// Define a pin that we will place the photo cell on
// Remember to add a 10K Ohm pull-down resistor
int photoCellPin = A0;

// Create a variable to hold the light reading
int photoCellReading = 0;

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

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

void setup() {
    
// Setup the LED for output
pinMode( ledPin, OUTPUT);

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

}

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