pecahan

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shards

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在本设计中探测学生采用的是人体感应模块HC-SR501。其LHI778 探头是德国原装进口，灵敏度高，工作模式时电压消耗低。当学生进入教室感应范围时，人体自身发射的红外线通过菲涅尔滤光片增强后聚集到热释电元件上，电荷失去平衡状态，开关持续导通输出高电平，学生离开教室感应区域自动延时关闭负载输出低电平，可以做到人在灯亮，人走灯灭 ...

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fraction<br>

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