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With the addition of an RFM12Pi expansion board to receive data via wireless from other OpenEnergyMonitor modules such as an emonTx energy and temperature monitoring node or an emonGLCD display. A Raspberry Pi used to forward data to an emoncms sever or/and log data locally to a localy instance of Emoncms server running on the Pi.
For hardware designs see https://github.com/openenergymonitor/Hardware/tree/master/RFM2Pi
http://openenergymonitor.org/emon/emonbase/raspberrypi
http://wiki.openenergymonitor.org/index.php?title=RFM12Pi_V2