quadcopter_notifier.ino

const int ldr = A0;

int lightlevel = 0;
String charged = "init";    
int threshold = 750;

void setup() {
    pinMode(ldr, INPUT);
    
    delay(5000);
}

void loop() {
    lightlevel = analogRead(ldr);
    
    if(lightlevel < threshold && charged != "true") {
        Spark.publish("status", "charged (" + String(lightlevel) + ")");
        charged = "true";
    } 
    else if(lightlevel > threshold && charged != "false") {
        Spark.publish("status", "charging (" + String(lightlevel) + ")");
        charged = "false";
    }
    
    delay(1000);
}