3-phase power consumption measurement

[Paul-Reed]

@tve

OK, so now if that circuit works, you can get rid of the level shifter...

Thanks @tve pulling the protocol line low has made this much easier to accommodate the two different voltages.
I've attached a new circuit diagram below.
Both the PZEM and the ESP32 must now share the same common ground connection, otherwise the PZEM will not be able to pull the ESP RX low.