Sonoff Extension Cord

thingiverse

Here is an enclosure to make a wifi-switched extension cord with a sonoff basic module. The standard case leaves much to be desired when it comes to securing the wires, so I built this one. It has tapered clamps that wrap around the wire sheathing and clamp down tight once they are locked in place. I also applied hot glue on the inside of the clamps to seal out moisture, though I recommend keeping this in a mostly dry area, such as a covered porch. The clamps are sized for 16 AWG 3-wire extension cord that's 8mm in outside diameter. If you want to use a different size wire, you'll need to adjust the files accordingly. It should be pretty easy to do for any normal-sized cord. The files can be found on Onshape at the link below. Everything fits tightly, so be careful not to strip anything. I broke the button on my sonoff while installing everything. As for the button, it's inaccessible in the case. I wanted it to be as weather-proof as possible, so I didn't include a cutout to access it. The clamps require a good deal of force to get in place. I had to use pliers to squeeze them into position. But once they're there, the hold very well. https://cad.onshape.com/documents/bb3fbe9b198d11d65b1af485/w/d265ae4eceb3c488262b1236/e/feb71db265109c818a37f34d