本文闡述了基于低功耗單片機的智能綜合儀表的研究和開發(fā)。從硬件方面的通用信號調(diào)理、基于PWM 的DAC 的實現(xiàn)、點陣液晶顯示、按鍵處理、串行FLASH 存儲、實
時時鐘、RS485 通訊以及軟件方面的數(shù)字濾波、數(shù)據(jù)處理、數(shù)字PID 控制、系統(tǒng)運行顯示、系統(tǒng)組態(tài)、數(shù)據(jù)存儲追憶、實時時鐘等等方面的技術(shù)要點進行了介紹。最后簡單介紹了系統(tǒng)軟件總體結(jié)構(gòu)設計。
關鍵字: 儀表；低功耗；RS485；輸入電路
Abstract: The thesis presents the research and analysis of the intelligent multi-function instrument based on low cost MCU. The technology point of the all-purpose signal measure, DAC based on PWM, lattice LCD display, key disposal, storage on serial FLASH, real time clock, communication on RS485 of hardware and digital filter, data disposal, digital PID control, system circulating display, system configuration, data storage and remembrance, real time clock of software are took apart and dissertated concretely. At last, the main structure design of the system software is introduced in general.
Keywords: Instruments; Low Cost; RS485; Input Circuit