Active High & Active Low Relay Module | Explained 

This video contains how the High active module works and how the low active module works,
As well as what Input should be applied to both,
in it I also discuss how pull-up resistors and pull-down resistors work to provide voltage input to the relay module,
Hope this video is useful :)
Read About Pull-up Resistors and Pull-Down Resistors : en.wikipedia.org/wiki/Pull-up...
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