In view of the shortcomings of the currently developed smart windows and the fact that the traditional plantation shutters online have not been upgraded intelligently, this design proposes to set up terminal control nodes on the plantation shutters online, and use the relevant sensors and the structural characteristics of the plantation shutters online to establish a ZigBee communication network to communicate with other intelligent The home is linked to realize the functions of indoor brightness adjustment, self-closing in rainy days, anti-theft warning, etc., to overcome the shortcomings of previous smart windows and smart plantation shutters online, such as information isolation and untimely opening and closing, to create a smart home environment, protect user privacy, and facilitate life. The purpose of improving the quality of life of users. As a traditional residential structure, windows are an important part of smart homes. However, the currently developed exterior wall smart windows and smart plantation shutters online generally have a single function, work in isolation, cannot be linked with other devices, and do not open and close in time. Compared with traditional windows (push-pull type, outward opening type) and plantation shutters online, plantation shutters online have many advantages such as shading and heat insulation, privacy protection, and quick closing, etc., but they need to be pulled by traditional manpower. It is rarely valued and upgraded with intelligent development. Overall system design scheme The system design can be divided into three layers: perception control layer, network transmission layer and application service layer from the perspective of IoT implementation. The perception control layer includes human infrared sensor, raindrop sensor, light sensor, voice broadcast module, stepper Motor drive, etc.; the network transmission layer includes ZigBee terminals, ZigBee coordinators, and home gateways, that is, to realize data information and control information through the ZigBee protocol.
The mutual transfer between the perception layer and the application layer; the application service layer includes the smart home cloud platform and the user’s mobile control terminal, that is, the user controls the device of the perception layer through the mobile terminal. The IoT perspective framework of the system is shown in Figure 1. The system is divided into several subsystems according to different functions, including adverse weather self-closing and system, indoor light adjustment system, anti-theft warning system, and information transmission system. The information transmission system is responsible for the transmission of data and control instructions between the plantation shutters online terminal, the smart home cloud platform and the user control terminal, and other subsystems generate corresponding opening or closing instructions according to the priority level of the event. Subsystem hardware and function design ZigBee communication scheme ZigBee technology adopts the way of ad hoc network to communicate. It is a wireless communication technology with short distance, low power consumption and low cost. It can form three types of star type, tree type and network type. For the network architecture, the corresponding optimal topology can be selected according to the actual number of terminals. In this design, ZigBee terminal and ZigBee coordinator are mainly used. The plantation shutters online terminal adopts the ZigBee development board wireless module. The schematic diagram of the CC2530 core board is shown in Figure 3. The development board leads all the IO ports of the CC2530 to facilitate the connection with other various sensors and control devices. The terminal development board is connected to the sensor (responsible for the collection of relevant external information) and the stepper motor drive.
The module (responsible for driving the stepping motor to drive the rotation of the fan blades), the terminal is responsible for information collection, motor control and communication in the home network. The ZigBee coordinator plays an important role in networking and collaboration within the home. Indoor light adjustment The indoor light adjustment system mainly collects the indoor brightness data by the photosensitive sensor under automatic conditions, and then feeds the brightness information to the control terminal, and then controls the rotation of the stepping motor, so that the fan blades are turned over, and the indoor brightness is adjusted. , to achieve the purpose of using external natural light to maintain indoor brightness, reduce the use of electric lighting equipment, and save electricity. Indoor light adjustment is shown in Figure 4. Bad weather self-closing rainy weather self-closing system is divided into two parts: information collection and mechanical drive. The information collection consists of raindrop sensors installed on the surface of the fan blades and weather forecast information provided by the Internet. The mechanical drive consists of a stepping motor and a motor drive module. The existing smart window designs basically use a single external raindrop sensor to detect whether it is raining, and this single detection method is passively closed under the premise that it has rained, and there is often a problem that cannot be advanced in advance. It is impossible to close the rainwater entering the room in time when predicting rain conditions and emergencies. Therefore, based on this problem, in this design scheme, based on the detection of the raindrop sensor, the ZigBee communication network is used to obtain the weather provided by the weather station from the Internet. Forecast information, to achieve the effect of pre-judgment, to ensure that the fan blades are closed in a timely and effective manner, and rainwater will not enter the room. Anti-theft protection and privacy The anti-theft alarm system is mainly composed of human infrared sensors and voice broadcast modules. When someone approaches the window at a close distance outside the window, and the human infrared sensor detects the information, the voice module continues to broadcast the voice information of “someone is approaching” until the approaching person leaves or the user cancels the alarm, and the stepping motor drives the fan blades to close the window in time. The integrated smart home cloud platform sends relevant information to users. The early warning process and the principle diagram of the voice module are shown in Figure 5 and Figure 6. The system not only has the anti-theft warning function, but also protects the user’s own privacy to a certain extent. Whether it is a low-rise residential building or a high-rise residential building, the fan blades can be closed in the shortest time and effectively in the shortest time under the premise of the user’s needs to prevent the outside world. It can prevent the leakage of indoor privacy, which is a function that the existing smart windows do not have, and makes up for the long-time closing time of the existing smart plantation shutters online. System software design In the smart home system using ZigBee networking, the related wireless networking projects need to be implemented through the ZigBee protocol stack. The protocol stacks provided by different suppliers are different. In this system design, the protocol stack uses the supplier The provided protocol stack, the specific construction process will not be described in detail, to build a complete ZigBee network is divided into two steps: one is the initialization of the network, and the other is the addition of terminal nodes. There are two ways to connect to the network and to enter the network through the existing parent node.
ZigBee coordinator The ZigBee coordinator is the core node of the network and plays a role in the family’s internal.
The role of networking and collaboration is the gathering place of the information of each terminal node of the network, which is responsible for the establishment and maintenance of the network; the workflow of the ZigBee coordinator is to initialize the program after starting the device, and then establish the ZigBee network after the initialization is completed. And constantly detect and wait for the access of the terminal node, and start data transmission with the terminal device after successfully accessing the terminal device.
The terminal equipment is installed on the plantation shutters online, connected to various sensor modules, responsible for sensing and collecting external information and controlling the execution of corresponding instructions. In the home environment, each plantation shutters online is a single terminal node. The workflow is to initialize the program first, then find and join ZigBee network, in this design, each sensor (infrared sensor, raindrop sensor, light sensor, etc.) collects indoor and outdoor data and packages the data and sends it to the coordinator. The coordinator processes the data and sends it to the upper control device to realize the corresponding functions. The workflow of the ZigBee terminal is shown in Figure 8.
In program design, for the occurrence of different events, the system needs to make different judgments according to the priority, that is, for the execution of the plantation shutters online closing command, different events correspond to different priority levels. The priority levels of events are user commands, anti-theft warning events, adverse weather events, and indoor light adjustment events in descending order.
This design realizes the integration of smart windows and smart plantation shutters online in traditional functions. Compared with the shading function of smart plantation shutters online, smart plantation shutters online have more advantages in closing time due to the physical characteristics of multiple leaves and small closing rotation angle. ; The addition of ZigBee communication technology also solves the problems of independent work, no connection with external networks, and information isolation in previous smart window products, so that it no longer relies solely on itself to achieve functions, but uses the communication network. Realize information sharing and integrate into the smart home network system.
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