Electronics > Projects, Designs, and Technical Stuff
ESP8266 with relays
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Gabriel:
Ok so taking all that you guys have said into consideration I present version 4!
Nusa:
Clearance is needed on both NO and NC pins. They're both in contact with mains.

I'd suggest swapping the pins the mains traces go to. Then they don't have to cross. And if they don't cross, you can put them on the same side of the board.
Twoflower:
I know your design is supposed to very dense. But I would try to remove any devices and the ground-plane below the antennae to improve the RF performance. Probably also move the ESP antennae closer to the edge.

Also the power connector there won't help to increase the WLAN performance.

Maybe even remove the planes below the relay. Yes you might have the minimum required clearance, but if you can increase the clearance: Do it!

Check the thermal limits of the regulator. Assuming 100mA consumption (WLAN active, but it could be even 170mA): (12V - 3.3V) * 100mA = 870mW. Probably you need a heat-sink for that one.
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