Grounding...

[moskovskiy82]

I am currently planning on switching from WiFi MQTT to serial gateway and will be using arduino nano connected to raspberry3
So arduino will receive it's power from the USB port.
Than there will be an NRF24PA version so planning on powering it from a separate 5V source converted via 1117 to 3,3V
My question is on the ground. The ground pin from NRF24 should be connected to the power supply and in parallel to the GND pin of arduino?

[jbjalling]

Yes. The two power supplies need a common reference, so the grounds need to be connected.

BR Jonas