byte leftPin = 2;
const byte rightPin = 4;
Servo pointer;
int previousAngle = -1;

void setup() {
  pinMode(leftPin, INPUT_PULLUP);
  pinMode(rightPin, INPUT_PULLUP);
  pointer.attach(9);
  pointer.write(90);
}

void loop() {
  const bool left = digitalRead(leftPin) == LOW;
  const bool right = digitalRead(rightPin) == LOW;
  const int angle = left == right ? 90 : (left ? 60 : 120);
  if (angle != previousAngle) {
    pointer.write(angle);
    previousAngle = angle;
  }
  delay(20);
}