Arduino Code

#include <Servo.h>
#include<String.h>
#include<stdio.h>
#include<stdlib.h>

Servo myServo;


char inData[8]; // Allocate some space for the string
char* inData2;
byte index = 0; // Index into array; where to store the character
int angle = 0;
int newAngle = 0;
int MaxChars = 7;
char ch;
int Size=sizeof(inData);


void SerialEvent();
char* strrev( char* s );





void setup() {
  // put your setup code here, to run once:

  myServo.attach(5);
  Serial.begin(9600);
}



void loop() {
  // put your main code here, to run repeatedly:

  void SerialEvent();

}





void serialEvent()
{
  while (Serial.available())
  {
    char ch = Serial.read();
    Serial.write(ch);
    if (index < MaxChars && isDigit(ch))
    {
      inData[index++] = ch;
    }
    else {
      inData[index] = 0;
      inData2=strrev(inData);
      newAngle = atoi(inData2);
      newAngle=map(newAngle, 0.0, 9999.0, 0.0, 180.0);
      if (newAngle > 0 && newAngle < 180) {
        if (newAngle < angle)
          for (; angle > newAngle; angle -= 1) {
            myServo.write(angle);
          }
        else
          for (; angle < newAngle; angle += 1) {
            myServo.write(angle);
          }
      }
      index = 0;
      angle = newAngle;
      Serial.write(1);
    }
  }
}

char* strrev( char* s )
  {
  char  c;
  char* s0 = s - 1;
  char* s1 = s;

  /* Find the end of the string */
  while (*s1) ++s1;

  /* Reverse it */
  while (s1-- > ++s0)
    {
    c   = *s0;
    *s0 = *s1;
    *s1 =  c;
    }

  return s;
  }