Use rtl-sdr to receive EnergyCount 3000 transmissions.
This module allows you to receive and decode radio transmissions from EnergyCount 3000 energy loggers using a RTL-SDR supported radio receiver and the GNU Radio software defined radio framework.
EnergyCount 3000 transmitters plug between a device and an AC power outlet and monitor electrical energy usage. They transmit a packet with a status update every 5 seconds on the 868 MHz SRD band. Reported values include id of the device, current and maximum seen electrical power, total energy used and device uptime.
The module exports a class that represents the radio receiver. You provide it with a callback function that is called each time a new status update is received:
def callback(state): print state my_ec3k = ec3k.EnergyCount3K(callback=callback) my_ec3k.start() while not want_stop: time.sleep(2) print "Noise level: %.1f dB" % (my_ec3k.noise_level,) my_ec3k.stop()
You can also get the last received state by calling the get method on the object.
Also included is an example command-line client ec3k_recv that prints received packets to standard output.
You need the GNU Radio framework, rtl-sdr and the gr-osmosdr package.
For baseband decoding a pure Python implementation is included in this package (capture.py) and should work out of the box.
For more efficient decoding a C implementation can also be used. Obtain the source from the address below, compile it and make sure capture binary is in PATH. It should then get used automatically instead of the Python implementation.
Occasionally the GNU Radio pipeline isn’t setup correctly. If this happens the noise level constantly stays at -90 dB and no packets are ever received. Restarting the program usually helps. It’s probably a bug in gr-osmosdr or rtl-sdr.
Stopping the receiver sometimes causes a segfault.
Only half of the data from the EnergyCounter 3000 is decoded. The meaning of the rest of the bits is currently unknown.
No CRC or data integrity checks are performed on received packets, which sometimes means the receiver will report bogus readings.
Please send patches or bug reports to <firstname.lastname@example.org>
You can get a local copy of the development repository with:
git clone git://github.com/avian2/ec3k.git
ec3k, software receiver for EnergyCount 3000
Copyright (C) 2012 Tomaz Solc <email@example.com>
Copyright (C) 2012 Gasper Zejn
Protocol reverse engineering: http://forum.jeelabs.net/comment/4020
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.