The Beer SAO

Measures and displays your beverage temperature. Cursed by design

What is included:

• 1x Beer cup SAO,~100x100mm, including waterproof temp sensor on ~200mm cable
• A surprise sticker, and maybe a cursed 3d print.

What does it do?

• It's a beer SAO, for your beer.
• Measures and displays temperature using the attached DS18B20 temperature sensor (~250mm cord)
• Brightness setting button, so it works in a variety of lighting conditions (button on rear)
• Triple 7-segment display implemented with discrete, shine-through LEDs and a 3d-printed shroud to block segment bleed-over.
• Power via SAO port or USB-C (doubles as programming port)
• Overkill by design: Controller is a RP2350 with 2MB flash.
• Non-power SAO pins routed to RP2350 in case you want to use them
• All design, manufacture, and firmware files are open-source: You can easily reprogram with whatever firmware you like, or return to the standard firmware.

Why I made this:

I am part of team Beverage Chilling Contraption Contest at DEF CON. The contest turns 21 this year, so we can properly drink now! We turn hot beers into cold beers, with physics. A constant problem I encounter for three days in August every year is "where the hell did I put that thermometer?" This solves that. It's on the badge now. Can't lose it.