Application prospect
With the continuous pursuit of quality of life and the continuous development of residential intelligent technology, the configuration of smart home systems is getting higher and higher, and has more rich content.
The basic functions of the smart home appliances including intelligent control, intelligent lighting, electric curtains intelligent remote control, burglar alarm, entryphone, fire alarm, gas leak detection, remote meter reading (water, electricity, gas), network communication, video on demand, Smart air conditioners, smart water heaters, etc., more and more fresh nouns have gradually become an important part of smart home systems. At present, tens of millions of homes around the world have installed home network products. It is predicted that the demand for home network products will continue to grow substantially in the future. With the rapid and sustained growth of China's economy, the demand for future home networks has also shown a strong growth trend. Among them, smart water heaters, as an integral part of smart homes, have broad market prospects.
The use of water heaters covers a wide range of markets, including homes and hotels. At present, there are mainly electric water heaters, solar water heaters and gas water heaters on the market. In terms of domestic specific conditions, many water heaters now use manual manual adjustment or infrared remote control. The traditional remote control method of household appliances generally uses infrared remote control, but infrared remote control requires no obstacles between the remote control and the body, so it cannot be worn. wall. With the development of technology and the improvement of people's requirements, this function is increasingly unable to meet the requirements of users. To this end, we have developed a water heater with RF wireless remote control and network control, which allows users to control the switch of the water heater at home and in other parts of the office, which greatly facilitates the user and is a breakthrough in the traditional way.
2. Product Features
The schematic diagram of the water heater product is shown in Figure 1. The features are as follows:
1 The scheme consists of a network controller, a remote controller, a water heater controller, and a network server. The controllers can independently form multiple independent systems to control the water heater. As shown in Figure 1, the water heater can be arbitrarily selected. control method.
2 Network control The main chip uses Microchip's Internet access application for embedded systems. The 8-bit integrated Ethernet control chip PIC18F66J60 is developed, and the TCP/IP protocol stack based on this chip is embedded in Microchip.
3 wireless remote control chip using the United States Intergration company's IA4421, remote control distance of up to 100 meters, at least can penetrate the 20CM wall for remote control.
4 The network controller and the water heater controller are controlled wirelessly to avoid wiring troubles caused by the installation of the water heater.
3. Network server architecture
The network server is a device that implements communication between devices and external devices in the home network, and is the core component of the home network. Through the devices in the home network, information can be exchanged with the telecommunication network, and information interaction between internal devices can also be performed. The network server establishes a unified data processing center within the home, manages the internal data of the home, and connects to the carrier network externally. It is defined as: a simple, intelligent, standard, and flexible entire home network interface unit that can receive communication signals from different external networks and transmit signals to various devices over the home network. Two main features of a home network server based on a telecommunications network are broadband access capabilities and IP-based data processing capabilities.
The network server developed by our company for smart water heaters is based on network TCP/IP communication, and accesses the water heater through the C/S structure. It integrates database service, SMS service and Web service to provide users with remote control and monitoring functions for the heater. Its simple structure is shown in Figure 2:
Figure 2 network server architecture
4. Receive control system design
Figure 3 receiving system framework
The main block diagram of the hardware of the receiving control system is shown in Figure 3. This paper only introduces the network interface circuit and wireless circuit part which are more important.
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