Smart meter logger

A smart meter logger for the dutch smart meters with a P1 (RJ11) port. In this case a Landys+Gir E350, but it should work for other types with this port. The device is connected via RJ11 -> USB to a Raspberry Pi.

Usage

usage: smartmeter.py [-h] [--data DATA] [--kwh1 KWH1] [--kwh2 KWH2]
[--gas GAS] [--port PORT] [--logfile LOGFILE]
[--loglvl LOGLVL]
A smart meter logger for the dutch smart meters with a P1 (RJ11) port.
optional arguments:
-h, --help show this help message and exit
--data DATA Read data from file, for testing
--kwh1 KWH1 Price of a kWh at low tariff
--kwh2 KWH2 Price of a kWh at high tariff
--gas GAS Price of a cubic meter of gas (m3)
--port PORT Serial port to read from
--logfile LOGFILE File to log output to
--loglvl LOGLVL Set the loglevel in {DEBUG, INFO, WARNING, ERROR,
CRITICAL}

Program Output

The program writes all data to a round-robin database using rrdtool. In this case, every 10 seconds. This program requires the databases to exist, use createdb.py for that.

Hardware

As stated, the smart meters uses a RJ11 port (P1) which needs to be connected to the serial input (Sub-D) of a serial-to-usb converter. This requires some soldering of the datacables, the schema is shown in the following table:

RJ11	Sub-D	Signal
1	-	-
2	4	RTS
3	5	GND
4	-	-
5	2	RxD
6	-	-

Where the pin numbers of both RJ11 and Sub-D are counted from left to right when facing the front of the connector.