Abstract
Electronic perpetual calendar which is an application of the single-chip processor system,
is utilized by combining hardware and software. And Hardware is composed of five modules:
Main control unit, clock circuit, temperature test circuit, display circuit, keyboard interface.
Main control board adopts AT89S52, clock circuit adopts the DS1302 clock chip, display
module adopts the LED digital tube, and temperature test adopts the DS18B20 temperature
sensor, keyboard interface circuit is completed by connecting ordinary button with pull-up
resistor. Software takes advantage of C to program, so as to realize the programmed control of
single-chip processor. Single-chip processor gets the time data through using the DS1302
clock chip. The DS18B20 gathers temperature signals and transmits them to single-chip
processor. Then, single-chip processor transmits the time data and the temperature data to the
74LS154 decoder. Lastly, the LED displays solar calendar year, year, month, day, hour,
minute, second, alarm clock, week and temperature with being enlarged and driven by the
C9015 triode.
Keywords: Electronic perpetual calendar; single-chip processor; temperature sensor; clock;
digital display
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