CN104865835A - Intelligent household system based on ZigBee - Google Patents

Abstract

The invention discloses a smart home system based on ZigBee, which includes a home equipment node, a home master node, a home gateway and an intelligent mobile client. ZigBee modules are arranged in the home environment as home equipment nodes to form a network in a wireless communication manner. The device node is responsible for monitoring the environmental status within a certain range, sending and receiving signals and performing data processing. The ZigBee wireless sensor network is used as the home control subnet, and the home PC is used as the home gateway and home control center. On the Android platform, the wireless data is transmitted through WIFI. Communication technology is connected to the home subnet to realize intelligent control and remote monitoring of home system equipment. The invention is simple and efficient, low in cost, strong in versatility and good in expandability.

Description

A Smart Home System Based on ZigBee

technical field

The invention relates to a smart home system, in particular to a ZigBee-based smart home system.

Background technique

With the development of modern science and technology, the concepts of automation and intelligence have been deeply rooted in the hearts of the people, and various smart home products have also begun to enter our lives. At present, there is a lack of strict standards and common interfaces between various smart home systems and products, and due to current technical conditions and economic cost constraints, the specific application of smart home has not been widely popularized. How to design and implement a set of simple and efficient, The smart home system with low cost, strong versatility and good scalability has certain social and economic value for the promotion and use of smart home in practical applications.

Aiming at the characteristics and deficiencies of the existing smart home control system, this work proposes to use the ZigBee wireless sensor network as the home control subnet, and use the home PC as the home gateway and home control center, and connect it through WIFI wireless data communication technology on the Android platform. Enter the home subnet to realize intelligent control and remote monitoring of home system equipment.

First of all, the ZigBee protocol standard and related concepts are deeply analyzed, and the network topology, network configuration, network association, endpoint binding and data transmission mechanism are designed and realized by using the 2530ZigBee development module of Shenzhen Alliant Electronics Company. It can complete the intelligent control of lighting, curtains, range hood, temperature and humidity, gas alarm and other functions.

Secondly, based on the architecture of the Microsoft MFC framework, the design method of the PC application program based on the MFC framework and the mobile device application program based on the Android platform are discussed, as well as the realization of WindowsSocket network communication under the MFC framework. The access means of WIFI network is studied, and the programming of home gateway program and the development of Android smart phone client are realized. The home gateway interface is simple, easy to operate, and reliable in control. The smart phone client can realize the viewing of family environment information and the control of home appliances.

Again, this system adopts Samsung's ARM9S3C2440 minimum system board, based on the embedded Linux operating system, builds a BOA server on the development board, uses the camera to collect real-time video data, realizes remote wireless mobile video monitoring, and uses The client interface or browser accesses the development board through the wireless network to realize the real-time monitoring function of the client.

Finally, the system uses NXP's MFRC522 non-contact card swiping module and stepper motor to realize the intelligent access control function. And the GSM module SIM900A is used to realize the SMS reminder when non-family members enter the room.

The smart home system based on ZigBee technology is a powerful system with superior performance. This system can overcome some common problems in existing smart home systems, but for the overall realization and application of smart home systems and the popularization of smart homes, there are still many places to be improved and expanded. For example: the home control subnet protocol only involves relatively simple analog and switch signals, and lacks corresponding support for relatively complex devices such as digital TV set-top boxes.

Contents of the invention

The purpose of the present invention is to provide a ZigBee-based smart home system to solve the problems raised in the above-mentioned background technology.

To achieve the above object, the present invention provides the following technical solutions:

A ZigBee-based smart home system includes a home device node, a home master node, a home gateway and an intelligent mobile client, and the home device node and the home gateway are wirelessly connected through the home master node.

As a further solution of the present invention: the home appliance node includes a radio frequency transceiver module, an operation and control unit, a sensing and execution module, the hardware core of the home appliance node is a ZigBee wireless transceiver module based on CC2530, and the home appliance node The underlying terminals of the system mainly include three-meter metering nodes, ambient temperature and humidity monitoring and control nodes, alarm signal collection nodes, home appliance control nodes, and lighting control nodes.

As a further solution of the present invention: the home appliance node adopts a ZigBee simplified device, and the home master node adopts an all-around device.

As a further solution of the present invention: the home master node includes at least one FFD device of the ZigBee network.

As a further solution of the present invention: the working process of the home master node includes: (1) system initialization; (2) network topology update; (3) node communication.

As a further solution of the present invention: arranging ZigBee modules in the home environment is organized into a network as home equipment nodes in a wireless communication mode, and the home equipment nodes are responsible for monitoring the environmental status within a certain range around, sending and receiving signals and performing data processing. The sensor network is used as the home control subnet, and the home PC is used as the home gateway and home control center. On the Android platform, it is connected to the home subnet through WIFI wireless data communication technology to realize intelligent control and remote monitoring of home system equipment.

Compared with the prior art, the beneficial effects of the present invention are: simple and efficient, low cost, strong versatility and good expansibility.

Features and Innovation

(1) Based on ZigBee technology, the home appliance control, home environment monitoring, security and other functions of the smart home system are realized, and remote monitoring is realized.

(2) When the system is actually applied, someone at home can use the indoor terminal mode, which is controlled by the home gateway or smart terminal; when leaving home, it can use the going out mode, and at this time, the smart terminal can be used for monitoring and control.

(3) By modifying the source code of the video server MJPG, multi-platform transplantation can be realized, which can be transplanted to LINUX\UNIX\WINDOWS at the same time; the video acquisition access device can be compatible with USB and COMS devices at the same time.

(4) The client software is based on Android4.0Socket programming, combined with the self-designed mobile phone dedicated video control, it can monitor and control real-time information on any PC or mobile phone connected to the network.

Aiming at the characteristics and deficiencies of the existing smart home control system, the present invention proposes to use the ZigBee wireless sensor network as the home control subnet, use the home PC as the home gateway and home control center, and use the WIFI wireless data communication technology to connect to the system on the Android platform. Enter the home subnet to realize intelligent control and remote monitoring of home system equipment.

First of all, the ZigBee protocol standard and related concepts are deeply analyzed, and the network topology, network configuration, network association, endpoint binding and data transmission mechanism are designed and implemented. It can complete the intelligent control of functions such as lights, curtains, range hoods, temperature and humidity, gas alarms, and human infrared.

Secondly, based on the architecture of the Microsoft MFC framework, the design method of the PC application program based on the MFC framework and the mobile device application program based on the Android platform are discussed, as well as the realization of WindowsSocket network communication under the MFC framework. The access means of WIFI network is studied, and the programming of home gateway program and the development of Android smart phone client are realized. The home gateway not only has a simple interface, but also is easy to operate and reliable in control. The smart phone client can realize the viewing and control of various information of the family.

Again, this system adopts Samsung’s ARM9S3C2440 minimum system board, based on the embedded Linux operating system, builds a BOA server on the development board, uses the camera to collect real-time video data, realizes remote wireless mobile video monitoring, and uses the client’s The terminal interface or browser accesses the development board through the wireless network to realize the real-time monitoring function of the client.

Finally, the system uses NXP's MFRC522 non-contact card swiping module and stepper motor to realize the intelligent access control function. And the GSM module SIM900A is used to realize the SMS reminder when non-family members enter the room, so that the access control system can be controlled remotely.

Although the smart home system based on ZigBee technology is a powerful system with superior performance. But for the overall implementation and application of the smart home system and the popularization of smart home, there are still many places to be improved and expanded. This will be the direction and goal of our future development.

Significance: The design of smart home is a design for people to live a more comfortable, safer and more convenient lifestyle. It is not only a technical innovation and technological progress, but also people's yearning and pursuit of a higher level of life. Therefore, the design and future development of smart home will become the goal of human beings to pursue a more advanced lifestyle. It will have profound significance for the future life of human beings.

Description of drawings

Figure 1 is an overall block diagram of a ZigBee-based smart home system.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to FIG. 1 , in an embodiment of the present invention, a ZigBee-based smart home system includes a home device node, a home master node, a home gateway and an intelligent mobile client.

The home equipment node includes the following three parts: radio frequency transceiver module, computing and control unit, sensing and execution module. As the communication interface of each network node in the system, the radio frequency transceiver module performs network wireless connection of each node device in the network and transmits and receives wireless data or instructions. The sensing and execution module of the node terminal is mainly used for the detection of unexpected disasters such as illegal intrusion or toxic gas, the collection of three meter data, and the control of various network appliances. This control or detection function needs to be completed through the operation of the calculation and control unit. The hardware core of the home equipment node in this system is the ZigBee wireless transceiver module based on CC2530. Applications where the CC2530 can be used include remote control, consumer electronics, home control, metering and smart energy, building automation, medical and more.

In the home subnet, the network coordinator FFD device acts as the main node of the home. FFD is responsible for supervising the normal operation of the network. It leads the establishment of the ZigBee wireless sensor network and completes network initialization, device control, data collection and other functions. The simplified function devices in the subnet act as home device nodes, which mainly complete functions such as sensor collection and query response. The home device nodes cannot communicate with each other, but can only communicate with the home master node. The home master node is connected to the home gateway through a serial port, and data can be uploaded to the home gateway. The home gateway is the core part of the smart home control system. It mainly completes the information exchange and information sharing between various devices in the home network, as well as the data exchange function with the external communication network. The underlying terminals of the household equipment nodes mainly include three-meter metering nodes, ambient temperature and humidity monitoring and control nodes, alarm signal collection nodes, home appliance control nodes, and lighting control nodes.

Because each ZigBee node device can only communicate with the home control center in the network, usually it can be operated by both ZigBee omnipotent devices and simplified devices. In the system of the present invention, the number of devices in a subnet is not more than 254. Each home node device can only communicate with one upper node at the same time, and this upper node, the home master node, is composed of all-round devices. The home master node exists as a coordinator in the establishment and management of the network. Since the home device node does not need to coordinate with adjacent nodes in the network, the home master node does not support the routing function. After the network is established, the terminal node can turn off the transceiver and enter the power saving mode, and start working offline without affecting the connectivity of the network. The home equipment node is used as a terminal equipment in the ZigBee network, which is composed of ZigBee communication modules, sensors, actuators and other units embedded in the home appliances. In the present invention, the household equipment node adopts the ZigBee streamlined equipment, and the household main node adopts the omnipotent equipment.

The home master node is the main control device of the home control network. It must be composed of at least one FFD device of the ZigBee network. On the one hand, it leads the entire process of establishing the home internal network, mainly including system initialization, network establishment, address allocation and membership. On the other hand, as a bridge between the home gateway and the device node, it completes the communication between the home gateway and the home device node.

The home master node, as a coordinator, is at the top of the ZigBee network. After the system is powered on, the home master node first selects an idle channel, collects active node information, and assigns a unique node number to it to complete the system address table. initialization. During the operation of the system, the main home node communicates with the home device nodes and controls them accordingly. The home master node must be able to discover changes in the network topology, such as the insertion and removal of device nodes, modify and maintain the information in the network address table, and realize the self-organizing function of the network. The specific working process of the home master node is as follows:

(1) System initialization

After the system is powered on, the home master node selects an idle channel in the network, and notifies the device nodes that have been powered on to initialize by broadcasting. After the home equipment node receives the data frame of the home master node, it generates a random number of 0-255. This random number is used to calculate the time delay of the node, and each node waits for the random time delay before sending a message to the coordinator. For the network access request, the delay time is obtained by multiplying the random number and the delay base number. After receiving the request from the home equipment node, the home master node assigns a 16-bit network address to the home equipment node, and sends the The relevant information of the home device node is recorded in the address table, and the network device is associated. If the home device node does not get a response within one minute after sending the network access request to the home master node, a random number is regenerated, and the random number is waited for. The home master node sends a network access request. The home master node completes the collection of the initial state of all powered-on home device nodes, and completes the network establishment and configuration process.

(2) Network topology update

When the network topology changes, the home master node must have the function of being able to discover this change and modify the address table information. The access and removal of device nodes will cause changes in the network topology. ZigBee network has self-organization function.

Insertion of home device nodes: During network operation, a new home device node will actively send a network access request after it is powered on. The home master node first determines whether the new home device node exists in the address list. If the new home device node The node is not in the current network address list, that is, the new home device node is not currently on the network, and the number of device nodes in the network has not exceeded the maximum capacity of the network, the home master node records the initial information of the new home device node, and Assign a unique node number to the new home device node. If the network access request of the new home device node does not get a response within the specified time, wait for a random time delay and resend the network access request. This completes the insertion of the node.

Removal of home device nodes: The removal of home device nodes can be divided into two situations depending on the initiator. One is that the home device node requests removal. After receiving the node removal request command, the home master node modifies the information corresponding to the node in the address table, recycles the node number, and informs the node that the removal operation is successful. Another kind of demolition is initiated by the home master node. If the communication between the home master node and the home equipment node fails for three times, the home master node will dismantle the node. If the node has not responded to the network access request sent to the home master node for three times, the node needs to resend a new network access request request to obtain a new network node number.

(3) Node communication function

The home device node can only communicate with the home master node, and the device nodes cannot exchange information with each other. According to the different types of data output by the nodes, the home master node divides them into two categories. The data of a class of nodes needs to be collected periodically. For these nodes, the home master node communicates with them periodically in a polling manner. Another type of device node only outputs data when an alarm occurs. The output of this type of sensor will trigger communication between them and the home master node in an interrupted manner.

The home master node not only completes the information collection of the device nodes, but also realizes the control of the nodes. Including node settings, node operations, and node restarts. The so-called node setting means that the home master node sets a certain parameter value of the node, such as the threshold value of the smoke sensor alarm. The node operation is mainly that the home master node controls the corresponding home device nodes, such as alarm disarming, lighting control and so on. Node restart means that when the control center finds that the data uploaded by a certain node has continuous errors, it can shut down the node and restart it to realize the reset function.

There are other issues that need attention during system operation. First, the monitoring of the sensor power supply is an important issue. If the sensor power supply voltage is too low, it may output wrong information, and the home master node cannot find this situation, so the correctness of the collected data cannot be guaranteed. Therefore, the home gateway must monitor the power of the device node, and when it finds that the power of the node is low, it should issue a corresponding alarm, remove the node and send the corresponding information to the remote management terminal. Secondly, in order to reduce the power consumption on the device node, when there is no data communication, let the node enter a low power consumption mode such as waiting or sleeping. The home master node must record the state of the node and be able to wake up the sensor node in an appropriate way. The ZigBee network of the smart home system is established in this way.

The present invention arranges ZigBee modules in the home environment as home equipment nodes and organizes them into a network in a wireless communication manner. The home equipment nodes are responsible for monitoring the environmental status within a certain range around, sending and receiving signals and performing data processing. The ZigBee wireless sensor network is used as a home control subnet. Network, using the home PC as the home gateway and home control center, accessing the home subnet through WIFI wireless data communication technology on the Android platform to realize intelligent control and remote monitoring of home system equipment.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (6)

1. A smart home system based on ZigBee, characterized in that, comprises a home equipment node, a home master node, a home gateway and an intelligent mobile client, and is wirelessly connected between the home equipment node and the home gateway by the home master node. 2. The ZigBee-based smart home system according to claim 1, wherein the home appliance node includes a radio frequency transceiver module, a computing and control unit, a sensor and an execution module, and the hardware core of the home appliance node is Based on the ZigBee wireless transceiver module of CC2530, the bottom terminal of the home equipment node mainly includes three-meter metering nodes, ambient temperature and humidity monitoring and control nodes, alarm signal collection nodes, home appliance control nodes, and lighting control nodes. 3. The ZigBee-based smart home system according to claim 1, wherein the home appliance node adopts a ZigBee simplified device, and the home master node adopts an all-around device. 4. The smart home system based on ZigBee according to claim 1, wherein said home master node comprises at least one FFD device of ZigBee network. 5. The ZigBee-based smart home system according to claim 1, wherein the working process of the home master node comprises: (1) system initialization; (2) network topology update; (3) node communication. 6. A preparation method based on the ZigBee-based smart home system according to any one of claims 1-5, characterized in that, arranging ZigBee modules in the home environment is organized into a network as a home equipment node in a wireless communication mode, and the home equipment The nodes are responsible for monitoring the environmental status within a certain range, sending and receiving signals and performing data processing. The ZigBee wireless sensor network is used as the home control subnet, and the home PC is used as the home gateway and home control center. The Android platform communicates through WIFI wireless data. The technology is connected to the home subnet to realize intelligent control and remote monitoring of home system equipment.