- Periodically read current power, energy consumption and other OBIS-values from a electricity meter that support the IEC 62056-21 protocol.
- Use LoRa/TTN to send the data to a (public or private) gateway
- The gateway POST's the data to a Home-Assistant WebHook where the data is applied to several template sensors
-
Project is still work in progress (feel free to contribute)
-
In the beginning I was experimenting around with the Heltec lora esp32 micro-controller. That micro-controller is fully Arduino / Platformio compatible and work fine as long as you don't wanna power it by a battery as it consumed a lot of energy even in deep-sleep. Thus I switched to the Heltec CubeCell AB02 series that is specialized for battery operated use-cases.
-
I ran a long dozen of times up and down the staircase (third floor) down to the basement for this project - if you want to avoid that, free to buy me a coffee
- Heltec Cubecell AB02-A
- Powered by 1/2 AA Battery (Saft LS14250 3.6V)
- Heltec Cubecell AB02 Dev Board
Heltec lora esp32 v2 Dev Board
- Based on Arduino IDE
- Follow the instruction provided here: https://github.com/HelTecAutomation/CubeCell-Arduino#installation-instructions
- The CubeCell Arduino version 1.3.0 has some issues that were fixed but not released as of today. If the version 1.4.0 is not released yet, you have to follow the instructions to install the development repository of the Heltec CubeCell boards in Arduino.
- Checkout the project ( directory
./heltec-cubecell) and open the.inofile in the Arduino IDE
Pinout Diagramms:
Connect as following:
- Optical Reading Head: VCC -> VEXT
- Optical Reading Head: GND -> GND
- Optical Reading Head: RX -> RX2 (GPIO 29)
- Optical Reading Head: TX -> TX2 (GPIO 39)
- Rename credentials_example.h to credentials.h and provide your OTAA data
- I generated random hex values for
devEui,appEuandappKey
- I generated random hex values for
- Select the correct board in the Arduino IDE:
- Tools -> Boards -> CubeCell (in sketchbook) -> HTCC - AB02A
- Set the LORAWAN values from within in the Arduino IDE:
- Tools -> LORAWAN_REGION -> your-region (eg. EU_868)
- Tools -> LORAWAN_CLASS -> A
- Tools -> LORAWAN_DEVEUI -> CUSTOM
- Tools -> LORAWAN_NETMODE -> OTAA
- Tools -> AT_SUPPORT -> ON
- Check/Adjust the
ADJUSTMEcomments
-
use the serial monitor in Arduino and change the
DEFAULT_LOG_LEVELtodebugin the ino file- Attention: Make sure once everything works as intended to change it back to
Infoas too much logging has a negative impact on the power consumption (even if there is not serial monitor connected)
- Attention: Make sure once everything works as intended to change it back to
-
The smart meter is not interacted with as long as the LoRaWAN has not been initialized / OTAA-registered
- uncomment the line
deviceState = DEVICE_STATE_SENDin the wakeup procedure to directly read the smart meter data when the on-board user button is pressed without checking/waiting for a successfully LoRaWAN registration
- uncomment the line
-
Send a LoRaWan downlink message from your gateway to change the sleep time on demand. The message is read the next time the node wakes up.
Port: 4 payload: <desired-sleep-time-seconds-in-hex> // 04B0 = 1200 seconds = 20 min -
Make sure you have a decent LoRaWAN connectivity where your smart-meter is located or nearby by using an extension cord/antenna. I played around with a simple LoRaWAN example sketch from Heltec to find a good spot with a decent connectivity:
Examples -> CubeCell -> LoRa -> LoRaWAN -> LoRaWANAnd then verified in my Lora-Gateway if the messages were received and if so, what their RSSI/SNR data were.
- Based on Platformio
- Not suitable for my use-case as it consumed to much power (even in deep-sleep) and thus couldn't get it to operate by battery
- Elster AS3000
SKIP_CHECKSUM_CHECK METER_IDENTIFIER "ELS" BAUDRATE_CHANGE_DELAY: 500 PARITY_SETTING SERIAL_7E1 OBIS_VALUE_POWER "1.7.0 " OBIS_VALUE_TOTAL_ENERGY "1.8.0" INITIAL_BAUD_RATE 300 SERIAL_IDENTIFICATION_READING_TIMEOUT 2000 SERIAL_READING_TIMEOUT 500 MAX_METER_READ_TIME 60
- https://github.com/mwdmwd/iec62056-mqtt
- https://wiki.volkszaehler.org/hardware/channels/meters/power/edl-ehz/elster_as1440
- trigger:
- platform: webhook
webhook_id: lorawan-data
id: lorawan-data
unique_id: smart_meter
sensor:
- name: "Smart Meter Power"
unique_id: smart_meter_power
icon: mdi:flash-outline
unit_of_measurement: W
device_class: power
state_class: measurement
state: >-
{% set payloadHex = trigger.json.data.payload_hex | default(none) %}
{% set value = payloadHex[0:4] %}
{% if value == '0000' %}
{{ none }}
{% else %}
{{ value | int(value,16) }}
{% endif %}
- name: "Smart Meter Kwh"
unique_id: smart_meter_kwh
icon: mdi:chart-histogram
unit_of_measurement: "kWh"
state_class: measurement
device_class: energy
state: >-
{% set payloadHex = trigger.json.data.payload_hex | default(none) %}
{% set value = payloadHex[4:12] %}
{% if value == '00000000' %}
{{ none }}
{% else %}
{{ value | int(value,16)/100|float }}
{% endif %}
- name: "Smart Meter Battery"
unique_id: smart_meter_battery
icon: mdi:battery
unit_of_measurement: "%"
device_class: battery
state: >-
{% set payloadHex = trigger.json.data.payload_hex | default(none) %}
{% set value = payloadHex[12:14] %}
{% if value == '00' %}
{{ none }}
{% else %}
{{ value | int(value,16) }}
{% endif %}
- name: "Smart Meter Battery Voltage"
unique_id: smart_meter_battery_voltage
icon: mdi:battery
unit_of_measurement: "mV"
state_class: measurement
device_class: voltage
state: >-
{% set payloadHex = trigger.json.data.payload_hex | default(none) %}
{% set value = payloadHex[14:18] %}
{% if value == '0000' %}
{{ none }}
{% else %}
{{ value | int(value,16) }}
{% endif %}
- name: "Smart Meter Up-Counter"
unique_id: smart_meter_upcounter
icon: mdi:counter
unit_of_measurement: "times"
state: >-
{% set payloadHex = trigger.json.data.payload_hex | default(none) %}
{% set value = payloadHex[18:20] %}
{% if value == '00' %}
{{ none }}
{% else %}
{{ value | int(value,16) }}
{% endif %}