定量称重控制仪的设计

定量称重控制仪的设计(41页)Good is good, but better carries it.精益求精，善益求善。定量称重控制仪的设计摘要我国的定量称重仪表衡器需求量很大，但定量称重控制仪表技术却相对落后。为此，设计了一种自动定量称重控制仪，该定量称重控制仪具有控制准确度高、功能有用以及性能稳定可靠等特点。本控制仪属于单片机嵌入式系统，采纳 AT89S52 作为系统的 MCU 单元。所设计的硬件电路单元主要包括：信号调理电路、数据采集电路、显示和键盘电路、系统输出电路、系统电源电路等。选用了灵敏度高、性能稳定的电阻应变式称重传感器及高分辨率模数转换处理芯片 AD7810，保证了系统的测量精度和准确度。通过编制系统的软件程序，实现了三级给料定量称重过程的自动控制、提前量数据的自行修正、包装数据的自动保存以及键盘操作和实时显示等多项有用功能。从而使本定量称重控制仪的稳定性、及定量称重控制的准确度均达到预期的要求。关键词 定量称重；单片机；自动控制The Design of Quantitative Weigh Control InstrumentAbstractThe demand for automatic quantitative weighing apparatus in our country is quite large , but the automatic quantitative weighing control instrument technology of our country is still relatively behind the times .So a quantitative weighing control instrument is developed in this dissertation ,and it has the characteristics of high control accuracy ,practical functions and stable and reliable performance etc. This instrument can be classified into embedded microcontroller system, and the microcontroller unit employed in this system is AT89S52.The hardware circuits designed include: data acquisition circuit , display and keyboard circuit , output circuit ,system power supply etc .To ensure the precision and accuracy of the system ,the resistance strain meter type load cell that is of high sensitivity and stable performance and high resolution analog-digital converting chip AD7810 are selected .By programming the software of the system ,several practical functions ,such...