Abstract
In this paper, as the core of 51 single-chip temperature control system design, and describes its hardware and software design methods and gives the system schematic diagram of the hardware, software flow chart. The design uses high-precision Instruments TMP101 digital temperature sensor for accurate temperature measurement, using I2C serial communication data transmission will be measured to the single-chip processing. PID algorithm using single-chip heating and refrigeration equipment for the implementation of the PWM control mode, and ultimately to achieve temperature control. The use of keyboard and LCD display on the temperature setting, and PID parameter changes.