Abstract: According to the characteristics and shortcomings of winter heating system in northern China, an indoor intelligent temperature control system based on embedded system ARM-Linux platform and fuzzy control technology is designed. The DS18B20 and ZigBee wireless networking technology are used to complete multi-point temperature acquisition. The fuzzy control technology is used to achieve accurate control of indoor temperature. The QT user interface is established, the human-computer interaction environment is optimized, and the remote control of the system is realized by GPRS technology. , to bring great convenience to users. The realization of the system will play an important role in reducing heat energy waste and improving people's quality of life.
Today, the promotion of energy-saving emission reduction and the pursuit of high-quality life, the shortcomings of the winter heating system are increasingly apparent. Most of the northern cities in China use central heating. During the whole heating period, no matter whether there are people or no people in the room, the system is continuously heating all day. The heat transfer of the system is constant, and it cannot be changed according to the indoor and outdoor temperature changes and the individual's room temperature. Requires appropriate adjustments. This has caused serious waste of heat and inhumanization of heating. This paper designs and implements an indoor intelligent temperature control system based on the embedded system ARM-Linux platform. By detecting the indoor and outdoor temperature changes in real time, the indoor temperature is reasonably adjusted, the heat energy consumption is reduced, and people's quality of life is improved.
1 system function and overall structure
The hardware block diagram of this system is shown in Figure 1. It is mainly composed of ARM9 controller, temperature detection module, touch screen display module, ZigBee wireless transceiver module, heating control module and GPRS module.
Figure 1 system hardware block diagram
Among them, temperature detection includes outdoor temperature detection, indoor temperature detection and heating temperature detection. In order to avoid cumbersome wiring, each temperature detection point is wirelessly connected to the ARM controller through Zigbee technology to form a star wireless network. The temperature values ​​of each detection point are wirelessly transmitted to the ARM controller through Zigbee. The ARM controller performs comprehensive processing analysis according to the received temperature values ​​of each point, and outputs corresponding control signals to the heating control module, thereby realizing intelligent adjustment of the room temperature. The information display and input module is realized by the LCD touch screen to display the current indoor temperature and the input temperature value, and can set different working modes such as low temperature and room temperature. The ARM controller is wirelessly connected to the outside via GPRS, and the user can remotely control the working mode of the system at any time through the mobile phone. For example, on the way home, the user can switch the system working mode through the mobile phone. When returning home, the room temperature has risen to the normal temperature, which brings great convenience to the user.
1.1 ARM intelligent control module
The ARM intelligent control module consists of ARM9 controller, FLASH, SDRAM, power and reset module, LCD touch screen and related peripheral circuits. The system uses SAMSUNG's ARM920T core-based processor S3C2440 as the controller. The S3C2440 processor is powerful, cost-effective, and low-power. In addition to the bus and SDRAM controllers that are commonly found in embedded chips, the S3C2440 processor also has a rich expansion interface to facilitate the construction of peripheral circuits.
The LCD touch screen uses the TFT type LCD module TD035STEB1, which uses LTPS TFT as a switching device and integrates a four-wire resistive touch screen and backlight circuit to simplify peripheral circuits. The system establishes a QT/Embedded-based graphical user interface (GUI) based on the touch screen to realize the display and control input of information, optimize the human-computer interaction environment, and bring great convenience to users.
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