Research And Design Of Electronic Prepayment Watt-hour Meter Based On Mcu And Rfid Card

Through the study of MCU and RFID card techniques, electronic prepayment watt-hour meter based on RFID card is designed based on techniques including electronic electricity power measurement chip, liquid crystal display, EEPROM storage and linear regulated-voltage electricity power.Merits of electronic prepayment watt-hour meter based on RFID card are analyzed, development meaning of electronic prepayment watt-hour meter based on RFID card is stated, study objective is proposed and technique requirements are given in this thesis.Mifarel S50 RFID card is used as data transportation media in this thesis, which solves difficult problems of non-resource and touch-free.Design idea of hardware development of electronic prepayment watt-hour meter based on RFID card is given in this thesis. Selection principle of MCU and the problem of resource allocation are discussed, hardware realization of key modules, such as radio frequency read-write module, power measurement module, liquid crystal display module, load control module and power source module, is investigated.In this thesis, MCU software function of electronic prepayment watt-hour meter is realized, main process of function realization of electronic prepayment watt-hour meter is given, MCU software, such as radio frequency read-write module, measurement module, display module and storage module, is investigated, design idea and key procedure are obtained and design idea of software is discussed for management safety, data transportation safety, procedure maneuverability of clients'utilization of electricity and payment compatibility, corresponding design principle is given and important portions of design are analyzed for hardware design of radio frequency read-write module, parameter selection and adjustment methods.Based on the foundation of hardware design of electronic prepayment watt-hour meter and software techniques, the study objectives, such as the safety of data transportation media, the practicability of MCU selection, the correctness of power measurement, convenience of error adjustment, reasonableness of software and hardware design of radio frequency read-write module, generality of data and information display, reliability of storage, safety of read and write and utilization of electricity and management function, are realized.The electronic prepayment watt-hour meter designed in this thesis has passed related software and hardware tests, works stablely and reliably, satisfies proposed technique requirements fully and confirms the effectiveness of the design method.