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Controling switch-buton by using arduino?

Hi

im using a switch-button on blynk dashboard to control a relay for 30min

how can i realize that the switch-button falls back after 30min? (when the relay is low again)

By using the button’s On status to trigger a timeout timer that runs for 30 minutes, then writes an Off value to the widget’s virtual pin.

You might want to read these…

Pete.

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You can also try the automation which is the easiest way, you can use the automation to make something like this

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