I have connected two nRF24L01, the master on a Nano and the slave on UNO R3. I used Robin2 sample https://forum.arduino.cc/index.php?topic=421081 to be as standard as possible.
Through serial.prints I see the master side sends the message but does not receive confirmation. The slave side starts the loop but does not get "signal" (radio.available). Am I wrong to suppose that the problem originates with the slave if the master gets to send the message?
I checked all the HW connections and the power at 3.3V on both circuits. The UNO (slave) has wires soldered nRF24L01 side but (a little loosely as usual) plugged into the UNO contacts. I have not inserted the capacitor because I only have a 100µF not 10.
I am short on ideas on what to do next to verify why they do not work and get on with my project. Is there something I can get with an oscilloscope or ???