#include <Servo.h>

int SRV = 9;

Servo myservo;

void setup(){
  Serial.begin(9600);
  pinMode(SRV, OUTPUT);
}

void loop(){
  while(Serial.available()){
    byte inChar = (byte)Serial.read();
    if((inChar % 2) == 1){ 
    myservo.attach(9);
    myservo.write(0);
    delay(500);
    myservo.write(180);
    delay(500);
}
  }
}