QT实现一个智能家居系统，包括温湿度、红外遥控、光照等代码实现

智能家居系统需要硬件和软件两部分的实现。硬件包括传感器、执行器、控制器等，而软件则需要实现用户界面、数据处理、通信等功能。下面是一个基于QT实现的智能家居系统的代码实现：

1. 温湿度传感器

//温湿度传感器采集数据
#include <QCoreApplication>
#include <QTimer>
#include <QDebug>
#include <QTime>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QTimer timer;
    QObject::connect(&timer, &QTimer::timeout, [](){
        qsrand(QTime::currentTime().msec());
        float temperature = qrand() % 30; //随机生成0~30摄氏度之间的数
        float humidity = qrand() % 100; //随机生成0~100%之间的数
        qDebug() << "Temperature:" << temperature << "℃" << "Humidity:" << humidity << "%";
    });
    timer.start(5000); //定时器每5秒采集一次数据

    return a.exec();
}

2. 红外遥控

//红外遥控发送命令
#include <QCoreApplication>
#include <QTimer>
#include <QDebug>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QTimer timer;
    QObject::connect(&timer, &QTimer::timeout, [](){
        int command = qrand() % 5; //随机生成0~4之间的数，代表5个不同的命令
        qDebug() << "Send command:" << command;
    });
    timer.start(10000); //定时器每10秒发送一次命令

    return a.exec();
}

3. 光照传感器

//光照传感器采集数据
#include <QCoreApplication>
#include <QTimer>
#include <QDebug>
#include <QTime>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QTimer timer;
    QObject::connect(&timer, &QTimer::timeout, [](){
        qsrand(QTime::currentTime().msec());
        float light = qrand() % 1000; //随机生成0~1000之间的数，代表光照强度
        qDebug() << "Light:" << light << "Lux";
    });
    timer.start(10000); //定时器每10秒采集一次数据

    return a.exec();
}

4. 用户界面

使用QT提供的QML语言编写用户界面，例如：

import QtQuick 2.0
import QtQuick.Controls 2.5
import QtQuick.Layouts 1.3

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: "Smart Home System"

    ColumnLayout {
        anchors.fill: parent
        anchors.margins: 10

        Label {
            text: "Temperature:"
            Layout.alignment: Qt.AlignLeft
        }
        Label {
            text: "20℃"
            Layout.alignment: Qt.AlignRight
        }

        Label {
            text: "Humidity:"
            Layout.alignment: Qt.AlignLeft
        }
        Label {
            text: "50%"
            Layout.alignment: Qt.AlignRight
        }

        Label {
            text: "Light:"
            Layout.alignment: Qt.AlignLeft
        }
        Label {
            text: "500Lux"
            Layout.alignment: Qt.AlignRight
        }

        Button {
            text: "Turn on the light"
            Layout.alignment: Qt.AlignHCenter
        }
    }
}

5. 数据处理和通信

使用QT提供的网络编程和数据存储功能，实现数据处理和通信功能。具体实现代码见下面：

//数据处理和通信
#include <QCoreApplication>
#include <QDebug>
#include <QTcpServer>
#include <QTcpSocket>
#include <QJsonDocument>
#include <QJsonObject>
#include <QFile>

#define PORT 8888

class SmartHomeServer : public QTcpServer
{
public:
    SmartHomeServer(QObject *parent = nullptr)
        : QTcpServer(parent)
    {
        connect(this, &SmartHomeServer::newConnection, this, &SmartHomeServer::onNewConnection);
    }

protected:
    void onNewConnection()
    {
        QTcpSocket *socket = nextPendingConnection();
        qDebug() << "New connection:" << socket->peerAddress().toString();

        connect(socket, &QTcpSocket::readyRead, this, &SmartHomeServer::onReadyRead);
        connect(socket, &QTcpSocket::disconnected, this, &SmartHomeServer::onDisconnected);
    }

    void onReadyRead()
    {
        QTcpSocket *socket = qobject_cast<QTcpSocket*>(sender());
        if(!socket) return;

        QByteArray data = socket->readAll();
        QJsonParseError error;
        QJsonDocument doc = QJsonDocument::fromJson(data, &error);
        if(error.error != QJsonParseError::NoError)
        {
            qDebug() << "Error:" << error.errorString();
            return;
        }

        QJsonObject obj = doc.object();
        QString type = obj.value("type").toString();
        if(type == "temperature")
        {
            float temperature = obj.value("value").toDouble();
            qDebug() << "Temperature:" << temperature;

            //保存到文件
            QFile file("temperature.txt");
            if(file.open(QIODevice::WriteOnly | QIODevice::Append | QIODevice::Text))
            {
                QTextStream stream(&file);
                stream << temperature << "\n";
                file.close();
            }
        }
        else if(type == "humidity")
        {
            float humidity = obj.value("value").toDouble();
            qDebug() << "Humidity:" << humidity;

            //保存到文件
            QFile file("humidity.txt");
            if(file.open(QIODevice::WriteOnly | QIODevice::Append | QIODevice::Text))
            {
                QTextStream stream(&file);
                stream << humidity << "\n";
                file.close();
            }
        }
        else if(type == "light")
        {
            float light = obj.value("value").toDouble();
            qDebug() << "Light:" << light;
        }
        else if(type == "command")
        {
            int command = obj.value("value").toInt();
            qDebug() << "Command:" << command;
        }

        socket->write("Received");
    }

    void onDisconnected()
    {
        QTcpSocket *socket = qobject_cast<QTcpSocket*>(sender());
        if(!socket) return;

        qDebug() << "Disconnected:" << socket->peerAddress().toString();

        socket->deleteLater();
    }
};

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    SmartHomeServer server;
    server.listen(QHostAddress::Any, PORT);

    qDebug() << "Server started:" << server.serverAddress().toString() << ":" << server.serverPort();

    return a.exec();
}

以上就是一个基于QT实现的智能家居系统的代码实现，包括温湿度、红外遥控、光照等功能。当然，这只是一个简单的示例，实际的智能家居系统需要更多的功能和细节的实现。