// Ex 1.1

int photoCellPin = A0;
int photoCellReading = 0;
int ledPin = D2;
int ledBrightness = 0;

void setup()
{
  pinMode(ledPin, OUTPUT);

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

}

void loop()
{
  // This gives us a value from 0 to 4095
  photoCellReading = analogRead(photoCellPin);

  // Map this value into the inverted PWM range
  ledBrightness = map(photoCellReading, 0, 4095, 255, 0);

  // fade the LED to the desired brightness
  analogWrite(ledPin, ledBrightness);

  // wait 1/10th of a second and then loop
  delay(100);
}