What we have here is an M5Stack Fire developer kit based on the ESP32 SoC microcontroller. The app was programmed using UIFlow Scratch-like graphical programming environment. Here's a screenshot of the program that generated butext.py.
The app presents a slide show that advances to the next slide image each time the A button is pressed. Pressing the C button displays an "easter egg" image showing a kernel panic. Of course, everybody knows this thing isn't running Linux, so this was good for some laughs!
Updated July 2024: The easter egg function has been enhanced in celebration of CrowdStrike Global IT Outage Day. Check out the last photo below.
Pro tip: the png files were created with a transparent background by exporting from svg files in Inkscape. This significantly increased the rendering speed on the screen.
I used a hotel room key and a scrap of Lego block to attach the device to my conference badge. Here are some photos of the final project.
Enjoy with beverage of choice!