使用HD44780兼容型LCD为显示模块，程序执行时，利用89C51来驱动LCD显示器运行，显示出当时温度及设定的温度值。用户可以从4*4键盘输入数字，来设置预定温度

-The use of HD44780 compatible LCD to display module, program execution, using 89C51 to drive the LCD monitor is running, showing that the time temperature and setting temperature. The user can enter a number 4* 4 keypad to set the scheduled temperature