5、,andusingthe8255AchiphasexpandedtheAT89C51I/Oport.Systemusesamodulardesignconcept,throughtheCprogramminglanguage,themainprogramfortheA/Dconversionmoduleandliquidcrystaldisplaymodule.Finally,systemconductsthesoftwareandhardwaresimulationontheProteusplatform,realizingthe requirements of