Software decoder for EnergyCount 3000 devices using rtl-sdr
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README
ec3k_decoder.c
emoncms_reporter.pl

README

ec3k_decoder
============

Software decoder for EnergyCount 3000 devices using rtl-sdr.
rtl_fm (part of rtl-sdr) is used to tune to the frequency of the
energy sensors and to decode FM. The result of the fm decoding
is piped into the ec3k decoder which outputs the decoding result
to stdout in following csv format:
Timestamp,Sensorid,Watts*10,WattSeconds

Compile
gcc ec3k_decoder.c -o ec3k_decoder

Usage
sudo rtl_fm -f 868402000 -s 200000 -A fast - | ./ec3k_decoder

Example output:
1378644760,70b2,37,132688308
1378644764,71b2,1229,13643992
1378644765,70b2,37,132688326
1378644769,71b2,1104,13644589
1378644770,70b2,38,132688345
1378644774,71b2,627,13645072

Runs on Raspberry Pi Rev B (rtl_fm consumes 19% of CPU, ec3k_decoder 10% CPU).

Thomas Fischl <tfischl@gmx.de>