基于AVR单片机的硬币识别系统设计

为减弱市场上高仿真假硬币的传播,设计了一种以AVR单片机为控制核心、以电容传感器和电感传感器为检测手段的硬币识别系统。该系统通过电容和电感传感器把硬币大小和材质的差异转化为电压和频率的差异,测出其电压值和频率值,将得到的数值与单片机内部存储的真币数据相互进行比较,达到辨别硬币真伪的目的。经过测试,系统可以判别出假硬币,准确率达98%,基本满足市场要求。

Based on the single-chip microcomputer avr coin identification system

In order to welcome the spread of high quality counterfeit coins , we designed a coins-rec-ognition system which is controlled by Atmega128 single chip and employed capacitance sensor and in- ductance sensor as the test means . This system translates the difference in the meterials of the coins into difference voltage and frequency through capacitance sensor and inductance sensor and then meas- ures the voltage and frequency value . To achieve the goal of distinguishing the real coins from falee ones , this system compare these values with the values of real coins which arstored in the single chip After test , this system can recognice the falce coins . The accuracy rate is 98% . And it can basi-cally satisfy the market demand .