任务：设计并制作一个以单片机为核心的温度测控系统

设计要求：

①. 被测温度范围为0—100℃。温度测量误差范围小于5℃，能进行当前环境温度调校。

②. 测试问题通过4位LED数码管显示。

③. 温度下限 L为30℃，上限 H为50℃。当温度≥50℃时，模拟发光二极管全亮。当温度≤30℃时，模拟发光二极管全灭。当30℃≤温度≤50℃时，输出占空比=（H-t）/（H-L）。

④. 发挥部分：可按键设定温度下限值和上限值。

-Task: Design and production of a microcontroller as the core temperature control system

Design requirements:

①. Measured temperature range of 0-100 ℃. Temperature measurement error less than 5 ℃, the temperature can be adjusted the current environment.

②. Test questions by four LED digital display.

③. L minimum temperature of 30 ℃, maximum H was 50 ℃. When the temperature ≥ 50 ℃, the simulation of all light emitting diodes. When the temperature ≤ 30 ℃, the simulation of light-emitting diode Quanmie. When 30 ℃ ≤ temperature ≤ 50 ℃, the output duty cycle = (Ht)/(HL).

④. To play a part: You can set the temperature button and the upper limit of the lower limit.