Best posts made by marlin

@gohan Thanks! You were correct. I also had one of those "adapters" lying around which I did not need for my Arduino nodes with MySensors, though it came into use for the Rp3.

@keldandorin Yes. See the response by @gohan. I used a "adapter" with a voltage regulator on it etc. Though, at the moment I don't recall the model number.