// Define the FSR Pin and create a variable to hold the FSR reading.
int fsrPin = A0;
int fsrReading = 0;

// Define the pin for the LED associated with the FSR and the LED 
// associated with the proximity sensor.
int ledPin = D0;
int greenPin = A4;

// Define a variable to store the readings from the proximity sensor.
int x;

// Define the speaker pin.
int soundPin = D1;

// Time for setup.  Set the LED and speaker pins to output.
// Set the proximity sensor pin (A1) to input.
void setup()
{
  pinMode(ledPin, OUTPUT);
  Spark.variable("force", &fsrReading, INT);
  Spark.variable("x", &x, INT);
  pinMode(A1, INPUT);
  pinMode(soundPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
}

// Time to create the loop.
void loop()
{

// Read the FSR and proximity sensors.
  fsrReading = analogRead(fsrPin);
  delay(100);
  x = analogRead(A1);

// Next is a series of if statements to control the LEDs and speaker.
// I used if statements because I wanted all of the LEDs and 
// the speaker to either be on or off.

// If someone is within range of the proximity sensor, turn off the
// vacancy light and off the speaker.
  if (x>900)
  {
    analogWrite(greenPin, 0);
    analogWrite(soundPin, 0);
  }

// If no one is within range of the proximity sensor, turn on the
// vacancy light.
  if (x<900)
  {
    analogWrite(greenPin,255);
  }

// If the seat is not pressing on the FSR, and no one is within 
// range of the proximity sensor, turn the speaker on.
  if (fsrReading<2000 && x<900)
  {
    analogWrite(soundPin,100);
  }

// If the seat is pressing on the FSR, turn the speaker off and
// the seat is down light on.
  if (fsrReading>2000)
  {
    analogWrite(soundPin, 0);
    analogWrite(ledPin, 255);
  }

// If the seat is not pressing on the FSR, turn the seat is down
// light off.
  if (fsrReading<2000)
  {
    analogWrite(ledPin, 0);
  }

}