The Digital Die resembles a pocket calculator, but all of its functions were designed specifically for games like Dungeons & Dragons. The user can perform simple functions, like rolling a d20 or a d100. But, they can also roll more elaborate sets of dice, along with modifiers, like “4d20 + d4 + 4.” Anyone you’re playing with be naturally suspicious of the device, so there is a test function to prove that it’s a fair die. There is also a “gambler’s fallacy mode” that forces a roll distribution that feels more like what our statistically-impaired human minds expect.
The whole thing is controlled by an Adafruit Feather M0 Express, and the results of the die rolls are shown on a 2.3″ 128×32 OLED screen. The buttons are knockoff Cherry MX keyswitches, like what you’d find in a decent mechanical keyboard. A 2200mAh lithium-ion battery powers it all, and everything is fitted into a thin 3D-printed enclosure. If you want to build your own Digital Die for your next gaming session, Everett has provided his code and STL files for printing your own case.