int ledPin = D1;

// Our button wired to D0
int buttonPin = D3;

int photoCellPin = A0;
int photoCellReading = 0;
int ledBrightness = 0;

void setup()
{

  // For input, we define the
  // pushbutton as an input-pullup
  // this uses an internal pullup resistor
  // to manage consistent reads from the device

  pinMode( buttonPin , INPUT_PULLUP); // sets pin as input

  // We also want to use the LED

  pinMode( ledPin , OUTPUT ); // sets pin as output

  // Create a cloud variable of type integer
  // called 'light' mapped to photoCellReading
  Particle.variable("light", &photoCellReading, INT);
  
}

void loop()
{
   // find out if the button is pushed
   // or not by reading from it.
   int buttonState = digitalRead( buttonPin );
   Serial.println(buttonState);

  // remember that we have wired the pushbutton to
  // ground and are using a pulldown resistor
  // that means, when the button is pushed,
  // we will get a LOW signal
  // when the button is not pushed we'll get a HIGH

  // let's use that to set our LED on or off

  if( buttonState == LOW )
  {
    // turn the LED On
    digitalWrite( ledPin, HIGH);
    
    // Use analogRead to read the photo cell reading
    // This gives us a value from 0 to 4095
    photoCellReading = analogRead(photoCellPin);
    
    // Map this value into the PWM range (0-255)
    // and store as the led brightness
    ledBrightness = map(photoCellReading, 2000, 4095, 0, 255);
    
    // fade the LED to the desired brightness
    analogWrite(ledPin, 255 - ledBrightness);
    
    // wait 1/10th of a second and then loop
    delay(100);
    

  }else{
    // otherwise
    // turn the LED Off
    digitalWrite( ledPin, LOW);

  }


}