I use radio (nrf24l01) instead of wifi for talking between the arduinos and the centralized rpi, to save power and for convenience. I also use the standard atme

I use radio (nrf24l01) instead of wifi for talking between the arduinos and the centralized rpi, to save power and for convenience. I also use the standard atmega328 microcontroller chip. Atmega runs on a coin cell for well over 8 months.