This circuit shows how to use an ordinary LED as a light sensor. It makes use of the photovoltaic voltage developed across the LED when it is exposed to light. LEDs are cheaper than photodiodes and ...

我们知道，一个动圈式的电磁扬声器，既可以播放声音，也可以作为麦克风来检测声音。同样，一个直流电机可以将电能转换成动能，也可以将动能转换成电能。那么一个LED是否也可以将光转化成电信号，进而可以当做光电传感器呢？ 为什么提出这个问题？

IKEA is everywhere right now, especially after rolling out a huge lineup of 21 Matter-compatible gadgets at the start of last ...

Whether you’re looking for added security at home or easier navigation at night, motion-sensor lights can provide a boost of visibility whenever you need it. The best outdoor motion-sensor lights have ...

Need a cheap and easy way to deter intruders? For homeowners, outdoor lighting is a game changer for providing a line of sight on potential trepassers without running up costly energy bills. If you're ...

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