arduino code

#include <Servo.h>

Servo myservo;  // create servo object to control a servo
                // a maximum of eight servo objects can be created

int pos = 0;    // variable to store the servo position
int val;
void setup()
{
  Serial.begin(9600);
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  myservo.write(0);
  delay(1000);
}
void loop()
{
 delay(100);
}

void serialEvent()
{
  val = Serial.parseInt();
  if(val==1)  // goes from 0 degrees to 180 degrees
  {
    pos=pos+5;
    pos=normal(pos);
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15ms for the servo to reach the position
  }
  else if(val==0)    // goes from 180 degrees to 0 degrees
  {
    pos=pos-5;
    pos=normal(pos);
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15ms for the servo to reach the position
  }

}
int normal(int p)
{
 if(p>175)
 p=180;
 if(p<5)
 p=0;
 return p;
  }