Light Detecting Email Sender

int led = D7; // This is where your can use can plug in a different LED. The other side should go to a resistor connected to GND.

int photoresistor = A0; // This is where your photoresistor is plugged in. The other side goes to the "power" pin (refer to diagram).

int power = A5; // This is the other end of your photoresistor. The other side is plugged into the "photoresistor" pin (above).
// The reason we have plugged one side into an analog pin instead of to "power" is because we want a very steady voltage to be sent to the photoresistor.
// That way, when we read the value from the other side of the photoresistor, we can accurately calculate a voltage drop.

int analogvalue; // Here we are declaring the integer variable analogvalue, which we will use later to store the value of the photoresistor.

void setup() {

    // First, declare all of our pins. This lets our device know which ones will be used for outputting voltage, and which ones will read incoming voltage.
    pinMode(led,OUTPUT); // Our LED pin is output (lighting up the LED)
    pinMode(photoresistor,INPUT);  // Our photoresistor pin is input (reading the photoresistor)
    pinMode(power,OUTPUT); // The pin powering the photoresistor is output (sending out consistent power)

    // Next, write one pin of the photoresistor to be the maximum possible, so that we can use this for power.
    digitalWrite(power,HIGH);

    // We are going to declare a Particle.variable() here so that we can access the value of the photoresistor from the cloud.
    Particle.variable("analogvalue", &analogvalue, INT);
    // This is saying that when we ask the cloud for "analogvalue", this will reference the variable analogvalue in this app, which is an integer variable.

}

void loop() {

    // check to see what the value of the photoresistor is and store it in the int variable analogvalue
    analogvalue = analogRead(photoresistor);
    delay(100);
    
    if(analogvalue>=250){
        digitalWrite(led, HIGH);
        Spark.publish("Light_limit","Exceeded",60,PRIVATE);
        delay(5000); //delay for LED
        digitalWrite(led, LOW);
        delay(10000); //10 second gap for each observation
        // Add a delay to prevent getting tons of emails from IFTTT
    }
}