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Light-Operated Doorbell

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Publish timeļ¼š10-26-2020
Light-related switches are used in toilet automatic hand dryers and washers.This is a simple light-controlled switch that also works in normal light.You can paste it on the front door of your house and use it as an automatic doorbell or thief alarm.As soon as someone's shadow falls on the device's sensor, the bell rings.
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Circuit Everyday
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