ModbusLogMQTT

Energy Meter Logger

Log your Energy Meter data on a Raspberry Pi and plot graphs of your energy consumption. Its been verified to work with a Raspberry Pi with a Linksprite RS485 shield and reading values from a WEBIQ131D / SDM120. By changing the meters.yml file and making a corresponding [model].yml file it should be possible to use other models.

Requirements

Hardware

• Raspberry Pi 3
• RS485 Shield V3 for RPi: http://linksprite.com/wiki/index.php5?title=RS485/GPIO_Shield_for_Raspberry_Pi_V3.0
• Modbus based Energy Meter, e.g WEBIQ 131D / Eastron SDM120 or WEBIQ 343L / Eastron SMD630

Software

• Rasbian
• Python 2.7 and PIP
• Minimalmodbus
• InfluxDB
• Grafana

Prerequisite

• Download Raspbian Stretch Lite and Flash on SD-card, e.g. by using Etcher https://www.raspberrypi.org/downloads/raspbian/
• Mount the RS485 shield on the Raspberry Pi’s GPIO header.
• Power up Rasberry Pi and setup password (passwd) and SSH, localization, network etc using sudo raspi-config
• With raspi-config open, go to “5 Interfacing Options” -> “P6 Serial” and disable serial login shell and Enable serial port hardware (NO and then YES)

• Add the following lines to /boot/config.txt'

  # Disable built in Bluetooth
  dtoverlay=pi3-miniuart-bt
  

  source: http://www.briandorey.com/post/Raspberry-Pi-3-UART-Boot-Overlay-Part-Two

• To disable the serial console, you need to edit the /boot/cmdline.txt file to look like the following row

  dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4  elevator=deadline fsck.repair=yes rootwait
  

  source: http://www.briandorey.com/post/Raspberry-Pi-3-UART-Boot-Overlay-Part-Two

• Install Python Package Manager PIP if not already installed (not installed on Rasbian Lite):

  $ sudo apt-get install python-pip
  

Installation

Install InfluxDB

source: https://docs.influxdata.com/influxdb/v1.3/introduction/installation/

Step-by-step instructions

• Add the InfluxData repository

  $ curl -sL https://repos.influxdata.com/influxdb.key | sudo apt-key add -
  $ source /etc/os-release
  $ test $VERSION_ID = "9" && echo "deb https://repos.influxdata.com/debian stretch stable" | sudo tee /etc/apt/sources.list.d/influxdb.list
  

• Download and install

  $ sudo apt-get update && sudo apt-get install influxdb
  

• Start the influxdb service

  $ sudo service influxdb start
  

$ sudo service influxdb restart
  

• Create the database

  
$ sudo influx
  
CREATE DATABASE db_meters
  exit

  

Install Grafana

source: http://docs.grafana.org/installation/debian/

Step-by-step instructions

• Add APT Repository

  $ echo "deb https://dl.bintray.com/fg2it/deb-rpi-1b jessie main" | sudo tee -a /etc/apt/sources.list.d/grafana.list
  

• Add Bintray key

  $ curl https://bintray.com/user/downloadSubjectPublicKey?username=bintray | sudo apt-key add -
  

• Now install

  $ sudo apt-get update
  
$ sudo apt-get install grafana

  

• Start the service using systemd:

  $ sudo systemctl daemon-reload
  $ systemctl start grafana-server
  $ systemctl status grafana-server
  

• Enable the systemd service so that Grafana starts at boot.

  $ sudo systemctl enable grafana-server.service
  

• Go to http://localhost:3000 and login using admin / admin (remember to change password)

Install Energy Meter Logger:

• Download and install from github

  $ pip install git+https://github.com/samuelphy/energy-meter-logger
  

• Make script file executable

  $ chmod 777 read_energy_meter.py
  

• Edit meters.yml to match your configuration

• Test the configuration by running:

  ./read_energy_meter.py
  

• Run the python script at startup Add to following lines to the end of /etc/rc.local but before exit:

  # Start Elphy Energy Meter Logger
  /home/pi/read_energy_meter.py --interval 60 > /var/log/meter.log &