基于51单片机的一个计时测温系统：LCD显示屏上显示时间年月日和当前时刻，并显示出所处环境的温度。可通过按键调整时间。(A timing and temperature measurement system based on 51 microcontroller: LCD display on display time, month and day and the current moment, and show the temperature of the environment. You can adjust the time by the key.)