arwn 2.1.0

Collect 433Mhz weather sensor data and publish to mqtt

Ambient Radio Weather Network (arwn)

Collect 433 MHz weather sensor data and publish to MQTT.

Designed to work with an RFXCOM USB receiver or an RTL-SDR dongle, publishing sensor readings over MQTT so they can be consumed by other software such as Home Assistant.

Hardware Requirements

You will need a Linux system (a Raspberry Pi 3 or later is sufficient) and a 433 MHz receiver:

• RTL-SDR dongle (~$25 on Amazon) — recommended default. Requires rtl_433 installed separately.
• RFXCOM receiver — more expensive, narrower sensor support, better hardware error correction. All supporting software is bundled.

Installation

Install rtl_433 (RTL-SDR users only)

Follow the rtl_433 installation instructions. On Debian/Ubuntu a package is available:

sudo apt-get install rtl-433

Install arwn

pip install arwn

Configuration

Copy config.yml.sample to config.yml and edit:

collector:
  type: rtl433        # or rfxcom
  # device: /dev/ttyUSB0   # rfxcom only

mqtt:
  server: 192.168.1.x
  # username: user
  # password: pass

# Optional: Weather Underground reporting
wunderground:
  user: [e-mail]
  station: KXXYYY123
  passwd: yourpassword

# Map hardware sensor IDs to friendly names.
# IDs survive battery changes when named here.
# An "Outside" sensor is required for Weather Underground.
names:
  "ae:01": Outside
  "e9:00": Living Room

Running as a systemd service (recommended)

Install and enable the systemd user service:

arwn-install-service --config ~/.config/arwn/config.yml

The service will start immediately, start at boot, and restart automatically on failure. No sudo required.

To check status:

systemctl --user status arwn
journalctl --user -u arwn -f

RFXCOM USB access

If using an RFXCOM receiver, add yourself to the dialout group (one-time):

sudo usermod -aG dialout $USER

Log out and back in for the change to take effect, then re-run arwn-install-service.

Running manually

arwn-collect -f --config config.yml

Development

See CONTRIBUTING.md and AGENTS.md.

License

Apache 2.0 — see LICENSE.

Credits

Sean Dague