A method to devise a digital precision barometer is illustrated in this article.The barometer can display the barometric pressure value which measure in time.The sensor outputs the voltage signal responsing to the air pressure.The singal is converted by V/F converter.then inputted into single chip microcomputer(SCM)and displayed on LED synchronously.This kind of barometer is portable.Easily operated and absolutely accord with the design requirement.
In the paper mainly introduced single chip microcomputer the development as well as the ATMEL AT89C2051 single chip microcomputer unique feature and the important pin meaning elaborated the design and implementation of digital barometer base
on single chip microcomputer, including air pressure use, V/F converter design, single chip microcomputer pin use as well as LED display circuit turning on