With the rapid development of the national economy and the continuous improvement of people's living standards, there has been a growing demand for more comfortable and secure residential environments. At the same time, advancements in computer technology, networking, and information systems have made it possible to implement intelligent remote monitoring solutions for homes. This paper presents an intelligent home remote monitoring system that enables the smart management of household appliances, real-time environmental monitoring, and automatic alarm functions.
The core component of this smart home remote monitoring system is an embedded Web server. The system integrates both wired and wireless communication capabilities. Users can access the home Web server from their office PCs by logging in with a username and password, allowing them to monitor and control various household appliances remotely. A block diagram of the system structure is shown in Figure 1.
In terms of hardware design, the system consists of several key modules, including the ARM9 controller S3C2440, FLASH memory, SDRAM, power supply and reset circuits, a touch screen display, USB camera, Ethernet interface module, GPRS module, and appliance and security control units. A detailed hardware block diagram is presented in Figure 2.
The ARM9 controller S3C2440 is a 16/32-bit RISC processor based on the ARM920T core. It offers high performance, low cost, and low power consumption, making it ideal for embedded applications.
For appliance control, the system provides different solutions depending on the level of intelligence of the devices. For traditional appliances requiring manual control, such as light switches, the system adds auxiliary controllers like relays. Users can then control these devices via Ethernet or SMS. For infrared-controlled devices like TVs and air conditioners, the system uses a universal Ethernet-based controller for remote operation. Smart appliances that support network access can directly connect to the home network for remote control.
Security control involves connecting various sensors (such as smoke, gas, and door sensors) and alarm devices to the controller through GPIO pins. To reduce interference from strong currents, TLP521 optical isolation chips and relays are used to isolate the signals.
The GPRS module, using Siemens' MC35i, allows the system to send pre-stored alarm messages to users’ mobile phones via the GPRS network, ensuring timely response to emergencies.
The Ethernet interface module uses the DM9000 chip to expand the network connectivity. A network isolation transformer, HR601627, is placed between the DM9000 and RJ45 interface to protect the system from voltage surges while enabling signal transmission.
A USB camera, such as the ZC2301P from Vimicro, captures video and sends the data stream to the embedded Web server. Users can log in to the web server to view live video and monitor their homes in real time.
In terms of software design, the system is centered around the ARM9 controller. Its software includes an embedded operating system, device drivers, an embedded Web server, and application software such as web interfaces and CGI programs.
The migration process of the Linux kernel on the S3C2440 involves downloading the Linux kernel source code, decompressing it, configuring the Makefile, and compiling the kernel using a cross-compiler. This ensures the system runs efficiently on the ARM platform.
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