first commit

.vscode/settings.json

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+{
+    "files.associations": {
+        "chrono": "cpp"
+    }
+}

GPIOcontrol.h

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+#ifndef GPIO_CONTROL_H
+#define GPIO_CONTROL_H
+
+#include <string>
+#include <fstream>
+#include <iostream>
+#include <unistd.h>
+
+class GPIOControl
+{
+public:
+    GPIOControl(int gpioNum) : gpio(gpioNum) {}
+
+    bool exportGPIO()
+    {
+        return writeToFile("/sys/class/gpio/export", std::to_string(gpio));
+    }
+
+    bool unexportGPIO()
+    {
+        return writeToFile("/sys/class/gpio/unexport", std::to_string(gpio));
+    }
+
+    bool setDirection(const std::string &dir)
+    {
+        return writeToFile("/sys/class/gpio/gpio" + std::to_string(gpio) + "/direction", dir);
+    }
+
+    bool setValue(bool high)
+    {
+        return writeToFile("/sys/class/gpio/gpio" + std::to_string(gpio) + "/value", high ? "1" : "0");
+    }
+
+private:
+    int gpio;
+
+    bool writeToFile(const std::string &path, const std::string &value)
+    {
+        std::ofstream fs(path);
+        if (!fs.is_open())
+        {
+            std::cerr << "无法访问: " << path << std::endl;
+            return false;
+        }
+        fs << value;
+        fs.close();
+        return true;
+    }
+};
+
+#endif // GPIO_CONTROL_H

main.cpp

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+#include "GPIOControl.h"
+#include <thread>
+#include <chrono>
+
+int main()
+{
+    GPIOControl relay(42); // 继电器接在 GPIO42
+
+    if (!relay.exportGPIO())
+        return 1;
+    usleep(100000); // 确保 sysfs 完全准备好
+    if (!relay.setDirection("out"))
+        return 1;
+
+    // 打开继电器
+    relay.setValue(true);
+    std::this_thread::sleep_for(std::chrono::seconds(2));
+
+    // 关闭继电器
+    relay.setValue(false);
+
+    return 0;
+}