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docs: BUG-18 plan — DS3231 (I²C) + SIM868 CR1220 RTC backup

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Mathieu Moran
2026-08-13 16:13:51 -04:00
parent f94c50b2ee
commit c44026e511
2 changed files with 15 additions and 4 deletions
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PLAN.md
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@@ -2273,7 +2273,8 @@ logged as `BUG-XX` entries in [BUGS.md](./BUGS.md) (BUG-16 onward) and fixed + v
across reboots; also fixed a NULL-GPS speed-only row crash in the trip builder. Verified the
2026-08-13 drive now appears locally.
- **BUG-17 (trip timestamps wrong) — OPEN**: no RTC → clock drifts without internet.
- **BUG-18 (no RTC) — OPEN**: add a battery-backed RTC (DS3231) / GNSS time source.
- **BUG-18 (no RTC) — OPEN**: plan set — DS3231 RTC on I²C (desolder charging circuit, CR2032)
+ SIM868 CR1220 RTC backup; NTP online, RTC/GNSS fallback offline.
Open items from the drive — fill in as reported:
- BUG-17 / BUG-18 (clock) pending.