To answer this you should first of all give Flukso itself a look. Flukso is an open source web-based community metering application. It basically consists of two devices combined into one:

• an ATmega based measuring PCB that you can hook up transducers to
• an Atheros based OpenWRT system

The two of them are linked via UART (for Flukso v1 - it's SPI for Flukso v2 which is going to be available any time soon). fluksoUSB ist the ATmega part of Flukso

There is a brilliant description on how to get the hardware to work

The description to fix the sub-1000W-bug can be found here.

• You can find software for it in comsound's github repo. It doesn't give readings below some 1.000 Watts though - still some funny bug in it.
  • has nothing to do with the software, only a hardware-bug, see below
• domke seems to have put together something, too.

• Using comsound's github repo fluksoUSB only gives “0 Watts” below a load of some 1.000 Watts
  • hardware-bug, see questions

• What stops us from using the new flukso code?
  • The new flukso uses SPI for communication, which the current hardware cant handle, but the fluksousb v2 can (currently in planning)
• Why does fluksoUSB only show reasonable values when more than 1.000 Watts are connected?
  • this is due to the offset-error from the ADC of the Atmel, which is higher when running at 5V compared to the 3V in the original flukso v1.
  • To resolv the issue, it is necessary to aply a voltage of about 20mV(for one current clamp, 3 not yet tested) to the ground connector(black wire) of the current clamp. This can be done using a voltage divider(or potentiometer) connected to JP3 1st and last pins. I will provide more detailed instructions (with images) soon.

* Dominik Keller

• mission statement: reading smart meter data via optical interface, using a modified FluksoUSB
• git repo(s): https://github.com/domke/optoreader
• blog/other: optoreader

* Justin Otherguy

• mission statement: get the guys working on fluksoUSB onto one virtual table, make fluksoUSB work against volkszaehler
• git repo(s): -
• blog/other: -

* Stephan Platz

• mission statement: build OpenWRT packages for fluksoUSB
• git repo(s): https://github.com/gonium/msg-flukso
• blog/other: customflukso

* Tobias Jeske

• mission statement: build library for encoding and decoding SML messages, written in C, platform-independent
• git repo(s): -
• blog/other: -

* Maximilian Eckardt

• mission statement: fix hardware-bugs, make new fluksousb, compatible with flukso v2 and optoreader
• git repo(s): https://github.com/comsound/flukso
• blog/other: -