   return crc;
 }
 
-/* Vcc in volt */
+/* Vcc or Battery in volt */
 String returnVccStr() {
   String v = "";
   String Vcc;

    
}

/* received signal strength indicator in dBm */
String returnRssiStr() {
  String rssi = "WiFi: ";
  rssi += WiFi.RSSI();

  return rssi;
}

/* Init PIN */
void initPin() {
  pinMode(HOT_PIN, INPUT);
  pinMode(COLD_PIN, INPUT);
  if (EXT_POWER_CONTROL) {
    pinMode(EXT_POWER_PIN, INPUT_PULLDOWN_16);
  }
