Relay latches at startup #1
Description
The output relay switches itself at startup - this is related to the way that Pin D3 on the WeMos is mapped as a special pin on the ESP8266 which determines where it should boot from. There's a brief moment when it's pulled high, and a pull down can't be used because it will interrupt boot.
The solution is to swap the status LED with the relay, as status is occupying a normal pin. Fix permanently with Revision 2.