// Moch Rijki Supriyatna ("MRS") ("IKY")

#include <servo.h>

servo arm;
float pos = 0.0;
const int step = 1;

void setup() {
  pinMode (A1, INPUT_PULLUP);
  pinMode (A2, INPUT_PULLUP);
  arm.attach(3);
  arm.write(pos);
}

void loop() {
  if (!digitalRead(A1) && pos > 0) {
    arm.write(pos -= step);
    delay(5);
  }
  if (!digitalRead(A2) && pos < 180) {
    arm.write(pos += step);
    delay(5);
  }
}