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6. Patron FPV Reference

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6.1 ATTAD Board — Power and Connectivity

Feature
Detail

5V power for external devices

UART_JET connector on ATTAD board provides 5V with sufficient current for a USB hub (1A+)

Jetson↔FMU connection

USB only (ttyACM0); single connection — no additional UART available between Jetson and FMU on ATTAD

Maximum Jetson power mode

MAXN supported up to 25 W on Orin Nano variant

LTE module (Orin NX)

After SIM activation, set APN via ModemManager; verify routing table — the modem interface must be set as default route for internet traffic

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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

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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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