Design And Implementation Of Contactless IC Cards In Gas Meter

Along with in the expansion and the universality in the national scope, the gas use’s gas energy occupies more and more important position in the national policy people’s livelihood. The gas meter is a kind of calculate tool in a gas to use process, compute the gas tolerance of that the customer uses,It is basic basis of that manag-ement to conduct section charge, safety, stability, accurate of it relate to the whole normal operation that use system. Therefore, it is very important of that design a kind of credibility, safety, accurate new gas meter.This text elaborated the work principle of gas meter, the structure and principle of contactless IC Cards(call radio frequency card again), the reading and writing between the contactless IC card and gas meter. Put forward the design of gas meter and carry out a project, analysis main factor of design and problem met in the whole process and propose solution method, In the end, each parameter of a product examined attains nation standard or not.The main contents of design’s includes the hardware design of the contactless IC card gas meter, MCU programing etc. The hardware design includes a pulse sample circuit, saving circuit, display module, valve control circuit, reading and writing module, power supply and electricity quantity examination circuit, Alarm circuit, MCU module.The electric circuit core adopt the PIC16F73MCU of Microchip company, the IC card read and wrote module adopt FM1702SL chip of Fudan micro-electronics company to read and write chip.MCU program design mainly includes the design that the IC card reads and writes procedure and sample calculation and processing program design etc.It is seen from the examination result of sample to effect of product thrown in the market that this product comes to a national related standard and obtained an expectation achievement.