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Coins play a very important role in people’s life, and with the increase of the population and the improvement of social civilization, the amount of coins needed will increased greatly. As the substitute of paper money, coins bring our life much convenience, and many problems as well. Some special departments, such as banks, have to deal with coins efficiently so as to put coins into circulation again, for example, counting the numbers of coins, dividing coins and packaging coins. Automatic ticket cars, public telephones, etc, which need coins, must discern coins in-time, and automatic teller machines have to fulfill the function of automatic charging. Furthermore, with the appearing of fake coins, the task of discerning fake coins in-time becomes an urgent problem. And then the coins counting and discerning system comes into existence. The article put forward a practical and reliable project for coins counting and discerning system at the base of essentiality of coins counting and discerning, and aiming at the current situation of coins counting and discerning in the world. The system, arguing in the article, adopts the multi-CPU system composed of DSP and MPU, and realizes coins counting and discerning with high speed and high accuracy. The article introduces the principle of coins detecting and brings forward a plan which detects coins from three hands, such as frequency, amplitude and phase. And the article describes the hard-software design of the Data Signal Processing chip, TMS320VC5402, the design of man-machine interface, and the device of the communication between DSP and MPU particularly.
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