"基于单片机的多功能参数检测系统设计与实现"

Abstract This paper discusses the design and implementation process of a multi-functional parameter detection system based on a single-chip microcomputer. The system utilizes the STC89C52 single-chip microcomputer as the main control chip, and a current-voltage conversion circuit is designed to convert the 4-20mA current signals corresponding to physical quantities such as temperature, pressure, flow, and liquid level in the field into 1-5V DC voltage signals, and provides them to the A/D conversion circuit. Due to the system's need to measure multiple analog quantities, the ADC0809 is used as the A/D conversion chip. The system uses the LCD1602 as the display device, which can real-time display the collected temperature, pressure, flow, and liquid level. In addition, the system also designs parameter setting and alarm function circuits. The paper is divided into three parts to introduce the design process of the multi-functional parameter detection system based on a single-chip microcomputer. The first part mainly introduces the system's scheme design, clarifies the system's functional requirements, provides a system schematic diagram, and introduces the selection of some components and the development environment of software and hardware. The second part mainly introduces the design process of the hardware circuit, including the introduction of the main components and the description of the design ideas for the interface circuit with the single-chip microcomputer. The third part introduces the design ideas for the software part, and describes the design process of various functional parts such as data acquisition, display, and key processing. Keywords: single-chip microcomputer; current-voltage conversion; A/D conversion; LCD1602; audio-visual alarm.