weewx on openwrt - weewx/weewx GitHub Wiki

Run weeWX on OpenWRT

This is a guide to running weeWX on OpenWRT with Oregon Scientific WMR200.

Pre-Requisites

  • OpenWRT Chaos Calmer 15.05 (what i did it on, but you could do it on any version likely)

  • About 10Mb free space, once source packages are compiled, installed and removed it takes up about 7Mb

  • Packages from repo via webui or ssh opkg:

    • python-light
    • libusb-1.0
    • openssh-sftp-server (optional, provides sftp access, handy for file editing)

  • Python packages from the repo

    • python-distutils
    • python-codecs
    • python-openssl
    • python-logging
    • python-email
    • python-decimal
    • python-ctypes
    • python-sqlite3

  • Python packages from source (ie not in repo) "python setup.py install" (they are not from dev site, to not use https for wget)

    • configobj http://pypi.upc.edu/mirror/configobj/configobj-5.0.6.tar.gz
    • six http://pkgs.fedoraproject.org/repo/pkgs/python-six/six-1.10.0.tar.gz/34eed507548117b2ab523ab14b2f8b55/six-1.10.0.tar.gz
    • pyusb http://internode.dl.sourceforge.net/project/pyusb/PyUSB%201.0/1.0.0/pyusb-1.0.0.tar.gz

  • Weewx source code, Install section here: http://www.weewx.com/docs/setup.htm (once installed you can save about 1mb by deleting the examples, docs and skins folders)

weeWX Configuration

In weewx.conf I disabled reports to save installing some more packages:

report_services = weewx.engine.StdPrint

Add the driver section:

[WMR200]
    # This section is for the Oregon Scientific WMR200
    
    # The station model, e.g., WMR200, WMR200A, Radio Shack W200
    model = WMR200
    
    # The driver to use:
    driver = weewx.drivers.wmr200
    
    archive_interval = 300

Then force archive interval for your station setting: in [WMR200] and [StdArchive] sections:

[StdArchive]
    
    # If the station hardware supports data logging then the archive interval
    # will be downloaded from the station. Otherwise, specify it (in seconds).
    archive_interval = 300

Then to fix error with backend driver missing you need to help the /home/weewx/bin/weewx/drivers/wmr200.py driver file find the installed usb driver:

import usb

import usb.backend.libusb1
backend = usb.backend.libusb1.get_backend(find_library=lambda x: "/usr/lib/libusb-1.0.so")

The above described issue and the fix does not only apply to the wmr200.py file but it seems relevant for all usb based drivers. It certainly applies as well for the fousb.py driver which supports a huge variety of weather stations manufactured by Fine Offset!

Now it should run! You can monitor system log for weewx messages in ssh -> "logread -f"

init script

I added this startup init script: /etc/init.d/weewxd

#!/bin/sh /etc/rc.common
# Simple weewkd initd for openwrt
# Note paths used if different.
# www.httech.com.au

START=99
STOP=99

start() {        
        logger "starting weewx"
        # commands to launch application
        /home/weewx/bin/weewxd --daemon /home/weewx/weewx.conf
}       

stop() {          
        logger "stopping weewx"
        # commands to kill application 
        kill -9 `cat /var/run/weewx.pid`        
}

restart() {          
        logger "restarting weewx"
        # commands to kill application 
        kill -HUP `cat /var/run/weewx.pid`
        /home/weewx/bin/weewxd --daemon /home/weewx/weewx.conf
}

Credits

Hayden Thring

References

https://groups.google.com/forum/#!topic/weewx-user/M8Jpy4Fosp0