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This is the scheme that I deduced from that: Toon 5 <-> WeMos G(nd) Toon 9 <-> WeMos 3.3V Toon 11 <-> WeMos TX Toon 13 <-> Wemos RX I also completely covered the WeMos module with tape to prevent false electrical contacts between the Toon and the WeMos ESP8266 when snugly installed in the case of T...