I have a PC and bridge running off of a single Envi by having the PC
provide a serial port signal out to the bridge while receiving the
ENVI data stream from the CC USB cable. I had an Envi data connection
before the bridge was introduced and rather than replace the PC I
added the bridge. The PC I use is a laptop and uses about 15 watts of
power 24/7. The connection between the PC and the bridge uses a
hardware modified (cable cutting and RJ plug attachment) CA-42 'Nokia
USB phone cable' which uses a similar USB interface to the Envi. The
serial data stream is 'multiplexed' using virtual serial port emulator
(VSPE) and some python scripts to the current cost google power meter
client on the PC, the bridge through the modified USB serial
connection and UDP packet for other PC software development.
Additional data logging by SQLite and recording the XML data stream
are also done by the PC. I will be implementing a local web server to
http broadcast the local 6 second line power readings to allow a hand
held device (eg smart phone) to be used as a "wireless Envi display"
to provide real time feedback for investigating power consumption by
device and by phase -- line1 or line2. When the new current cost
board goes mainstream and provides some file support / attachments I
will provide the python scripts and any other details. Eventually I
hope to replace the PC with an Arduino and a pogoplug (Dockstar).