The pins are 5V tolerant, but the device still has to be powered at 3.3V.
The schematic at the URL posted has the nRF24l01+ powered at 5VDC. Those devices require 3.3VDC for power. The pins are 5V tolerant, but the device still has to be powered at 3.3V.If you are not seeing anything on the LCD, try copying the displayMessage( cacheMessage, copyrightMessage );statement, and put it right after the lcd.noAutoscroll(); line in setup(). You should at least see the copyrightMessage on the LCD. If not, double check your wiring. You might try it without the nRF24l01+ in place.I tried to Place the Copyright Message after the lcd.noAutoscroll(); and this works fine. I can see the message in the display.So I think the wiring is okay. I tried it with and without the nRF24l01 in place but that makes no difference... Hmm??Could it be a problem with the Interaktion between the arduino pro Mini and the nRF24l01?-transfinite