/*
  Bluetooth Retracting Projector Screen Pot Sensor Test
 
This sketch uses a potentiometer to turn a LED on and off.
The LED is off in the upper and lower 5% of the range of the pot.
It prints the current pot value to serial for calibration.
 
 Created 20 Feb 2012
 modified xx Xxx 20xx
 by Brett Russell
 
 */
 
// Define Constants
const int analogPin = A0;	// pin that the pot is attached to
const int thresholdUp = 972;   	// the analog input threshold level that determines when the screen is up
const int thresholdDown = 51;	// the analog input threshold level that determines when the screen is down
const int ledPin = 13;		// sets LED pin

void setup()
{
  // initialize serial communications
  Serial.begin(9600);
  
  // sets LED pin as output
  pinMode(ledPin,OUTPUT);
  digitalWrite(ledPin, LOW);
}

void loop()
{
  // read the value of the potentiometer
  int potPosition = analogRead(analogPin);
  
  // check if pot is in on range
  if (potPosition > thresholdDown && potPosition < thresholdUp)
  {
  	do
  	{
  		// turn LED on
  		digitalWrite(ledPin, HIGH);
  		
  		// read pot position
  		potPosition = analogRead(analogPin);
  		
  		//print pot position to serial
  		Serial.println(potPosition);
  		
  	} // recheck pot position 
  	  while(potPosition > thresholdDown && potPosition < thresholdUp);
  }
  //Shuts off LED if pot leaves on range
  digitalWrite( ledPin, LOW);
}