s.ino

#include "Arduino.h"
#include <Servo.h>

Servo servo;
char line[10];
int line_index;

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

    Serial.println("started");

    servo.attach(9);
    line_index = 0;
    memset(line, 0, sizeof(line));
}

void loop() {
    // check for input from the user
    if ( Serial.available() ) {
        line_index = 0;
        memset(line, 0, sizeof(line));

        int ret = Serial.readBytes( line, sizeof(line) );
        Serial.print("bytes: 0x"); Serial.println(ret, HEX);

        Serial.print("read: 0x");
        for (line_index=0; line_index<ret; line_index++){
            Serial.print(line[line_index]);
        }
        Serial.println("");

        int out;
        ret = sscanf(line, "%d", &out);
        Serial.print("out: "); Serial.println(out);

        servo.write(out);
    }
}