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I have a fan, a light and two sonoff basic devices to control them. As sonoff can only work with internet, I thought it would be a good idea to be able to fully override the controls with separate switch just in case.

Diagram for connecting sonoff Basically, I want to use three separate switch.

  • if only S2 is on, the state of the devices will depend on sonoff
  • if S1 is on the light is always on
  • if S3 is on the fan is always on
  • if all three switches are off the devices are always off

I am aware that the button on sonoff can be used to override. However, I will be concealing the devices as they look a bit ugly while exposed.

I want to know if this setup is safe and will work without burning anything up.

  • Related: Questions about Sonoff switches come up fairly regularly on IOT (Internet Of Things) Stack Exchange. Also, depending on where you are in the world, Sonoff may or may not be “listed” or approved for use. – Tyson Jul 3 '18 at 12:17
  • "override the controls with separate switch just in case" Just in case of what ? – Alaska Man Jun 10 at 15:58
  • "sonoff can only work with internet" -- Just in case the internet goes down. – Steve Jun 10 at 16:23
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I would hesitate to give a definitive answer to this because it's obvious in your circuit that when S1 is ON and S2 is OFF then you are connecting mains to the output of Sonoff 1 with no connection to it's input.

However, I have checked my own Sonoff (Basic R2) and the input line is switched to the output by a mechanical relay with no other connection to the output so I can see no reason why this wouldn't be perfectly safe. Worth checking yours is the same though as other versions may be different.

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