总体电路设计是用DSl8B20作为温度检测计，将电路上电后可以测试温度，通过数码管显示。还可以通过按键来设置上下限温度。当温度超过范围，LED灯点亮，模仿开关的关断。利用89S51单片机的定时/计数器和外部中断功能，来完成测试温度和报警的功能，其结果通过数码管显示出来。-Overall circuit design is DSl8B20 as temperature detector, the circuit can be tested after power on temperature, through the digital display. You can also set the upper and lower temperature button. When the temperature exceeds the range, LED lights, imitating the switch off. 89S51 microcontroller using the timer/counter and external interrupt function, to complete the test temperature and alarm functions, which resulted in the adoption of digital tube display.