#include <Servo.h>
Servo myServo;  

int angle = 90;
int upButton = 2;
int downButton = 3;

void setup() {
  myServo.attach(9);
  pinMode(upButton, INPUT);
  pinMode(downButton, INPUT);
  myServo.write(angle);
}

void loop() {
  if (digitalRead(upButton) == HIGH) {
    angle = min(angle + 10, 180);
    myServo.write(angle);
    delay(200);
  }

  if (digitalRead(downButton) == HIGH) {
    angle = max(angle - 10, 0);
    myServo.write(angle);
    delay(200);
  }
}