【Abstract】
As the times progress and development, human constant demand, technological progress. Thermometer, given the convenience of mankind is undeniable, in which the digital thermometer is a typical example, but it have become increasingly demanding. Due to the low accuracy of old-fashioned thermometer, measuring range is small, does not meet modern life: industry, teaching, research, and tourism demand in various fields. With the integrated circuits technology, single-chip micro-computer features are also growing, due to microcontroller technology has spread to our lives, work, research in various fields has become a relatively mature technology, this article describes a control based on single chip digital thermometer, it belongs to multi-function thermometer. The design presented in digital thermometer with a traditional thermometer, compared with a reading convenience, temperature measurement accurate.The thermometer in order to AT89S51-based controller, through the DS18B20 to detect the temperature, and through four common anode LEDdigital tubes, serial transmission of data to achieve temperature display. You can set the alarm off the assembly line at the same time the temperature is set when the temperature is not within the scope when it could be reported. Digital thermometer is a single bus device, with a simple circuit, small size and characteristics. Therefore, use it to form a temperature measurement system with a simple circuit, in a communication line can carry many of these digital thermometer is very convenient.
【Key words】
SCM: digital control; thermometer; DS18B20; AT89S51