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Document optional Nano TX to ESP RX wire

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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mangavalkandClaude Opus 5.5 committed 2026-10-13 00:12:35 +02:00
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src/nano/README.md
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@@ -78,3 +78,4 @@ pinout.
| ROW_RESET | D13 |
| ROW_SET | A5 |
| Serial RX | D0 (from ESP32 TX) |
| Serial TX | D1 (to ESP32 RX, through a 5 V → 3.3 V voltage divider). Optional: needed for `READY`. Without it, the ESP waits the full 3 s timeout. |