diff --git a/.drone.yml b/.drone.yml
index 23c1d1d..92054d2 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -10,9 +10,11 @@ platform:
 steps:
 - name: upload
   commands:
+  - service ser2net stop
   - cd gateway
   - pio run -e pro-mini
   - echo -n 'reset' > /dev/ttyUSB0; sleep 1s; avrdude -patmega328p -carduino -P/dev/ttyUSB0 -b115200 -D -Uflash:w:.pio/build/pro-mini/firmware.hex:i -v
+  - service ser2net start
   when:
     target:
     - production
diff --git a/gateway/src/gateway.cpp b/gateway/src/gateway.cpp
index 2870728..935ad09 100644
--- a/gateway/src/gateway.cpp
+++ b/gateway/src/gateway.cpp
@@ -1,8 +1,10 @@
 #include <Arduino.h>
 #include <RCSwitch.h>
 #include <Adafruit_Sensor.h>
-#include <ArduinoJson.h>
 #include "Tiny.h"
+
+#define ARDUINOJSON_ENABLE_NAN 1
+#include <ArduinoJson.h>
 #include "Dht.h"
 
 
@@ -43,6 +45,34 @@ void loop() {
 	}
 }
 
+bool buildSensorJson(JsonDocument& jsonDoc, unsigned long value) {
+	jsonDoc["id"] = ID(value);
+
+	JsonObject sensor = jsonDoc.createNestedObject("sensor");
+
+	unsigned long voltage = GET_VCC(value);
+	sensor["voltage"] = voltage == 0 ? NAN : (float)voltage / 1000;
+
+	switch (GET_TYPE(value)) {
+	case SensorType::GENERIC:
+		sensor["value"] = GET_VALUE(value);
+		break;
+	case SensorType::TEMPERATURE:
+		sensor["temperature"] = (float)GET_TEMP(value) / 10;
+		break;
+	case SensorType::HUMIDITY:
+		sensor["humidity"] = (float)GET_HUMIDITY(value) / 10;
+		break;
+	case SensorType::CONTACT:
+		sensor["state"] = GET_STATE(value) ? "on" : "off";
+		break;
+	default:
+		return false;
+	}
+
+	return true;
+}
+
 void readRcSwitch(JsonDocument& jsonDoc) {
 	if (mySwitch.available()) {
 		unsigned long value = mySwitch.getReceivedValue();
@@ -59,32 +89,7 @@ void readRcSwitch(JsonDocument& jsonDoc) {
 				motion["basement"] = value == 1879048230L ? "on" : "off";
 				return;
 			}
-			if (GET_TYPE(value) == SensorType::GENERIC) {
-				JsonObject sensor = jsonDoc.createNestedObject("sensor");
-				sensor["id"] = ID(value);
-				sensor["value"] = GET_VALUE(value);
-				sensor["voltage"] = GET_VCC(value);
-				return;
-			}
-			if (GET_TYPE(value) == SensorType::TEMPERATURE) {
-				JsonObject sensor = jsonDoc.createNestedObject("sensor");
-				sensor["id"] = ID(value);
-				sensor["temperature"] = GET_TEMP(value);
-				sensor["voltage"] = GET_VCC(value);
-				return;
-			}
-			if (GET_TYPE(value) == SensorType::HUMIDITY) {
-				JsonObject sensor = jsonDoc.createNestedObject("sensor");
-				sensor["id"] = ID(value);
-				sensor["humidity"] = GET_HUMIDITY(value);
-				sensor["voltage"] = GET_VCC(value);
-				return;
-			}
-			if (GET_TYPE(value) == SensorType::CONTACT) {
-				JsonObject sensor = jsonDoc.createNestedObject("contact");
-				sensor["id"] = ID(value);
-				sensor["state"] = GET_STATE(value) ? "on" : "off";
-				sensor["voltage"] = GET_VCC(value);
+			if (buildSensorJson(jsonDoc, value)) {
 				return;
 			}
 		}
@@ -105,7 +110,7 @@ void runJsonCommand(String cmd) {
 	DeserializationError err = deserializeJson(jsonArray, cmd);
 	if (err == DeserializationError::Ok) {
 		JsonArray array = jsonArray.as<JsonArray>();
-		for(JsonVariant jsonDoc : array) {
+		for (JsonVariant jsonDoc : array) {
 			if (jsonDoc.containsKey("rcSwitch")) {
 				JsonObject rcSwitch = jsonDoc["rcSwitch"];
 				unsigned int protocol = rcSwitch["protocol"];
diff --git a/libraries/Tiny/Tiny.h b/libraries/Tiny/Tiny.h
index 67dc4c4..bf3ed9d 100644
--- a/libraries/Tiny/Tiny.h
+++ b/libraries/Tiny/Tiny.h
@@ -13,7 +13,7 @@
 #define GET_TEMP(value) (((unsigned long)value >> 18) & 0x2FF)
 #define GET_HUMIDITY(value) (((unsigned long)value >> 18) & 0x2FF)
 #define GET_VALUE(value) (((unsigned long)value >> 18) & 0x2FF)
-#define GET_VCC(value) ((value >> 5) & 0x1FFF)
+#define GET_VCC(value) (((unsigned long)value >> 5) & 0x1FFF)
 
 enum SensorType {
 	GENERIC = 4,