A custom component for ESPHome for reading meter data sent by the Kaifa MA309M via M-Bus.
- Exposes all data sent from the smart meter as sensors
- Allows grouping data together in a single report for storing in InfluxDB or similar
- Kaifa MA309M
- TINETZ-Tiroler Netze GmbH
- Salzburg Netz GmbH
- Innsbrucker Kommunalbetriebe Aktiengesellschaft
- Vorarlberger Energienetze GmbH
- Voltage L1
- Voltage L2
- Voltage L3
- Amperage L1
- Amperage L2
- Amperage L3
- Active Power Plus
- Active Power Minus
- Active Energy Plus
- Active Energy Minus
- Reactive Energy Plus
- Reactive Energy Minus
- ESP32 (supported by ESPHome)
- RJ11 cable
- M-Bus to UART board (e.g. https://www.mikroe.com/m-bus-slave-click)
- RJ11 breakout board or soldering iron with some wires
- ESPHome 1.15.0 or newer
- Tested with ESP32-POE (should work without problems over wifi)
This software installation guide assumes some familiarity with ESPHome.
- Pull this repository into your ESPHome config files
- Adjust the meter01.example.yaml to your needs, copy it into your ESPHome config folder as meter01.yaml
- Don't forget to add your decryption key in meter01.yaml
- Connect your ESP
- Run
esphome meter01.yaml runand choose your serial port (or do this via the Home Assistant UI) - Disconnect the ESP and continue with hardware installation
- Cut one end of the RJ11 cable and connect wires to pin 3 & 4 OR Plug RJ11 into a breakout board
- Connect everything according to this table:
| ESP32 | M-Bus Board | RJ11 | Notes |
|---|---|---|---|
| 3.3V | 3V3 | - | 3.3V power |
| GND | GND | - | Ground |
| GPIO4 | RX | - | Connect RX from the M-Bus board to TX from the ESP |
| GPIO36 | TX | - | Connect TX from the M-Bus board to RX from the ESP |
| - | MBUS1 | 3 | Connect M-Bus board to smart meter, polarity does not matter |
| - | MBUS2 | 4 | Connect M-Bus board to smart meter, polarity does not matter |