This design by data display module, temperature acquisition module, time processing module, speech broadcast module and set module five modules. The system the biggest characteristic is reflected a strong human-computer interaction and independent of the modular design program. The DS1302 clock chip realize clock, temperature gathering choose DS18B20 chip, using voice chip ISD1420 chips are introduced, the data suggest that the 12864 LCD module, in the first line that year, month, day, the second line shows, minutes and seconds, and the third row that week, the fourth row, display temperature and the alarm switch, the reasonable use of liquid crystal display area. AT89S52 devices using the chips timing suspensions time, control the liquid crystal display update, the temperature changes and read key real-time processing, and for alarm clock, is actually in the time of a nested program. The value of time and alarm button set, using universal twenty-four hours system. This circuit adopts 51 SCM as the core, power consumption is small, can be in 5 V of low-pressure work, voltage can choose 5 ~ 6 V voltage power supply.
To sum up the calendar has read the convenient, direct display, functional diversity, simple circuit, low cost, and many other advantages, conform to the trend of the development of electronic instruments, and has a broad market prospect.
Key words: calendar; The thermometer; The alarm clock; LCD display; Speech broadcast