文档介绍：毕业设计说明书
题目: 便携式可燃气体检测仪
院(系): 电子工程与自动化学院
专业: 智能科学与技术
题目类型: 理论研究实验研究工程设计工程技术研究软件开发
摘要
本设计利用三个MQ-X系列可燃气体传感器,分别为检测一氧化碳的MQ-7,检测甲烷的MQ-9,和检测乙炔的2M004,再使用这些传感器之前先预热十分钟左右,预热完之后将这些传感器放置于待测的环境中,这些传感器可以根据可燃气体的浓度分别转换为电压,然后再将转换得的电压经过TLC549进行模数转换最后送入AT89S52单片机处理。为了方便用户对可燃气体浓度的实时了解,在AT89S52单片机外围链接了用于显示的LCD1602液晶显示屏,把经过单片机处理过的浓度值显示在液晶屏上,以防止事故的发生;为了更好的设置可燃气体的报警浓度,还在单片机周围链接了按键以便于设置报警浓度,当所测得的浓度超过设置的浓度时,单片机控制发光二极管和蜂鸣器发光发声;通过串口把实时采集到的浓度传给上位机,并在上位机上显示出来,从而实现在上位机上的监测。
本次设计便携式可燃气体检测仪所用的AT89S52单片机价格便宜,性能稳定。以MQ-X系列的可燃气体传感器和以AT89S52单片机为核心设计的可燃气体检测仪,设计方法简单易行,使用效果良好。下面给出了便携式可燃气体监测仪的总体设计原理,硬件电路和所有的软件设计。
关键词: 气体传感器,AT89S52单片机,上位机,模数转换
Abstract
This design USES three MQ - X series bustible gas sensor, respectively for the detection of carbon monoxide MQ - 7, mq-9 to detect methane, and detection of acetylene 2 m004, then use these sensors to preheat before ten minutes or so, preheating after placing the sensors in the test environment, these sensors can be according to the concentration bustible gas is converted to a voltage respectively, and then will be converted to voltage after eight bits, modulus conversion finally into the single chip puter AT89S52. For the convenience of users of real-time understanding of bustible gas concentration, the AT89S52 microcontroller peripheral link is used to display LCD1602 LCD display screen, the treated by single chip puter was displayed in the LCD screen, in order to prevent the happening of the accident; In order to set the concentration bustible gas alarm, also around the microcontroller link the button to set the alarm concentration, when measured by the concentration of more than one set of concentration, single-chip puter control light-emitting light-emitting diodes (leds) and a buzzer sound; Via a serial port to the PC, the concentration of real-time collected and displayed in the upper unit, so as to realize the upper machine monitoring.
The design of a bustible gas detector using AT89S52 microcontroller is cheap, stable performance. MQ