Abstract
Temperature is so important for life, so designing a high reliability, flexibility, ease of temperature control system is necessary. This issue introduces to STC89C52RC MCU as the core principle of temperature control systems and design methods. Temperature signal from the temperature of chip DS18B20 acquisition, and digital signals transmitted to the microcontroller. In this paper, the control system hardware, including: temperature sensing circuit, temperature control circuit, the temperature display circuit, and some interface circuits. SCM signals through the corresponding treatment in order to achieve temperature control. The paper also illustrated the way in order to highlight the various parts of the circuit and software design, where the modular structure, the main module: the main program, digital display subroutine, keyboard scanning and key processing subroutine, the temperature setting child procedures, and procedures for the DS1820. The system can realize real-time temperature measurement and display of digital control, through switch displays the current temperature and set temperature, adjust the temperature level, when the temperature is below the set temperature LED1 on, LED2 light above the set temperature while switching relays on the heater temperature control. Keywords: MCS-51 microcontroller; DS18b20; temperature measurement
