Review date: 2026-09-01
Scope: Read-only review of the current schematic and PCB. No fixes were applied.
Evidence policy: PASS means confirmed from live project data and, where required, immutable datasheet evidence. FAIL means live project data demonstrates a functional or manufacturing defect. UNVERIFIED means the required external evidence or physical mapping was unavailable. Datasheet indexing returned “immutable evidence not ready” for the TPIC6B595 and SN74AHCT125 queries, so claims requiring datasheet clauses are not promoted to PASS.

Overall: FAIL. The schematic signal topology is coherent, but the board has active PCB errors and the 12 V-to-5 V linear-regulator architecture has a severe thermal ri...

The Days Since Counter is a large, network-capable two-digit counter intended to show the number of days since a selected event. Typical uses include “days since the last incident,” “days since a milestone,” or any other value that can be represented from 00 to 99.

The Raspberry Pi Pico 2 W provides the intelligence and wireless connectivity. Firmware determines the value to display—either by calculating elapsed days from a stored date or by receiving an updated value over Wi-Fi—and converts the two decimal digits into seven-segment patterns.

The board is designed as a self-contained sign: