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LoLin / NodeMCU v3
So, what’s with the V3? NodeMCU haven’t released a new specification so far. Hence, there’s no official 3rd generation board. Turns out that V3 is a “version” invented by producer LoLin to signify minor improvements to the V2 boards. Among others they claim their USB port to be more robust.
If you you compare the pin layout there’s only a tiny difference to the V2 layout. LoLin decided to use one of the two reserve pins for USB power out and the other for an additional GND.