ABSTRACT Digital clock is used for digital circuit, minute and second figures show that for a time device, which is different from counter to the basic unit of composition, a wide range of uses, as long as there is time, the count there, it will take 10 minutes to figure The principle and structure; at the same time in the day-to-day biochemical, with its small, low-cost, travel time and high precision, easy to use, features, ease of integration by which consumers love. Widely used in personal family, the station, the Office of the terminals and other public places, it has become essential for daily life necessities. Due to the development of digital integrated circuits and quartz crystal oscillators widely used, making digital clock precision, Yun Yun watches over the old. The digital clocks to the production of people living brought great convenience but also greatly expands the original time clock function. As a result, digital clock and the expansion of its application, has a very real sense. At the same time, due to its principle of simple design is ideal for beginners to learn. The design thought of this system mainly in order to carry out a machine to use much, make use of a MCU to expand well, ascend with the solid modern living more widely the application of the field. The error of the temperature measure system is small in <=0.5 ℃; the digital clock electric circuit requests to carry out the display for year, mouth ,day,hour,minute,second.And through the keyboard to carry on cut over to two part of functions.
Key Words：Intelligence temperature measure；the real time clock ；electric calendar；LED；Time
