/*
  Bluetooth Retracting Projector Screen - Bluetooth Test
 
This sketch tests the serial connection between a Android app and a Bluetooth chip attached to the Arduino.
Commands are sent from th app via Bluetooth to the Arduino to turn the on board LED on/off.
 
 Created 22 Feb 2012
 modified xx Xxx 20xx
 by Brett Russell
 
 */
 
// Define Constants and Variables
const int ledPin = 13; // names the on board LED pin

int count;		//counting variable for flashing LED
int state;

void setup()
{
  // initialize LED Pin as output
  pinMode(ledPin, OUTPUT);

 
  // initialize serial communications:
  Serial.begin(9600);

  // set LED initial state as off
  digitalWrite(ledPin, LOW);
  
  // write in LED state
  state = digitalRead(ledPin);
}

void loop()
{
  
  // check if serial data is available
  if ( Serial.available() > 0 ) 
  {
  
  	// write the serial command value
  	byte command = Serial.read();	// 1 = Blink Fast, 2 = Blink Slow, 3 = Led off
  	
  	//read the LED state
  	state = digitalRead(ledPin);
  	
  	// if the command sent is 1 and LED is off, blink LED fast
  	if (command == 1 && state == LOW) 
  	{	
  		count = 0; //reset count
  		while (count < 20 && command != 3)
  		{
  			// flashes LED
  			digitalWrite (ledPin, HIGH);
  			delay(250);
  			
  			digitalWrite (ledPin, LOW);
  			delay(250);
  		
  			//incrament count
  			count = ++count;
  			
  			//check command
  			command = Serial.read();
  		}
  			
  	}
  		
  	// if the command sent is 2 and the LED is off
  	else if (command == 2 && state == LOW)
  	{
			
  		count = 0; //reset count
		while (count < 10 && command != 3)
		{
			// flashes LED
		  	digitalWrite (ledPin, HIGH);
		  	delay(500);
		  	
		  	digitalWrite (ledPin, LOW);
		  	delay(500);
		  
		  	//incrament count
		  	count = ++count;
		  	
		  	//check command
  			command = Serial.read();
  		}
  		
  	}
  }
}