Move Particle variable registration to setup function

Previously these were being registered in the main loop
but that is not the correct way to expose them to the Particle
cloud. This change refactors the variables we want to be accessible
through the cloud API to be globals and registers them in the `setup`
function.

temperature.ino

@@ -17,24 +17,32 @@ const int LED_PIN = D7;
 
 const int DALLAS_RESOLUTION = 12;
 
+// This determines how much space we allocate ahead of time
+// for storing temperature readings.
+const int MAX_NUMBER_OF_SENSORS = 8;
+
 // Wait 60 sec between loop itterations.
 const int LOOP_DELAY = 60000;
 
 DallasTemperature dallas(new OneWire(TEMPERATURE_SENSOR_PIN));
 
 // The number of temperature sensors detected on the one-wire pin.
-int numberOfDevices;
+int numberOfDevices = 0;
+
+// Allocates the array where we store current temperature readings.
+double temperatures[MAX_NUMBER_OF_SENSORS] = { 0.0 };
 
 void setup(){
   pinMode(LED_PIN, OUTPUT);
 
-  numberOfDevices = 0;
-
   dallas.begin();
 
   dallas.setResolution(DALLAS_RESOLUTION);
 
+  // Get the actual number of connected devices.
   numberOfDevices = dallas.getDeviceCount();
+
+  setupParticleVariables(&numberOfDevices, temperatures);
 }
 
 void loop(){
@@ -43,21 +51,15 @@ void loop(){
 
   dallas.requestTemperatures();
 
-  double temperatures[numberOfDevices] = { 0.0 };
-
   String values = String("{");
 
   // Loop through each device and build a payload of the data.
   for (int i = 0; i < numberOfDevices; i++) {
     // Search the wire for address
     DeviceAddress thermometerAddress;
     if (dallas.getAddress(thermometerAddress, i)){
-      int resolution = dallas.getResolution(thermometerAddress);
       int sensorNumber = i + 1;
 
-      String resolutionVar = "resolution" + String(sensorNumber);
-      Particle.variable(resolutionVar, &resolution, INT);
-
       // Output the device ID
       Serial.print("Temperature for device: ");
       Serial.println(i, DEC);
@@ -75,9 +77,6 @@ void loop(){
           )
         );
 
-        String temperatureVar = "temperature" + String(sensorNumber);
-        Particle.variable(temperatureVar, &temperatures[i], DOUBLE);
-
         Serial.print("Temp C: ");
         Serial.print(tempTemperature);
         Serial.print(" Temp F: ");
@@ -90,8 +89,6 @@ void loop(){
     String::format("\"devices:\": %d }", numberOfDevices)
   );
 
-  Particle.variable("devices", &numberOfDevices, INT);
-
   String data = String::format(
     "{ \"tags\" : {\"id\": \"%s\", \"location\": \"%s\", \"firmware\": \"%s\"}, \"values\": %s }",
     "t2",
@@ -107,3 +104,14 @@ void loop(){
 
   delay(LOOP_DELAY);
 }
+
+void setupParticleVariables(int *numberOfDevices, double *temperatures) {
+  Particle.variable("devices", numberOfDevices, INT);
+
+  for (int i = 0; i < *numberOfDevices; i++) {
+    int sensorNumber = i + 1;
+
+    String temperatureVar = "temperature" + String(sensorNumber);
+    Particle.variable(temperatureVar, &temperatures[i], DOUBLE);
+  }
+}

version.h

@@ -1 +1 @@
-#define FIRMWARE_VERSION "0.0.1"
+#define FIRMWARE_VERSION "0.0.2"