DIN-Rail Supercap Blackout Guard & Isolated CAN-FD Node

The Mechanics:

A snap-on UEXT/GPIO industrial power supervisor combining two 15F series supercapacitors, an active ideal-diode PoE/24V OR-ing controller, and galvanic 2.5kV CAN-FD isolation on a single 4-layer ENIG PCB. When main plant power drops, an analog comparator triggers an immediate Linux shutdown GPIO interrupt while holding the 5V rail steady for 18 full seconds—enough to flush journaled writes cleanly to eMMC. Crash-Test Unit Economics: Built exclusively from standard stocked passives and automotive-grade isolators with zero proprietary silicon lock-in, keeping full KiCad schematics open while capturing recurring B2B fleet orders.

Utilitarian Value:

Crash-Test Spec: Solves SD-card and eMMC corruption on unattended factory-floor OLinuXino deployments without expensive external UPS boxes, creating an instant drop-in industrial shield with clean European fab margins.

Target Ecosystem:

Factory automation integrators, open-source PLC builders, off-grid telemetry engineers, and European embedded labs.