Pantherinae wrote: ↑
Tue May 26, 2020 11:22 pm
yeah but I don't want them to communicate over wifi, I prefer Ethernet , as this is a mobile device that needs to operate independent of public wifi.
You don't need to use public WiFi to connect to a Pi.
WiFi would usually allow greater mobility than wired ethernet, so it's odd to see you wanting to use wired ethernet over WiFi.
You can connect the wired ethernet Pi to a home router then WiFi connect your Arduino to that same router, or set up the Pi as a WiFi Access Point and WiFi connect your Arduino direct to the Pi. No need to buy an Ethernet Shield.
Or you can use the Ethernet Shield with your Arduino and cable connect both to a router, or switch, or directly.
There will be some configuration needed no matter which you do but it should be minimal in all cases.