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docs: add M9N GPS module plan

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nick
2026-06-15 09:59:21 -06:00
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docs/HARDWARE.md
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@@ -235,3 +235,7 @@ Important guardrails:
- Confirm relay polarity/state behavior.
- Confirm available GPIO for DS18B20 and any optional OLED/status hardware.
- Treat the LilyGO board as the controller, not the high-current load path.
## M9N GPS Module
The dashboard enclosure will include an M9N GPS module connected to the ESP32-S3 dashboard over UART. It will provide GPS fix status, satellite count, position, speed, and UTC time. Future work will use GPS time/location for automatic timezone and DST handling.