设计说明书 基于单片机控制的金属探测器系统的设计.pdfVIP

本文介绍的是基于单片机控制的金属探测器系统的设计过程和工作 理．这个系统是以AT89C51 单片机为核心,首先由555 定时器构成多谐振荡 器产生脉冲信号送入探测线圈以形成交变磁场,然后经过线性霍尔器件 UGN3503 将磁场变化转换为电压信号的变化,经过放大电路和峰值检测电路, 经数模转换之后输入到单片机中, 由单片机对数据进行软件滤波之后,与基准 值比较之后,判断是否存在金属和报警显示．系统的软件部分采用汇编语言 编写，其中采用了软件滤波替代常用的硬件滤波电路，提高系统的抗干扰 的能力．此外还对金属探测器的灵敏度和稳定性产生影响的因素进行探讨 和分析． 本文首先在绪论中对课题的背景和意义作了简单介绍。在第二章论述系 统设计的理论依据，传感器的相关的知识等总体设计过程．第三章着重描 述了系统硬件电路设计包括各个模块的设计和功能以及整机的工作 理和 工程描述,在第四章中介绍了软件的总体设计和子程序的编写。最后在结论 中简单介绍了主要的设计指标和设计的体会和本设计的优缺。 　 　 单片机，A/D 转换，传感器，探测线圈 I Abstract This article introduces the design rocess and the working rinci le of a metal detector system which bases on the technology of one-chi com uter This system is take the one-chi com uter AT89C51 as a core. .First it roduces the ulse signal by the multivibratorwhich is consisted of 555 timer and send in the detecting coil to form the alternating magnetic field, then it aso ts UGN3503 linear half-effect as rode to the magnetic field change into the voltage signal change,after enlargement electric circuit and eak value examination electric circuit,the signal be treated to send into ADC0809 modulus converter change moduluses, then the digital signal after the modulus converter is changed is sent into AT89C51one-chi com uters afterwards, after the digital filter, AT89C51one-chi com uters afterwards com ares the data to the reference voltage and judges whether to have detected the metal and alarm. The system software ado ts the assembly language to be written, and use the software digital filter to substitute hardware filter circuit, enhancing the system ability of antij amming