hey there!
(admins please shift this if it’s in the wrong place!)
I’m heading into the world of home automation! Treat me gently 
My current plan is to use hass.io as my install on to a raspberry-pi 3 model-b with the builtin wifi - as i have a spare lying around from a previous project.
But would someone be able to tell me how to disable the onboard wifi chip when using hass.io so i can use a wifi dongle instead?
I ask, as previously i’ve had issues with the onboard wifi chip crashing when trying to connect via samsung phones. I found this when getting Octoprint running.
The problem seems to be getting narrowed down and can be seen here:
https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=196018
https://github.com/raspberrypi/linux/issues/1342
I would usually fix it with creating/modifying this file:
/etc/modprobe.d/raspi-blacklist.conf
and adding these lines:
blacklist brcmfmac
blacklist brcmutil
but alas it seems hass.io recreates that file each time it restarts and therefore is blank 
or is that not needed at all and my assumptions are terrible?
thanks!
Jerry_nz