Uno to Pro Micro with nRF24L01

[markd833]

I would suggest you start here:

Simple nRF24L01+ 2.4GHz transceiver demo

Introduction The nRF24L01+ 2.4GHz transceiver modules are cheap and very effective but I have come across a few Threads in which people were having trouble with them so I thought it might be useful to gather together in one place a basic step-by-step sequence for getting them to work. EDIT 03 Feb 2021 - For this Tutorial install Version 1.1.7 of the RF24 library (available with the Arduino Library Manager). More information in Reply #30. Edit 29 Aug 2016. I have today downloaded and successfu…

Start with post #1 to get the wiring right. Then jump to post #30 and run the CheckConnection.ino sketch to check for successful communications between your micro and the radio module. Post the output of the sketch here if you are unsure. Then go back to post #2 and run the simple Tx & Rx sketches.

The code has been proven to work for 100's of users.

You should also make sure that your 3.3V supply is up to the job. The 3.3V output on the UNO and Pro Micro will struggle. Try a couple of AA batteries as your power source for the modules instead.