#include <Servo.h>
const int upBtn = 3;
const int dnBtn = 2;
const int srvoPin = 6;

int pos = 90;

Servo MonServo;

void setup()
{
  pinMode(dnBtn, INPUT_PULLUP);
  pinMode(upBtn, INPUT_PULLUP);
  Serial.begin(9600);
  MonServo.write(pos);
  MonServo.attach(srvoPin);
}

void loop ()
{
  if (digitalRead(upBtn) == LOW) {
    MonServo.write(pos);
    pos += 1;
    if (pos > 180) {
      pos = 180;
    }
    Serial.println(pos);
  }
  if (digitalRead(dnBtn) == LOW) {
    MonServo.write(pos);
    pos -= 1;
    if (pos < 0) {
      pos = 0;
    }
    Serial.println(pos);
  }
  delay(100);
}