@ensbusiness said in SoCal help completing a MySensor system: Then I try adding a wireless sensor using the libraries from MySensor for the Atmega328P Pro-mini's and nRF2401's I already decided to use even before I found MySensors. The problem is that I can't seem to get the Pro-mini/nRF2401 combinations to send any usable data at all, either between two test units, let alone back to a Pi I think you are missing the point... you won't be sending messages peer-to-peer with my sensors. Rather, each sensor communicates through the gateway. @ensbusiness said in SoCal help completing a MySensor system: Adding a sensor to the Pi is what I already have up and running. I don't need or use a Controller for that. Again, focus on the radio bits first and forget about your Pi connected sensor for now. Read the docs... and wire up the gateway and a sensor exactly like the docs explain for the Pi gateway. Then, post some photos of your rig and the exact code you are using.