Most attempts at keeping a drunk person off their phone rely on willpower or an app that anyone can close. This build takes a different route: the phone only unlocks after passing a breath test on a separate device.
The hardware is tidy. A white angled enclosure holds a color display that walks the user through each step, and a microcontroller wired with jumper cables sits on the back. The circular alcohol vapor sensor is mounted on top. On the phone side, a homepage shortcut opens a full-screen web page, and the breathalyzer talks to that page to trigger unlocking.
The flow reads well: the screen prompts a blow to unlock, runs a short deep-breath countdown, then shows a sniffing message. Once alcohol is detected, the phone lands on a red-tinted lock screen stating it stays locked, with only food delivery and ride icons available while Messages is disabled, and a blocked message reporting that iMessage stays locked until sober. Above 0.08 logged, an iOS Shortcut named Drunk Food places a DoorDash order for a 20-piece McNuggets, large fries, a Big Mac and two Gatorades, sent to the home address.
One thing is still open: this is a web page demo, and while the locking functionality exists, it does not actually lock the phone yet. That gap is the piece I would watch.