ESPHome Smartmeter Reader for Wiener Netze

This is a custom component for ESPHome to integrate a smartmeter provided by Wiener Netze into Home Assistant via the infrared "Kundenschnittstelle". It gives power and energy readings, both positive and negative for active as well as reactive power.

Device Support

The project is only named after the IM150 because that was the first smartmeter that was suppported. Below is an overview of currently supported devices:

Supported and tested

• IM150
• IM151
• IM350

Possibly supported but untested

Currently unsupported

• AM550

If you have one of the untested or unsupported devices (or any other devices supplied by Wiener Netze) and are willing to help me test this component, please open an issue.

Installation and usage

Add the following code to your yaml file. Dont forget to add your encryption key from the smartmeter website otherwise it will not work.

external_components:
  - source: github://bernikr/esphome-wienernetze-im150-smartmeter

logger:
  baud_rate: 0

uart:
  tx_pin: 1
  rx_pin: 3
  baud_rate: 9600

im150:
  key: <enter your key here>

sensor:
  - platform: im150
    active_energy_pos:
      name: Energy
    active_power_pos:
      name: Power
    active_energy_neg:
      name: Negative Energy
    active_power_neg:
      name: Negative Power
    reactive_energy_pos:
      name: Reactive Energy
    reactive_power_pos:
      name: Reactive Power
    reactive_energy_neg:
      name: Reactive Negative Energy
    reactive_power_neg:
      name: Reactive Negative Power

text_sensor:
  - platform: im150
    active_energy_pos:
      name: Energy Raw
    active_energy_neg:
      name: Negative Energy Raw
    reactive_energy_pos:
      name: Reactive Energy Raw
    reactive_energy_neg:
      name: Reactive Negative Energy Raw

For every sensor normal esphome sensor configs can be used to set name, id, icon, etc. or add filters and so on.

Warning
All energy sensors roll over every 1000 kWh and start again from 0 due to precision issues of ESPHome. (Sensors are always 32bit floats. If the meter is too high the sensor cant update every Wh anymore.)
This is not a problem when using the active_energy_pos sensor for the energy dashboard in Home Assistant as it is set to total_increasing and therefore Home Assistant knows that a drop from 1000 to 0 is a reset of the counter and not a negataive consumption of 1000kWh.

As an alternative you can use the text_sensors which always result in the full counter of the meter (in Wh not kWh) but using them further would require a bit post processing (probably a template sensor) in Home Assistant in order to use them as proper numeric sensors.

Tested Hardware

This component shoud work on all ESP8266 and ESP32 microcontrollers with an IR read-head attached to them. I used a ready made read-write head with an ESP01s built in that I got for 30€ on ebay.

Thanks

The following resources were much help in the development of this component:

• https://github.com/aldadic/esp32-smartmeter-reader
• https://github.com/aburgr/smartmeter-reader
• https://github.com/DomiStyle/esphome-dlms-meter
• https://www.lteforum.at/mobilfunk/wiener-netze-smart-meter-auslesen.16222/
• https://gist.github.com/pocki80/941fa090a8d6269a9b3b68c195f8750f

Thanks to @cyranosaurus for helping me test the code on the IM151.