# 6. Patron FPV Reference

### 6.1 ATTAD Board — Power and Connectivity

<table><thead><tr><th width="286.5712890625">Feature</th><th>Detail</th></tr></thead><tbody><tr><td>5V power for external devices</td><td>UART_JET connector on ATTAD board provides 5V with sufficient current for a USB hub (1A+)</td></tr><tr><td>Jetson↔FMU connection</td><td>USB only (ttyACM0); single connection — no additional UART available between Jetson and FMU on ATTAD</td></tr><tr><td>Maximum Jetson power mode</td><td>MAXN supported up to 25 W on Orin Nano variant</td></tr><tr><td>LTE module (Orin NX)</td><td>After SIM activation, set APN via ModemManager; verify routing table — the modem interface must be set as default route for internet traffic</td></tr></tbody></table>

***

### 6.2 ELRS Binding

If rebinding the Patron to a new ELRS transmitter fails or the RX Wi-Fi no longer appears:

* ELRS RX and TX module firmware versions must match exactly
* Verify versions in ExpressLRS configurator under the ELRS logo/version header
* Update TX or RX to match the other's version before attempting to set a new bind phrase
* If the RX Wi-Fi hotspot is not visible after power-on, the RX may have exited Wi-Fi mode — power cycle the drone and connect within the first 60 seconds

***

### 6.3 MAVLink / mavlink-router on Patron

On Patron FPV, mavlink-router connects to the FMU via USB (/dev/ttyACM0). If mavlink-router.service fails repeatedly on boot, it may be starting before the USB device enumerates. Increase the service restart delay:

```
[Service]
RestartSec=5s
```

The MAV\_SYS\_ID parameter should be unique for each drone (1–254) to avoid conflicts when multiple drones are powered simultaneously on the same network.


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