基于单片机的多功能参数检测系统设计与实现：硬件电路设计与软件开发详解

"Based on Single Chip Microcomputer, the design and implementation of a multifunctional parameter detection system is described in this document. The system uses Single Chip STC89C52 as the main control chip, designed a current-voltage conversion circuit to convert the 4-20mA current signal corresponding to temperature, pressure, flow rate, liquid level and other physical quantities in the field into a 1-5V DC voltage signal, which is provided to the A/D conversion circuit. Due to the large number of analog quantities measured by the system, ADC0809 is used as the A/D conversion chip. LCD1602 is used as the display device, capable of real-time display of collected temperature, pressure, flow rate, liquid level and other physical quantities. Additionally, the system also includes circuits for parameter setting and alarm notification functions. The document is divided into three parts to introduce the design process of the multifunctional parameter detection system based on a single chip microcomputer. The first part mainly introduces the system's design scheme, clarifies the system's functional requirements, provides the system design diagram, and introduces the selection of some components and the development environment of software and hardware. The second part mainly describes the design process of the hardware circuit, including the introduction of main components and the design idea of the interface circuit with the single chip microcomputer. The third part introduces the design ideas of the software part, and describes the design processes of data acquisition, display, and key processing functions respectively. Keywords: Single chip microcomputer; current-voltage conversion; A/D conversion; LCD1602; audio and visual alarm."