diff --git a/LD2453Parser.cpp b/LD2453Parser.cpp
index 378722a..ca5928d 100644
--- a/LD2453Parser.cpp
+++ b/LD2453Parser.cpp
@@ -7,6 +7,7 @@
 // HLK-LD2453 protocol.
 // =====================================================================
 #include "LD2453Parser.h"
+#include <cmath>
 
 #if !defined(ARDUINO_ARCH_ESP32)
 #warning "LD2453Parser was written/tested against the ESP32 Arduino core. Verify HardwareSerial pin-remap behavior on other cores."
diff --git a/LD2453Parser.h b/LD2453Parser.h
index b9f2fe7..9a45e1b 100644
--- a/LD2453Parser.h
+++ b/LD2453Parser.h
@@ -81,6 +81,11 @@ public:
 
     const RadarFrame &getLastFrame() const { return _lastFrame; }
     const LD2453Stats &getStats() const { return _stats; }
+    
+    // Kiểm tra xem có đang nhận dữ liệu từ LD2453 không
+    bool isConnected() const { 
+        return _stats.bytesReceived > 0 && (millis() - _lastByteTime) < 2000;
+    }
 
 private:
     HardwareSerial *_serial = nullptr;