毕业设计45毕业设计 硬币识别器

毕业设计（论文）题目:硬币识别器

摘要

科技的发展带动了社会的发展，城市的公交系统也是社会发展夫人一种体现于是公交系统的更新换代也是在所难免，车载的投币系统经历了多次的发展过程，而假币的出现将投币器上升到了一个新的高度，投币器必须加入货币识别系统，硬币识别器是一种与投币器结合使用的仪器。使用方便、检测精度高并且有广大的发展前景。

硬币识别器只要识别现在国家发行的一元、五角、一角的硬币。我国目前发行的1元,5角和1角硬币的金属原材料是为造币而专门使用的特殊合金,因此在它通过投币入口进入由电感和电容组成的特定传感器,金属材质和体积的差异对电容量和电感量的影响大小也出现微弱差异,电容量、电感量的变化引起电压的变化;再通过检测电路将信号放大,与设定值进行比较,确定某种硬币种类后,通过数字信号传输到单片机控制电路完成对金属硬币的识别。

关键词：电容传感器、电感传感器、检测电路、单片机控制电路。

2007年06月

Abstract

The development of technology led to the development of our society. The city bus system is a social development embodied his wife then transit system upgrades are inevitable. Vehicle coin system has experienced a number of the development process, and the emergence of counterfeit money for coin rose to a new height, coin device must join the monetary identification system for identification of coins is a coin with the combined use of the equipment. Easy to use, high precision and broad development prospects. Clifton coins now identify as long as a national issue, 2.50, 3.10 coins. China currently issued by the dollar to 50 cents and 10 cents coins metal materials for the exclusive use of mints and the special alloy, So it through the entrance into the coin by the inductance and capacitance of specific sensors, The metal material and size differences of capacity and inductance of the size differences have emerged weak, capacity, inductance voltage changes caused the change; through the detection of the signal amplification circuit, and setting values, identify certain types of coins, digital signal transmission to the MCU control circuit completion of the identification of metal coins.

Keywords: Capacitance sensor Inductance Sensor Detection Circuit SCM control circuit

2007.06

目录

摘要 ................................................................................................................... I

ABSTRACT............................................................................................................. II 目录 ............................................................................................................... III

第1章绪论 (1)

1.1硬币与识别器的发展 (1)

1.1.1硬币的发展 (1)

1.1.2 硬币识别器的发展与分类 (4)

第2章总体设计方案 (6)

2.1总体设计思路 (6)

2.2总体方案的确定 (6)

第3章电路与程序设计 (9)

3.1电路设计 (9)

3.2各组成电路原理与应用 (10)

3.2.1电桥电路 (10)

3.2.2测量放大电路 (11)

3.2.3整流电路 (13)

3.2.4滤波电路 (17)

3.2.5电压比较器 (19)

3.2.6 AD转换器 (22)

3.2.7单片机介绍： (23)

3.2.8 AD574 和8051 单片机接口电路设计： (28)

3.2.9光电耦合器 (31)

3.3机械部分设计 (32)

结论 (33)

谢辞 (34)

参考文献 (35)

附录 (36)