Coin Recognizing And Detecting Device

The modern human society pursues convenience,to which the common use of coins' automatic circulation technology is a typical illustration,such as automatic vendors,pay phones, arcade games and self-service ticketing buses. However,nowadays people's social morality has not been universally improved, so that there always is the phenomenon that some people use fake coins replace real ones.Hence,it becomes a necessary technology method to install coins detecting instrument in the coins automatic circulation facility. There are coins detecting instruments in the market at present already, but because of the technology disadvantages of hardware structures or the software arithmetic, Which always lead to the high cost and low accuracy.This paper will detailed expatiate a design and practical technology of low-cost and high-accuracy coin recognizing and detecting device. Propose the use of double channel eddy current sensor to test the coin material, thickness and other parameters by introduce the fundamental principle of eddy current sensor to improve the coin identification detecting rate. At the same time, for the elimination of different coin initial velocity of the impact of frequency measurement, using least squares fitting algorithm, access coins through the coin road, the average amount of time corresponding to the characteristic frequency as the standard value, the coins through the coin road detection time interval compared with the average amount of time and frequency characteristics of the measured linear least square fitting based on coins converted into an average time interval by detecting the value of the characteristic frequency and characteristic frequency of the value of the standard value in order to determine the authenticity of coins.This instrument has the learning function. It can store the material characteristic of the real coins in the EEPROM memory through the learning of all kinds of coins on the market, and use it as the standard to judge the coins are real or fake ones. Otherwise, this system has the upgrading online function. If there appears new kinds of real coins on the market,only starting the learning function and storing the new coins' material characteristics in the EEPROM memory can add the function to detect the new kind of coins. The device also has alarm function, can be the voice of alarm on the counterfeit money.