Rapid-response device for identifying counterfeit coins based on PIC16F886

TANG Xiao-jun， QIN Hui-bin
（College of Electronic Information， Hangzhou Dianzi University， Hangzhou 310018， China）

Abstract： Bacause of unstablity of currency circulation in the market， it is difficult for people to dinstinguish fake money from true money. In order to solve this problem，PIC16F SCM combined with eddy current sensor technology was adopted on the system of identifying counterfeit coins. The device was designed to produce the different signal according to the suitation of throughing the eddy-current sensor through using the system of PIC16F886 SCM. The design of the project is not complexity. Indeed，it shows an optimum expression on speed，precision and price comparing with other similar products. Several tests and experiments illustrate an ideal result with about 100% identifying real coins，95% counterfeit coins and 900 pieces of coins checking per minute. At the same time，its diverse range of figuration can be tuned to apply in different public places，including bus，automatic seller machine，self tickets machine on subway，payphone，entertainment places，etc..
Key words： PIC16F886； micro contionoller unit（MCU）；eddy sensor；accuracy of data collection；recognition rate；fake money detection