2018-07-13 Update: Install an alarm in your room
The materials are simple: one battery case (mine is with a switch), 1 LED, 1 photoresistorThe LED is connected in series with the photoresistor (the longer the wire, the better will be, you will know why later). I connect them together for the convenience of demonstration.Place it on the door with the battery case (PS: The photoresistor must be placed in a place where will be dark when the door is closed, be bright when the door is opened, otherwise it will have no effect)I put it on the door li...
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