Power. All the power. Relays, buck converters, WiFi power plugs

They're probably Ada's, to be honest.

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I've just ordered three circuit boards for the initial prototype for testing/sizing, for what it's worth. $12.14 for three with tax and shipping. I'd call that a deal.

54%20PM

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Shouldn't the diode in the circuit diagram pointing in the other direction?

No, it's correct the way it is. When the relay is switched off, the coil inside creates a current that is opposite the former current, so the voltage is also is reverse. To protect the semiconductors (here the transistor), this voltage is shortened by the diode.

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Saved by the diode. (yay)

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