// 2011 mlab.taik.fi/paja
// Controlling servo motor from N9 QML application over Bluetooth

// import Servo library. This library comes with Arduino software by default.
// To install a library, unzip the library and copy it to following location.
// Arduino.app > Contents > Resources > Java > hardware > libraries. 
// Restart the Arduino. Yoshould see the library in the Import Library menu. 
#include <Servo.h>

// You can access all Servo related features through this library.
// Each statement always have to end with ";" (semicolon) symbol. Otherwise compiler will return a error.


// declare Servo object into a memory space.
Servo myServo;
// declare integer variable which you can store numbers between -32,768 and 32,767 
int incomingByte = 0;



// setup() and loop() are mandatory functions. Setup() only runs once after pressing a reset 
// button or power is supplied. loop() is excuted consecutively after setup ran.
// As both functions don't return any value, datatype is set as void.

// The setup function will only run once, after each powerup or reset of the Arduino board.
void setup()
// functions always have to start with a curly brace and end with a closing curly brace.
{ 
  // Initiate serial communication between Arduiono and PC
  // Parameter is for baud rate (speed of transmiting data) 9600 is used often as default .
  Serial.begin(9600);
  // Servo motor works only PWM (Pulse-width modulation) pins on Arduiono
  // Assign a pin which is connected to the servo
  myServo.attach(9);
}

 // as the name suggests, the loop function runs consecutively. 
void loop(){
  // Check if the Serial port received new data
  if (Serial.available() > 0) {
    // read the incoming byte:
    incomingByte = Serial.read();
    
    // send value between 0 and 180 to the servo motor
    if (incomingByte > 4) {
      myServo.write(incomingByte);
    }
    // pause this program for a certain milisecond
    //delay(100);
  }
}