Abstract
The design aims to use low-cost price temperature detection and display, and the outside world is controlled by electrical appliances, so that the object was to control temperature control in the set temperature range, the design uses a temperature sensor for thermal resistance, thermal resistance the resistance will keep the temperature changes, thus changing the resistance, the use of this feature, after AD conversion to the single-chip processing, the temperature value, and through two digital tube display, temperature detection range of 1-99 degrees, 51 Series single-chip microcontroller, model AT89S52, digital tube using a total of Shenyang-based digital control, dynamic scan mode drivers, and through PNP transistor gating time, through three LED displays the current temperature and set temperature Comparing the results, and through NPN transistor to control the action or relays.
Key Words：Thermistor; TLC549; AT89S51; Singlechip thermistor temperature detection
