基于555定时器的湿度检测电路的设计与Multisim仿真  

Design and Multisim simulation of a humidity detection circuit based on 555 timer

作　　者：曹莉凌[1] 刘雨青[1] 杨琛[1] 吴燕翔[1] 

机构地区：[1]上海海洋大学工程学院,上海201306

出　　处：《电子设计工程》2015年第12期159-162,共4页Electronic Design Engineering

基　　金：2013年上海高校实验技术队伍建设项目(B1-5407-13-0000-8)

摘　　要：基于Multisim仿真软件,利用555定时器设计了湿度检测电路,用于电子技术实践教学。系统设计:1)利用HM1500湿度传感器采集湿度信息,转换为电压信号;2)利用555定时器设计压频转换电路,间接实现模/数转换;3)利用74LS161、74LS273等设计计数器测量锁存湿度值;4)利用数码管显示湿度值。Multisim软件仿真结果显示,本文设计电路准确稳定,转换精度高,线性度高,且成本低。该系统设计融合了模拟电子技术及数字电子技术课程基本教学内容,可作为实践项目用于教学。A humidity detection circuit has been designed for electronic technology practice teaching based on Multisim software. The design is as follow：1） convert humidity value to voltage value by using sensor HM1500;2） convert analog signal to digital signal indirectly by adopting voltage-frequency-conversion circuit based on 555 timer;3） measure and save humidity value by designing a counter based on 74LS161 and 74LS273;4） display humidity value by adopting digital number display. Simulation results based on multisim soft show that the circuit designed is of its correctness , stability, high precision of transformation , high linearity and low cost. The proposed design, which employs the basic teaching knowledge of analog and digital electronic technology, is suitable as a practice teaching project.

关 键 词：555定时器 湿度检测 Multium仿真 

分 类 号：TN710[电子电信—电路与系统]