Abstract: According to the increasing demand of smart home system and the wide application of embedded technology, the composition and function of smart home system are analyzed, and the overall structure of smart home controller, which is the core part of smart home control system , is introduced. Technology and Bluetooth communication protocol. A hardware design and software design scheme of a smart home controller based on Samsung's S3C44B0X chip and Bluetooth communication technology is presented. The results show that the system is simple and reliable and easy to expand.
1 Introduction
Smart home is a new type of home that has been produced and rapidly emerged in recent years. The intelligentization of home provides residents with a safer, more comfortable, convenient, fast and open intelligent and informational living space. It has not only become one of the comprehensive indicators of a country's economic strength and science and technology, but also an inevitable trend in the development of human society.
With the rapid development of EDA technology, the realization of smart home has been better solved. This system uses Samsung's S3C44B0X chip, using uC/OS-II real-time operating system and advanced Bluetooth wireless communication technology to give a reasonable, high-performance realization of smart home.
2 overall design
The control system adopts distributed control mode to control all parts of the smart home, including information appliance parts, environmental control (including room temperature, lighting, curtains, etc.), security alarm part, and remote operation part. Each part contains multiple nodes, and each node is a terminal of communication. Each node is independent of each other. When one node fails, it does not affect the operation of other nodes. The overall architecture of the smart home system is shown in Figure 1.
As can be seen from the figure 1, the remote operation part is connected to the main controller by a serial port, and each node in the home forms a Bluetooth network with the main controller to communicate with each other, so that communication with the main controller can be realized through an external computer or network. Realize the control of each node in the home. Of course, it is also possible to directly control the operation of each node by the main controller, which is faster. The main controller sends a control command to the node. After receiving the command, each node performs corresponding analysis and corresponding actions, and then returns to the final state to the main controller. The main controller then sends the information of each node to the remote operation through the serial port. The system can be directly displayed on the display liquid crystal that comes with it. Extended nodes are reserved for each part of the system for future additions.
3 hardware design
3.1 Bluetooth technology
Bluetooth technology is an open specification for wireless data and digital communications, using microwave wireless communication technology to replace data cables to achieve point-to-point or point-to-multipoint short-range communications. The main advantages of Bluetooth technology are: wireless interface can be used instead of wired cable connection anytime and anywhere; it has strong portability and can be used in a variety of communication occasions; low power consumption, low harm to human body; Bluetooth integrated circuit is simple to apply and low in cost Easy to implement and easy to promote. Bluetooth technology uses a globally uniform frequency (ISM band) setting, which is a band that is open to all radio systems, and one of these bands will encounter unpredictable sources of interference. Therefore, Bluetooth technology has specially designed a fast acknowledgment and frequency hopping scheme to ensure link stability.
The Bluetooth protocol stack is shown in Figure 2. The protocols in the Bluetooth architecture can be divided into four layers: core protocols, cable replacement protocols, telephony control protocols, and optional protocols. In addition to these protocol layers, the specification defines the Host Controller Interface (HCI), which provides command interfaces for baseband controllers, link managers, hardware states, and control registers. The Bluetooth core protocols include baseband, LMP, L2CAP, and SDP.
In the Bluetooth protocol stack, the above part of HCI is usually implemented in software, including logical link control and adaptation protocol L2CAP, serial emulation RFCOMM, telephone replacement protocol and optional protocol; while the following parts of HCI are implemented in hardware, including baseband protocol and Link Management Protocol (LMP), also referred to as the underlying hardware module in the Bluetooth protocol architecture.
The use of Bluetooth technology on the home controller is mainly to provide wireless transmission mode for each function module of the home controller. There is not much demand for the high-level protocol of Bluetooth. Therefore, the Bluetooth module can be used to open the home central controller. The Bluetooth protocol is used to develop the Bluetooth function. Considering factors such as cost and structure, information appliances can use Bluetooth module and single-chip microcomputer to realize Bluetooth function. It is obviously impractical to port the entire Bluetooth core protocol stack to the microcontroller. Such a development scheme can be adopted: on the basis of the Bluetooth HCI layer, according to the actual demand of information appliance information transmission, a related protocol is established, and the HCI instruction is directly exchanged with the Bluetooth hardware module by using the single-chip microcomputer to realize information interaction. The information about the home appliance of the MCU is sent out through the Bluetooth module, and the Bluetooth module can also transmit the received command to the MCU with the HCI command.
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