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.