单片机综合应用实验设计——低频信号幅频综合检测

Design of the Experiment of the Comprehensive Application of Single-chip Microcomputers--The Amplitude-frequency Comprehensive Detection of Low-frequency Signals

针对单片机综合应用实验设计,该文设计了低实验成本的低频信号幅频综合检测实验。实验涉及了单片机定时器、外部中断、AD接口技术以及电子测量技术等知识综合应用,知识考查面广。该文提出的幅频检测方案利用放大和整形电路将待测信号转换成单片机可识别的二值信号,再通过单片机利用测频法测出信号频率;利用具有电压负反馈的峰值保持电路和AD转换器采集待测信号的幅值。实验结果表明设计方案可行。通过实验可提高学生的创新实践能力,培养学生查找问题、分析问题和解决问题的能力。

Aiming at the design of the experiment of the comprehensive application of single-chip microcomputers,this paper designs the experiment of the amplitude-frequency comprehensive detection of low-Frequency signals with low experimental cost.The experiment involves the comprehensive application of knowledge such as the timer,external interrupt,AD interface technology and electronic measurement technology of single-chip microcomputers,and it examines a wide range knowledge.The amplitude-frequency detection scheme proposed in this paper uses the amplification and waveshaping circuit to convert the signal to be measured into a binary signal that can be recognized by the single-chip microcomputer,then uses the frequency measurement method to measure the signal frequency through the single-chip microcomputer,and uses the peak-holding circuit with negative voltage feedback and AD converter to collect the amplitude of the signal to be measured.Experimental results show that the design scheme is feasible.Through experiments,students'innovative and practical ability can be improved,and their ability to find,analyze and solve problems can be cultivated.