int photoCellPin = A0;

int photoCellReading = 0;
int ledPin = D2;
int ledBrightness = 0;


void setup()
{

  pinMode(ledPin, OUTPUT);
  Particle.variable("light", &photoCellReading, INT);

}


void loop()
{
  photoCellReading = analogRead(photoCellPin);
  ledBrightness = map(photoCellReading, 0, 4095, 255, 0);
  analogWrite(ledPin, ledBrightness);
  delay(100);
}