I have troubles getting the NRF24L01's working with the Arduino Pro Mini's. I red sites and forums about this subject, but none gave me an answer.
Consider a simple program for bidirectional communication. I've tried the following tests and these are my findings;
1. NRF modules with Arduino Uno's: bidirectional communication works perfect! 2. NRF modules with 1xUno and 1xProMini: communication works from Uno to Mini but not in the other direction (no data transmission from Mini to Uno). 3. NRF modules with Pro Mini's: no response.
I assume there is something about these Pro Mini's that just doesn't get the job done. On this forum, there are more people with the same problem. It's striking that these problems occure when people are trying to communicate with different µC's (e.g. Uno/nano/pro mini/RPi/...)