I was just about to post a link, but figured I should UTFSE and poke around these boards before spamming a link that may have already been discussed thoroughly. Anyway, yeah this is such an interesting little project: https://pwnagotchi.ai/
I don't have any e-ink display or anything, was just trying to run it off my battery and bop around a bit, but have struggled to directly access the Pi Zero W from my mobile devices, via Bluetooth. Still working out the kinks, but awesome project, for sure. Can't wait to integrate it with the data i've been collecting for Wigle most of this calendar year... had been using an old tablet to harvest wardriving stats.
Here's a little previous of what i'm working with (how do i resize images?
Keep up the great work, gents!