This PCB is an easy way to connect the SMD RFM to the Wemos D1.
The data lines are connected from the Wemos to the RFM.
All three RFM grounds are interconnected to the ground plane.
Regulate the voltage to 3.3v for the HopeRF RFM92/95 module.
The HopeRF RFM92/95 only works on 3.3 volt.
Higher voltage will damage your LoRa module!!