cool, what dimensions are you down to now?
btw. what happened to the trace in lower right corner (the one that runs by the ISP connector)?
Really nice design..
Could you please post the schematics / board files as well, as this is a openhardware site.
Also if you upload the gerber files directly (not in a zip / rar file), then the openhardware.io site is able to render 3D views of the boards etc.
Welcome aboard In theory you do not need a controller. You can manuallyt assign ID to individual nodes. And then make a translation of some sorts between modbus / mysensors protocol.
I don't know if anyone had made a router that can handle the translation between mysensors / modbus though, so you might need to make one from scratch yourself..
what is the "official" firmware that you upload to the atmega? If it's the sensebender micro fw, then please observe that this is meant to run with a Si7021 sensor, and not DHT22, so unless you modify things, it won't run without that sensor onboard..
I used this as a base for my own build: https://www.instructables.com/id/2-Player-Bartop-Arcade-Machine-Powered-by-Pi/