// Our button wired to D4
int buttonPin = D4;

// Define a pin that we'll place the fsr on
int fsrPin = A5;

// Create a variable to hold the pot reading
int forceReading = 0;

// Define a pin we'll place an LED on
int ledPin = D2;

// Create a variable to store the LED brightness.
int ledBrightness = 0;

//
void setup(){

  pinMode( buttonPin , INPUT_PULLUP); // sets pin as input
  
  // Set up the LED for output
  pinMode(ledPin, OUTPUT);

  // Create a cloud variable of type integer
  // called 'light' mapped to photoCellReading
  Spark.variable("force", forceReading );
}

void loop() {

  // find out if the button is pushed
   // or not by reading from it.
   int buttonState = digitalRead( buttonPin );
  
  // Use analogRead to read the FSR reading
  // This gives us a value from 0 to 4095
  forceReading = analogRead(fsrPin);

  // Map this value into the PWM range (0-255)
  // and store as the led brightness
  ledBrightness = map(forceReading, 0, 4095, 0, 255);

  if( buttonState == LOW )
  {
    // fade the LED to the desired brightness
    analogWrite(ledPin, ledBrightness);
    delay(500);
  }else{
    // otherwise
    // turn the LED Off
    digitalWrite( ledPin, LOW);
  }
 
  // wait 1/10th of a second and then loop
  delay(100);
}