摘要
介绍了基于AT89S52的电容式物位限位计的基本组成与原理,给出了基本硬件框图与关键软件流程图。由于空间电容值随物料高度的不同而改变,利用波形发生电路将物料高度转化为相应的高频信号,便于单片机进行测量并有效地提高抗干扰能力。系统扩展了多种输出接口,以满足不同场合的需求。此限位计具有结构简单、功能丰富,实用性强,性能稳定,便于安装使用等特点,能工作在较恶劣的环境中并可实现远程监控。目前,已用于粮食、水泥、水位等监测系统中,并取得了良好的评价。
Introduces the basic constitutes and theory of the capacitve material＇s position ristriction instrument based on AT89S52 and gives the basic hardware diagram and the key software flow chart. As the capacitance of space is changed by the height of material, we converted it into high frequency through wave generate circuit in order to measure it by MCU and improve the anti-jammlng ability of system. Also expanded multiple output interface for requirements of different occasions. This instrument has characters of simple structure, abundant functions, powerful application, stable quality and convenient installation and use etc. It can work in much bad environments and implement remote supervisor and control. It has been used in many detection systems such as foodstuff, cement, water level and gained good reputation.
出处
《仪表技术与传感器》
CSCD
北大核心
2006年第2期11-12,共2页
Instrument Technique and Sensor
关键词
频率
微控制器
4—20mA电流环
电容传感器
frequency
micro control unit（MCU）
4 - 20 mA current loop
capacity transducer
