 
   Serial.println("}");
 
+  // Simple heartbeat
   toggle_led();
-
   delay(1000);
 }
 

}

void loop() {
  Serial.print("{");

  read_voltages(); Serial.print(",");


void setup() {
  Serial.begin(9600);
  Serial.flush();

  pinMode(led_pin, OUTPUT);
  pinMode(ds18_01_pin, OUTPUT);
  pinMode(fan_pin, OUTPUT);

  dht.begin();

  // Turn on the fan
  turn_fan_on();

  // Search for attached DS18B20 sensors
  int x, c = 0;
  for (x = 0; x < num_ds18; x++) {
    if (sensor_bus.search(sensors_address[x]))
    c++;
