"基于单片机的多功能参数检测系统设计与实现"

Based on the thesis "Design and Implementation of Multi-functional Parameter Detection System Based on Single Chip Microcomputer", this paper describes the design and implementation process of a multi-functional parameter detection system based on a single chip microcomputer. The system adopts the single chip microcontroller STC89C52 as the main control chip, designs current-voltage conversion circuits, which can 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 large number of analog measurements, the ADC0809 is used as the A/D conversion chip. The LCD1602 is used as the display device, which can real-time display the collected temperature, pressure, flow, and liquid level values. Additionally, the system also designs parameter setting and alarm prompting functions. The paper is divided into three parts to introduce the design process of the multi-functional parameter detection system based on a single chip microcontroller. The first part mainly introduces the system's design scheme, clarifies the system's functional requirements, provides the system architecture diagram, and introduces the selection of some components and the software and hardware development environment. The second part mainly introduces the design process of the hardware circuit, including introductions to the main devices and the design ideas of the interface circuits with the single chip microcontroller. The third part introduces the design ideas of the software part, and describes the design process of each functional part such as data acquisition, display, and key processing. Keywords: single chip microcontroller; current-voltage conversion; A/D conversion; LCD1602; audio-visual alarm