Nice Relay.
This is probably what the IOT uses.
Would be a safe bet as far as keeping the Arduino safe as its opto isolated.
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Thanks for posting this. I want to build something someday that looks like the X-Controller to control the dust collection and Dewalt.
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Just remember that you need to use the correct parts.
mains power is no joke It not only can kill but it can cause fires and do a lot of damage.
I did some research and posted my findings here: