Adafruit

The whole build starts with one stubborn constraint: the truck sits for days at a time, and when it sits, nothing is supposed to be awake. This is a computer for a 1969 Chevy Blazer (and a second truck, a Dodge). It sleeps until my phone comes near, wakes, boots, and talks. Offline-first, low power, always-on sentry that draws almost nothing and a real computer that stays dark until it is needed.