Home Assistant and Eastron Energy Meter Communication

esphome-8266-sdm230-reader.yaml

esphome:
  name: sdm230_modbus_reader
  platform: ESP8266
  board: nodemcuv2 # For NodeMCU v3

# Wi-Fi connection setup
wifi:
  ssid: !secret wifi_ssid_iot
  password: !secret wifi_password_iot

  # Enable fallback hotspot in case Wi-Fi connection fails
  ap:
    ssid: "SDM230 Fallback Hotspot"
    password: "AP_PASSWORD"

  # Optional: static IP configuration
  manual_ip:
    static_ip: 192.168.0.118
    gateway: 192.168.0.1
    subnet: 255.255.255.0

# Enable OTA for wireless firmware updates
ota:
  password: !secret ota_sdm230_password

# Enable logging
logger:
  baud_rate: 0 # Disable logging over UART (useful for RS485)

switch:
  - platform: gpio
    pin: D2 # Connect both DE and RE to this pin
    id: rs485_control
    name: "RS485 DE/RE Control"

# UART configuration for RS485
uart:
  tx_pin: D4 # GPIO2 on ESP8266 (TX) -- DI
  rx_pin: D3 # GPIO0 on ESP8266 (RX) -- RO
  baud_rate: 9600
  parity: NONE
  stop_bits: 1

# Modbus Controller Setup
modbus:
  id: modbus1
  uart_id: uart
  flow_control_pin: rs485_control # Use the combined control pin

# Eastron SDM230M Sensor Readings
sensor:
  - platform: modbus_controller
    modbus_id: modbus1
    id: voltage
    name: "SDM230 Voltage"
    address: 0x0000
    unit_of_measurement: "V"
    slave_id: 1 # SDM230 Modbus address
    value_type: FLOAT # 32-bit floating point
    accuracy_decimals: 1

  - platform: modbus_controller
    modbus_id: modbus1
    id: current
    name: "SDM230 Current"
    address: 0x0006
    unit_of_measurement: "A"
    slave_id: 1 # SDM230 Modbus address
    value_type: FLOAT # 32-bit floating point
    accuracy_decimals: 2

  - platform: modbus_controller
    modbus_id: modbus1
    id: power
    name: "SDM230 Power"
    address: 0x000C
    unit_of_measurement: "W"
    slave_id: 1 # SDM230 Modbus address
    value_type: FLOAT # 32-bit floating point
    accuracy_decimals: 2

  - platform: modbus_controller
    modbus_id: modbus1
    id: energy
    name: "SDM230 Total Energy"
    address: 0x0048
    unit_of_measurement: "kWh"
    slave_id: 1 # SDM230 Modbus address
    value_type: FLOAT # 32-bit floating point
    accuracy_decimals: 2

  # Imported Energy (Forward Active Energy)
  - platform: modbus_controller
    modbus_id: modbus1
    id: imported_energy
    name: "SDM230 Imported Energy"
    address: 0x0048
    unit_of_measurement: "kWh"
    slave_id: 1 # SDM230 Modbus address
    value_type: FLOAT # 32-bit floating point
    accuracy_decimals: 2

  # Exported Energy (Reverse Active Energy)
  - platform: modbus_controller
    modbus_id: modbus1
    id: exported_energy
    name: "SDM230 Exported Energy"
    address: 0x004A
    unit_of_measurement: "kWh"
    slave_id: 1 # SDM230 Modbus address
    value_type: FLOAT # 32-bit floating point
    accuracy_decimals: 2

# Enable web server to access logs/config via a browser
web_server:
  port: 80
  auth:
    username: !secret web_username
    password: !secret web_password