三、研制过程开始我想用温度传感器加燃气阀来定时关掉燃气灶,但了解到天然气属危险品,不能用容易产生火花的零件。后来受张老师启发,我改用了一个定时装置,模拟电池没电,依靠天然气表自己关闭燃气阀,从而达到定时自动关火的目的。插卡式管道燃气表较贵,我选用电池盒、LED指示灯、电动阀来模拟燃气表。LED指示灯亮,表示 Third, the development process began I want to use the temperature sensor plus gas valve to turn off the gas stove regularly, but learned that natural gas is dangerous goods, can not be used to produce sparks parts. Inspired by the teacher Zhang later, I switched to a timing device to simulate the battery dead, rely on natural gas table to close the gas valve, so as to achieve the purpose of automatic timing off the fire. Plug-in pipeline gas meter more expensive, I use the battery box, LED lights, electric valve to simulate the gas meter. LED indicator light, said