#include <Servo.h>
Servo arm;
float pos = 0.0;
float step = 1.0;
const int Down = A0;
const int Up = A1;
void setup() {
  // put your setup code here, to run once:
  pinMode(Down, INPUT_PULLUP);
  pinMode(Up, INPUT_PULLUP);
  arm.attach(13);
  arm.write (pos);
}

void loop() {
  if (digitalRead(Down)) {
    if (pos > 0) {
      pos -= step;
      delay(5);
    }// put your main code here, to run repeatedly:

  }
  
  if (digitalRead(Up))
  {
    if (pos < 180) {
      pos += step;
      delay(5);
    }// put your main code here, to run repeatedly:
  }
  
  arm.write(pos);
}