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Document that the relay also powers the Nano

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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 00:07:16 +02:00
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README.md
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@@ -9,14 +9,17 @@ The system uses two microcontrollers:
┌──────────────┐ WiFi / MQTT ┌────────────────┐ UART 115200 ┌──────────────┐ GPIO ┌──────────────┐
│ Home │ ◄─────────────► │ ESP32 │ ──────────────► │ Arduino Nano │ ───────► │ Brose │
│ Assistant │ │ (controller) │ text commands │ (driver) │ │ flipdot │
└──────────────┘ └───────┬────────┘ └──────────────┘ │ panels 84x19 │
│ GPIO 13 └──────▲───────┘
▼ │
┌─────────────┐ display power │
│ Relay │ ───────────────────────────────────────────────────┘
└──────────────┘ └───────┬────────┘ └──────▲───────┘ │ panels 84x19 │
│ GPIO 13 │ └──────▲───────┘
▼ │ power │
┌─────────────┐ │ │
│ Relay │ ─────────────────────────────────┴─────────────────────────┘
└─────────────┘
```
The relay powers both the panels **and the Nano**. When the relay is off, the Nano is off
too, and it boots again each time the relay switches on. Only the ESP32 runs all the time.
| Part | Folder | What it does |
|------|--------|--------------|
| **Arduino Nano** | [src/nano](src/nano/README.md) | Drives the panel's row and column electronics directly. Keeps a frame buffer and flips only the dots that changed. Takes simple text commands over serial. |