A 1284p based variation of our classroom logger which normally uses the 328 based Pro Mini.  I've repurposed an RPi expansion board to accommodate the Moteino MEGAs' larger footprint. Our 'modules & jumper wires' approach makes this kind of build variation quite easy to do:

 

https://thecavepearlproject.org/2020/05/11/build-an-atmega-1284p-based-data-logger/