This is great, and seems to work for me. I assume you'd be able to change the code so that it could record total rainfall at a higher resolution? For example total for 15 minutes (or even more frequent!), as well as hourly and daily? Would this be an easy thing to add to the code?
Sorry, what I meant was can I use a Uno instead of the setup you have with the mini, as I already have 2 Uno boards to hand. Saves me buying a mini.
Absolute beginner here, but am I able to use a second Arduino Uno and NRF24L01+, i.e. same setup as the gateway, to connect up the sensor, instead of building one up with the Arduino Mini? Thanks