The principle of the AC power outage sensor is the same as that of the induction pen. It is a non-contact induction module. When using it, you can use a nylon tie to fix it on the cable line (preferably the live wire). When the cable line is powered, the module has a level output. , there is no level output after power off, the microcontroller can sample the level and process it. It can be used in communication base station control, street light control and other occasions. The power supply of the module is 5V, which is relatively safe because it is not in direct contact with the AC power supply.
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