单片机控制的多路数据采集系统doc资料.docVIP

毕业论文 单片机控制多路数据采集系统摘 要 本设计主要完成了基于AT89S51单片机控制的数据采集系统的硬件电路设计以及相应的软件设计。本系统的硬件设计主要包括：多路转换开关及前置放大电路的设计，采样保持电路的设计，模数转换电路的设计，数模转换电路的设计。多路转换开关及前置放大电路的设计中重点介绍了多路开关的选择、AD521放大倍数的计算以及多路开关CD4051和放大器AD521硬件连接。采样保持电路的设计中重点介绍了采样保持电路的原理和主要参数以及采样保持器的选择和连接电路。模数转换电路的设计中重点介绍了系统A/D通道的选择和A/D转换器的各项误差分析以及A/D转换器AD574的介绍、输入方式和连接电路。数模转换电路的设计中重点介绍了D/A通道的选择，D/A转换器的选择以及D/A转换器DAC0832的介绍、连接电路和DAC0832的输出方式。设计中还介绍了单片机的选择，单片机AT89S51的时钟电路和复位电路。本系统的软件设计主要包括编译器的选择，各部分的流程图以及程序的设计。设计中还分析了系统的性能及误差。时间紧凑以及自己的知识水平有限等原因，对所设计的整个系统进行调试及仿真，因而也就没能做出实物出来可能有很多问题还没有发现，希望老师和同学给予指出。  ABSTRACT Completed the design of the main AT89S51 Microcontroller based data acquisition system hardware design and the corresponding software design. The hardware design of the system include: multi-switch and preamplifier circuit design, sample and hold circuit, ADC circuit design, digital to analog conversion circuit. Multi-switch and preamplifier circuit design highlights the choice of multi-way switch, AD521, and the calculation of the magnification CD4051 MUX hardware connection circuit and amplifier AD521. Sample and hold circuit design focuses on the principles of sample and hold circuit and the main parameters and sample and hold circuit for the selection and connection. Analog-digital conversion circuits focused on the design of the system A / D channel selection and A / D converter of the error analysis and A / D converter AD574 introduction, input and connection circuits. Digital-analog conversion circuit design highlights the D / A channel selection, D / A converter selection and D / A converter DAC0832 introduction, connecting the output circuit and the DAC0832. It also describes the hardware design, the choice of microcontroller, microcontroller AT89S51 the clock circuit and reset circuit. The software design includes the choice of compiler, various parts of the flow chart and program design. This design also analyzed the system performance and errors. The design is basically realized the design of multi