I know I am keeping on insisting on something you already explained to me, but I need to ask. Can I use a primary, smaller media for the OS and a bigger external storage for data logging, if that is the primary use of space? If so, how many space would be needed for the OS install alone?
Also, would I be wrong in assuming the great majority of writing cycles happen for logs, while the underlying system remains mostly untouched? Because in that case I could use an SD for the OS, and an SSD to keep elaborated data.
Lastly, if I am to use the RPi3 I already have lying around, I won’t have USB3.0 available. Will the USB2.0 ports I have be too slow? Do I have to upgrade my system for that reason alone?
Would you be kind and further expand on the make/models? I am searching for a cheap (wifi/Zigbee/Z-Wave) elusive wall switches that work directly with HA. Did I mention cheap? I also cannot have even initial setup connecting to the internet as I have no internet (or cell) in this location.
I like WiFi- it just works. I recently bought some Kuled switches because they come pre-flashed with Tasmota. (I don’t use Tasmota much and the first thing I do is to put ESPHome on it).
I don’t think you will find a WiFi switch that does dimming or color changes. For that you need Z-Wave or Zigbee, but those devices cost at least double the price of WiFi.
If you need three-way switching, Z-wave switches will do it. I don’t know about Zigbee. (FWIW, in three years I have had two z-wave switches die- but my WiFi switches just keep working).