本智能排气扇以STC12C5A08S2为核心控制单元，通过远红外传感器探测热水器加热火焰来判定热水的开停。采用抗干扰能力强，精度高的数字温度传感器DS18b20感知温度，结合晶闸管BT136，实现无级调速。系统通过1602液晶把温度、湿度，转速等实时信息反馈给使用者。使用者也可通过键盘实现排气扇的本地控制。本设计通过霍尔传感器进行转速的采集，进而实现排气扇卡死等故障的自我检测。-The smart exhaust fan to STC12C5A08S2 as the core control unit to determine the hot water turns on and off through the far-infrared sensor to detect water heater heating flame. Strong anti-jamming capability, high accuracy digital temperature sensor DS18b20 sense temperature, combined thyristor BT136, stepless speed. System through 1602 LCD real-time information such as temperature, humidity, speed feedback to the user. The users can also be achieved through the keyboard of the local control of the exhaust fan. The design by the Hall sensor speed of acquisition, thus achieving exhaust fan stuck failure detection.