Click counter Q5

Count Fidget

A lightweight, rechargeable two-key fidget that counts clicks, resets with a second key, and remembers its count while asleep or unpowered. Designed for a home-printed enclosure and professionally assembled electronics.

Q5 is the active engineering candidate: the Q4 STM32L072CBT6 / USB-C home programming / SPI OLED / SPI FRAM design, plus:

• a soft power key (COUNT turns it on; it switches itself off after 30 s, drawing ~8 µA);
• a vendor-soldered LIR2032 coin-cell holder in place of a custom battery pack;
• a battery gauge with LO warning and storage cut-off, and charge status;
• a reset pinhole;
• hold-to-reset key logic;
• a smaller 47.2 × 59.2 × 16.8 mm printed enclosure with printed keycaps;
• solder-free keys (clicky switches pressed into vendor-placed hot-swap sockets).

JLC performs all SMT from standard inventory parts. Two JLCPCB variants are prepared:

• A: the user solders the display header (14 joints);
• B: JLC also fits the display.

Q1–Q4 remain historical, unchanged packages.

The design is locked. JLCPCB quoting only is authorized (see JLC-QUOTE-Q5): no order, payment or manufacture. The design files, firmware, emulation and CAD checks pass. Nothing has been built or measured. The first units follow the first-article test plan.

Start with the Q5 engineering review, PROJECT.md for status, and HANDOFF.md for continuation.

Quick checks, with Python 3 and a C compiler:

python3 scripts/verify_project.py
python3 scripts/run_host_tests.py

These verify files, package consistency and portable firmware logic, not physical electronics. Toolchains, credentials, private mailbox content and customer account sessions are not stored in this public repository.