My First Mesh Project

int photosensor = A0; // This is where your photoresistor or phototransistor is plugged in. The other side goes to the "power" pin (below).
//Analog pins A0-A5 are inputs, so there is no need to explicitly declare this pin as an input in our setup() loop

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

void setup() {
    // This is here to allow for debugging using the USB serial port
    Serial.begin(9600);
    
    //The comment below can be used to create a variable. You can view the value of this variable in the particle console to determine what value is appropriate for the if else statement in the loop.
    
    //Particle.variable("analogvalue", &analogvalue, INT);
    
}

void loop() {
    // check to see what the value of the photoresistor or phototransistor is and store it in the int variable analogvalue
    /*Use the Particle Console to see what the average analogvalue is when your light source is on and off. For me, when the light is on
    the average analogvalue is ~150, and when off analogvalue is ~20 thus making 100 a good threshold choice*/ 
    analogvalue = analogRead(photosensor);
    if (analogvalue>100) {
       Mesh.publish("light on", "main office");
    //If our analogvalue is >100, this means the light is on, and we are going to publish our "light on" message
    }
    else if (analogvalue<=100){
       Mesh.publish("light off", "main office");
    //If our analogvalue is <=100, this means the light is off, and we are going to publish our "light off" message
    }

    // This prints the value to the USB debugging serial port (for optional debugging purposes)
    Serial.printlnf("%d", analogvalue);

    // This delay is just to prevent overflowing the serial buffer, plus we really don't need to read the sensor more than
    // 10 times per second (100 millisecond delay)
    delay(100);
}