// C++ code
//
#include <Servo.h>

int p = 0;

Servo servo_2;

void setup()
{
  Serial.begin(9600);

  servo_2.attach(2, 500, 2500);
  pinMode(3, INPUT);
  pinMode(4, INPUT);

  p = 0;
  servo_2.write(p);
}

void loop()
{
 
  Serial.print(digitalRead(4));
  Serial.print("\t");
  Serial.print(digitalRead(3));
  Serial.print("\t");
  Serial.println(p);

  if (digitalRead(3)== HIGH && p < 180) 
  {
    p = p + 20;
    
    servo_2.write(p);
  }
  else if (p == 180) 
  {
    p = 0;
    servo_2.write(p);
  }

  if (digitalRead(4) == HIGH && p > 0) 
  {
    p = p - 20;
    servo_2.write(p);
  }
  else if (p == 0) 
  {
    p = 0;
    servo_2.write(p);
  }
  delay(100); 
}