Research On A System For Detection And Differentiation Of The Coin

The system for detection and differentiation of the coin counts the high-speed coin that passes, rejects to the bogus money, incompletes coin at the same time. It is the foundations of numerous researches and development of dealing with utensil of coins, such as sorting machine, counting machine, packer, destroying machine of the coin, etc... This article spreads from the principle and characteristic of electric whirlpool sense, according to the characteristics, such as size, material of Chinese coin system, designs double-way electric whirlpool sensor made of low frequency transmission electric whirlpool sensor and high frequency reflection electric whirlpool sensor to detect different characters of coins. The article discusses the performance characteristics of the two kinds of sensors when they were used to detect corresponding coins and designs the corresponding sensor circuit. The system, multiple-CPU system, comprises three modules of data gathering, data processing, and man-machine interface. On the one hand, these modules work independently and every module has its definitude work. On the other hand, they cooperate closely and transmit data and command one another through dual-port-RAM. In the man-machine interface module taking CPU1 as the core, the article reject and show that drives module with the membrane determinant keyboard module section electrical machinery after designing the liquid crystal. In the module system of data processing taking CPU2 as the core, have designed the data processing algorithm of this suitable system. In the module system of data gathering taking CPU3 as the core, the article describes the circuit of signal-arising of sensors, signal-converting of sensors, and data gathering using counters. In the software, we have designed the programs of LCD display, button dealing with, and the eigenvalue picking-up. Meanwhile, the problem of communication of multi CPU system was solved well by the combination of hardware and software, thus make the clear subsystem work in a coordinating, steady state.