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Tex
V2EX member #207558, joined on 2016-12-25 21:08:23 +08:00
Tex
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Jan 18, 2017
Replied to a topic by
martyyyyy
›
奇思妙想
›
想远程检测厕所是否有人，求讨论
装个红外感应器，再在正前面装一个很小的镜子，如果有人的话红外线就会被挡住，然后红外感应器接收不到红外线就会发出信号，这样就知道了
»
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