Modify the Sonoff Basic to work with the existing light switch

This was a very simple modification to make a Sonoff WiFi switch, work with the light switch on the wall. You can buy a more expensive light switch that has this functionality built-in and they can be more or less a straight replacement. But but since I had a few Sonoff's (and their clone copy's) already it was worth giving it a try. And as a bonus they are very cheap!

Please remember this involves working mains house wiring , so remember to turn off the the electrical supply

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