diff --git a/src/main.cpp b/src/main.cpp
index 8355502..96a1b90 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3,13 +3,24 @@
 #include "toml.hpp"
 #include <chrono>
 #include <thread>
+#include <csignal>
+#include <atomic>
 #include "SerialPort.h"
 #include "LedCommand.h"
 #include "LedMqttSubscriber.h"
 
 using namespace toml;
 
+// 声明全局变量
 int led_num = 0;
+std::atomic<bool> running(true);
+
+// 信号处理器
+void signalHandler(int signum)
+{
+    std::cout << "\n收到中断信号 (" << signum << ")，准备退出..." << std::endl;
+    running = false;
+}
 
 class BreathingLight
 {
@@ -74,11 +85,28 @@ void alwaysRed(SerialPort &serial)
 void alwaysGreen(SerialPort &serial)
 {
     LedCommand cmd;
-    cmd.setColor(0, 255, 0); // 红色
+    cmd.setColor(0, 255, 0);
     cmd.setExtCount(led_num);
     auto packet = cmd.serialize();
 
-    std::cout << "发送常红数据包：";
+    std::cout << "发送常绿数据包：";
+    for (auto b : packet)
+        printf(" %02X", b);
+    std::cout << std::endl;
+
+    if (!serial.writeData(packet.data(), packet.size()))
+        std::cerr << "发送数据失败" << std::endl;
+}
+
+// 关灯
+void CloseLed(SerialPort &serial)
+{
+    LedCommand cmd;
+    cmd.setColor(0, 0, 0);
+    cmd.setExtCount(led_num);
+    auto packet = cmd.serialize();
+
+    std::cout << "发送关闭数据包：";
     for (auto b : packet)
         printf(" %02X", b);
     std::cout << std::endl;
@@ -89,6 +117,10 @@ void alwaysGreen(SerialPort &serial)
 
 int main()
 {
+    // 注册信号处理函数
+    std::signal(SIGINT, signalHandler);
+    std::signal(SIGTERM, signalHandler);
+
     std::string port = "/dev/ttyS0";
     int baudrate = 115200;
 
@@ -136,7 +168,7 @@ int main()
 
     BreathingLight breathingLight;
 
-    while (true)
+    while (running)
     {
         mqtt.checkTimeout(std::chrono::seconds(3)); // 没消息则重置数据
 
@@ -164,8 +196,9 @@ int main()
         std::this_thread::sleep_for(std::chrono::milliseconds(100));
     }
 
+    CloseLed();
     serial.closePort();
     mqtt.disconnect();
-
+    std::cout << "程序已退出。" << std::endl;
     return 0;
 }