I have two NRF24L01-connected nano clones, Alice and Bob. Both are connected to their NRF24L01s using pins 9-13, 3.3V, and GND. Alice has an LED connected to pin 3.
When Alice is connected to USB, her NRF24L01+ is transmitting and receiving properly; Alice's LED blinks on and off in accordance with a signal from Bob.
However, Alice's LED fails to react to Bob's signal when Alice is disconnected from USB and connected to 12V through the Vin pin.
Troubleshooting I've already done:
The Blink sketch (modified to use Alice's pin 3) runs OK when Alice is connected to 12V. So the LED is good, and Alice is getting power.
If Bob's transmission software is loaded onto a 12V-connected Alice, The new AliceBob can communicate with other Alices that are connected to USB. So AliceBob's NRF24L01+ appears to be working OK under 12V, at least as far as transmitting is concerned.
A 12V-connected Uno with an NRF24L01+ and Alice's software has no problem receiving and reacting to Bob's signal.
Following instructions from this tutorial thread I have some 10 pF capacitors on the way but they won't arrive for a few days.
Any advice or ideas while I wait for my capacitors to arrive? Thanks in advance.