一种基于NE555定时器的气敏报警器的设计

摘要

Using NE555 timer and MQ-2 a gas sensor designed a combustible gas monitoring alarm. A timer NE555 mainly plays a role of time delay , a control signal processing and NE555 timer. Combustible gas concentration of different turn gets sensor signals in different sizes , thus control alarm and exhaust system work. Alarm test shows that it can be used in a variety of combustible gas of different working environment, has simple circuit, reliable operation, easy to use adjustment, etc.%利用NE555定时器和MQ-2A气敏传感器设计了一种可燃性气体监测报警器.一个NE555定时器主要起延时作用,一个NE555定时器起信号处理和控制作用.可燃气体的浓度不同将使气敏传感器转化的电信号大小不同,从而控制报警及排风系统工作.试验表明,该报警器可用于多种可燃气体的不同环境工作,具有电路简单,工作可靠,便于使用调节等特点.