diff --git a/sdk/Arduino/Arduino-ESP32/Helper.cpp b/sdk/Arduino/Arduino-ESP32/Helper.cpp
index 05cc710a..37da8147 100644
--- a/sdk/Arduino/Arduino-ESP32/Helper.cpp
+++ b/sdk/Arduino/Arduino-ESP32/Helper.cpp
@@ -25,7 +25,7 @@ char *wifiPwd = "wifi-password";
 String deviceNum = "D6329VL54419L1Y0";
 String userId = "1";
 String productId = "2";
-String firmwareVersion = "1.0";
+float firmwareVersion = 1.0;
 // 经度和纬度可选，如果产品使用设备定位，则必须传
 float latitude=0;
 float longitude=0;
diff --git a/sdk/Arduino/Arduino-ESP32/Helper.h b/sdk/Arduino/Arduino-ESP32/Helper.h
index df206185..6ee90127 100644
--- a/sdk/Arduino/Arduino-ESP32/Helper.h
+++ b/sdk/Arduino/Arduino-ESP32/Helper.h
@@ -23,7 +23,7 @@ extern String deviceNum ;      // 设备编号（重要，同时是Mqtt的client
 extern String userId;          // 用户ID
 extern String productId;       // 产品ID
 extern float rssi;             // 信号强度（信号极好4格[-55— 0]，信号好3格[-70— -55]，信号一般2格[-85— -70]，信号差1格[-100— -85]）
-extern String firmwareVersion; // 固件版本
+extern float firmwareVersion; // 固件版本
 extern char *wifiSsid;         // WIFI的SSID
 extern char *wifiPwd;          // WIFI的密码
 extern char *mqttHost;         // Mqtt消息服务器地址