智能温度控制系统分为4个部分：显示器、加热器、控制过程和反馈回路。其中，温度检测电路是通过传感器检测来设计的。摘要采用光耦合器模型，实现了功率控制电路，其控制对象为1 kW电加热器，具有220伏交流电;键盘和显示电路SMC1602A包含四个按钮和LCD显示，以实现人机交互;基于单片机STC89C52。
Journal of Harbin instilule o/ Technology New Series Vol 21 /O 3 2014 R R 3 VCO 360 33 P10 HEAT M0C3041 R4 P13 89C52 100 74LS04 300 Fig 4 Power control circuit a Key board circuit 3.3 Water Level detection circuit For cost saving we design the water level detection circuit by means of conductivity of water. As H12 shown in Fig. 5 three metal bars are respectively P05 Ok PO installed at different height of the water tank The bar DBO a is al the bottom ol the waler lank and connected will a power supply of 5 v the bar B and C represent the lowest and highest level which ground through a DBS 3 DB6 resistance. When the waler level is below bb and C are all higher than the water surface and then no BL+16 +5 electricity the status of b and c is 0". At the same b Display circuit time the system gives the alarm signal and the Fig 6 Keyboard and display circuit indicator light of less water works and the electromagnetic water valve is turned on to inject VCO waler when the waler level rises lo b a and b are connected the status of b is 1and c is 0". The alarm signal disappears and the indicator light of PE5 R39 normal works. When the water level rises to cC and 10K C8550 b are connected and the status of b and c is "1" then 「S1 the valve is closed and stop injection +5o SPEAKER 50k×2 Fig. 7 The alarming circuit 4 Test results A Fig 5 Water level detection principle diagram 4. 1 System Testing Instrument There are many instruments used in our test such 3. 4 Keyboard and Display Circuit as dual tracking voltage and current stabilized power Keyboard with four keys is directly connected with supply DIl1718E-5 digital oscilloscope Tektronix the microcontroller P port as prefabricated TDS1002 emulators WEIFUE6000/L Multi temperature input port setting in Fig W e choose function digital meter GDM-8145 Pc P4 LCD1602 5 16x2 character dot matrix lcd screen CPU2.4 a thermometer electric healing cups and a liquid crystal display circuit which can achieve stopwatch human -com puter inte ion such as prefabricated 4.2 Test results Temperature and real delection of Lemperature as 1 We put 1 litre water into the thermostat shown in fig.6 b electrothermal cup and change its temperature. We can 3.5 Alarming Circui observe the temperature value on liquid crystal display a buzzer and a light milling diode consist of the LCD1602 while we measure the real temperature alarming circuit as shown in Fig. 7. When the water with a thermometer and record the results as shown in level of the tank is lower than the floor the buzzer Fig 8 gives out the alarin and the systen Turns on the light of We can conclude that the static temperature less water otherwise when the water level of the tank sensor measurement results and actual measurement of reaches the upper threshold the system turns off the the thermometer is consistent. Therefore the results of light ol less waler and turns on the light of normal waler measurement with temperature sensor are reliable and the system can comply with the design requirement 3 21994-2014ChinaAcademicJournalElectronicPublishingHouse.Allrightsreservedhttp://www.cnki.net Journal of Harbin instilule o/ Technology New Series Vol 21 /O 3 2014 advantages such as easy to control low cost and high aved temperature tem perature flexibility References 1 Wei IG liang X C. Design of an intelligent temperature control system based on the fuzzy self tuning PID. Procedia Engineering 2012 43 307-311 2 Xu JQ Wany X Z Yu G Y. Industrialized culture water temperature contre esign and Automation Instrumentation 20131 66-68 Case modeling and simulation. Physics Procedia 2010 25 Fig8 The static temperature results 4 Zhang Zhao A 1. ITou J 2 The largel temperature is set 75 C. 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Application of hybrid fuzzy PID in Gelaton re control sy 0060%1201501802024027303303603 Xiamen University 2008 472 191-195 imeis) 9 Liu C w Chua Y K. A study on an optimal approach Fig9 The dynamic temperature results ol strategy of condensing water temperature for energy saving. International Journal of Refrigeration 2011 34 816-823 By comparison we can see that the measured 10 Zhen L. Zhang J I. Chen Y P et al. Fuzzy control model temperature and the real temperature consistent in the and simulation of supply air system in a test rig of low process of heating and errors are in the permitted temperature hot-water radiator system. Energy and range. Although there are errors they can not affect Buildings201042386-392 ults. Therefore our system reaches design Li J Y Feng M X. Temperature decoupling control of rements louble-evel air llow field dynamic vacuuM syslem based on neural network and prediction principle. Engineering 5 Conclusions Applications of Artificial Intelligence 2013 26 1237 1245 12 Feng Y. Design of temperature control system based on Th Is paper focuses on the application of single AT89C52. Journal of Weinan Teachers University 2011 hip microcomputer in temperature control. We use 26249-52 single chip microcomputer AT89C52 as the control core 13 Zhan mart temperature sensor DS18B20 and its and design the intelligent control system with the application. Instrumentation Technology 2010 4 68-70 temperature real-time acquisition and control. The test 14 Yu Chunhe Zhang Danping. An artificial intelligence results show that our design is reasonable and achieves central air-conditioning controller. Advances in Intelligent svstems201213819-25 the desired effect. The system realizes the intelligent 15 Sui QJ. Interlace design and simulation uf LCD1602 based temperature control at the same time it has many on PROTEUS. Microcomputer Information 2010 26 7 1171-172 )4 21994-2014ChinaAcademicJournalElectronicPublishingHouse.Allrightsreservedhttp://www.cnki.net