In the paper,a temperature control system is described.The system adopts AT89C51 as the control core,uses DS18B20 temperature sensors,LM041L LCD displays and 4×4 matrix keyboard as expended device.It achives the functions including control of two heating circuits and two cooling circuits,the setting and display of the ambient temperature and the current temperature of the controlled substance,as well as that the modification and display of the controlled material mass and specific heat capacity are realized.The system is simulated and tested by the simultative software proteus and keil.
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