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Description
当环境空气是正常状态时，气敏元件qm-2相应的电阻值，以及电路图中的R3的电阻，可变电阻RW的电压使555芯片的3脚输出高电平，报警电路断开，不会触发报警。但是当MQ-2传感器检测到环境中存在一定浓度的有害气体、液化石油气、汽油、酒精、烟雾等有毒气体时，其电阻会减小，配合电阻R3，RW分压的作用，使555芯片复位，3脚输出低电平，驱动报警电路使继电器动作，同时发出声光报警信号。
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