Description

Read/parsing the output of my "Drehstromzähler" eHZ E3L - AW11112 using the IR optical head from volkszaehler.org.

Goal: Push the output to an InfluxDB instance.

Getting started

Build the binary:

git clone https://github.com/adiesner/eHzLogger.git
cd eHzLogger
mvn clean package assembly:assembly

Copy jar to your Raspberry Pi:

scp target/eHzLogger*-jar-with-dependencies.jar username@raspberrypi:~

Install Java on Raspberry Pi:

sudo apt install openjdk-8-jre librxtx-java

Install the IR head to your eHZ. Connect it with your Raspberry Pi.

Test the connection (should output some hex code every second):

sudo chmod 777 /dev/ttyUSB0
stty -F /dev/ttyUSB0 1:0:8bd:0:3:1c:7f:15:4:5:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0
cat /dev/ttyUSB0 | od -tx1

Start eHzLogger on Raspberry Pi

java -jar eHzLogger*-jar-with-dependencies.jar

Should output every second

Got SML_File
Server-ID: 00:00:00:00:00:00:00:00:00:00
1-0:1.8.0*255 = 5608758,5 Wh (Wirkenergie_Total_Bezug)
1-0:1.8.1*255 = 5608758,5 Wh (Wirkenergie_Tarif_1_Bezug)
1-0:1.8.2*255 = 0,0 Wh (Wirkenergie_Tarif_2_Bezug)
1-0:16.7.0*255 = 48,1 W (Aktuelle_Gesamtwirkleistung)

Adjust the settings by copying the file resources/application.properties next to the jar.

Start eHzLogger with a custom application.properties file.

java -jar eHzLogger*-jar-with-dependencies.jar application.properties

The end result using InfluxDb and Grafana

Using Grafana it is quite easy to display the smart meter values in a nice graphical way.

The image is created using this query:

SELECT mean("Aktuelle_Gesamtwirkleistung") FROM "strom" WHERE $timeFilter GROUP BY time($__interval) fill(null)

Collecting data with telegraf

application.properties

# Enable output as json via http server on /ehzlogger
output.httpserver.enabled=true
# bind to ip
output.httpserver.ip=127.0.0.1
# http server listening on port
output.httpserver.port=8975

telegraf.conf

[[inputs.http]]   
    urls = [                                                                    
        "http://127.0.0.1:8975/ehzlogger"
    ]                               
    data_format = "json"

Test your telegram configuration

telegraf -config ./telegraf.conf -test
...
> http,host=NanoPi-M1,url=http://127.0.0.1:8975/ehzlogger Aktuelle_Gesamtwirkleistung=1677701.2,Wirkenergie_Tarif_1_Bezug=20297973.2,Wirkenergie_Tarif_2_Bezug=0,Wirkenergie_Total_Bezug=20297973.2 1618328919000000000

Links

• Library to parse SML protocol: https://github.com/n-st/collectd-sml

Other Projects

• Worked but regex did not match for my EHZ E3L: https://github.com/z0mt3c/ehz-sml-reader