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总线式智能流量计的设计

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摘    要 [资料来源:http://www.THINK58.com]

 

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该设计以51系列单片机AT89S52为控制核心,实现流量测量的基本控制功能。在设计系统时,为了更好地采用模块化设计法,分步的设计各个单元功能模块,系统的硬件部分可以分为最小系统、数据采集、人机交互界面和系统电源四大部分。最小系统部分主要包括AT89S52和扩展的外部数据存储器;数据采集部分由流量传感器、信号的前级处理和A/D转换部分组成,包括运算放大器AD620和A/D转换器;人机交互界面为键盘输入和点阵式液晶显示,主要使用ZLG7289键盘控制芯片和OCM4x8C显示器,可以方便的输入数据和直观的显示中文。系统电源以LM317和LM337为核心设计电路以提供系统正常工作电源。软件部分应用单片机C语言进行编程,实现了该设计的全部控制功能。该流量测量可以实现基本的功能。

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关键词:单片机;采样电路;A/D转换器;液晶显示

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ABSTRACT [资料来源:THINK58.com]

 

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The design is based on the microcontroller AT89S52 system as the core to carry out the basic control function of the electronics steelyard. While designing the system, I adopt the mold piece method to divide the hardware of the system into four parts: the minimum system, sampling circuit, I/O interface and the system power supply. The minimum system mainly includes the AT89S52 and the expanded exterior data memory. Sampling circuit is comprised of a pressure sensor, a differential measuring amplifier AD620 and a A/D converter . With the usage of ZLG7289 keyboard control chip and OCM4*8C display, we complete the function of the key board input and the LCD manifestation. The power supply system selects the LM317 and LM337 to design the electric circuit to provide the needed power supply. The software part applies a machine C language to carry out all control function.

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Key words microcontroller;  sampling circuit;  A/D converter; [来源:http://www.think58.com]

LCD Manifestation [资料来源:www.THINK58.com]

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