Power metering for the Sonoff Dual R3 r1.6 using esphome

Note: The CSE7761 is now supported by ESPhome!

Al little while back we published this article on the new Sonoff Dual R3. We mentioned that the only disadvantage was that esphome did not yet support power metering as esphome has no support for the CSE7761 chip used for power metering.

That has now changed with this custom module for the CSE7761 made by Berfenger that works just great!

Please mind that this only works on PCB revision 1.6.

Here’s the modified version of our config that includes this module:

substitutions:
  devicename: sonoff-dualr3
  long_devicename: Sonoff DualR3
  
external_components:
  - source: github://berfenger/esphome_components
    components: [ cse7761 ]

esphome:
  name: $devicename
  platform: ESP32
  board: esp32dev

wifi:
  ssid: !secret esphome_wifi_ssid
  password: !secret esphome_wifi_password
  power_save_mode: light
  ap:
    ssid: $devicename
    password: !secret esphome_ap_password

captive_portal:
  
api:
  password: !secret esphome_api_password

ota:
  password: !secret esphome_ota_password

web_server:
  port: 80

logger:
  baud_rate: 0

# remove # below to enable ble tracking
#esp32_ble_tracker:

uart:
  tx_pin: GPIO25
  rx_pin: GPIO26
  baud_rate: 38400
  parity: EVEN
  stop_bits: 1
  
sensor:
  - platform: wifi_signal
    name: "$long_devicename WiFi Signal"
    update_interval: 60s
  - platform: cse7761
    update_interval: 5s
    voltage:
      name: "$long_devicename Voltage"
    current_1:
      name: "$long_devicename Current 1"
    current_2:
      name: "$long_devicename Current 2"
    active_power_1:
      name: "$long_devicename Power 1"
    active_power_2:
      name: "$long_devicename Power 2"

output:
  - platform: gpio
    pin: GPIO27
    id: relay1
  - platform: gpio
    pin: GPIO14
    id: relay2

switch:
  - platform: output
    name: "$long_devicename - relay 1"
    output: relay1
    id: sw1
  - platform: output
    name: "$long_devicename - relay 2"
    output: relay2
    id: sw2

status_led:
  pin:
    number: GPIO13
    inverted: yes

binary_sensor:
  - platform: gpio
    pin:
      number: GPIO0
      mode: INPUT_PULLUP
      inverted: True
    name: "$long_devicename button"
    on_press:
      - logger.log: "$long_devicename button"
      - switch.toggle: sw1
  - platform: gpio
    pin:
      number: GPIO32
      mode: INPUT_PULLUP
      inverted: True
    name: "$long_devicename switch 1"
    on_press:
      - logger.log: "$long_devicename switch 1"
      - switch.toggle: sw1
  - platform: gpio
    pin:
      number: GPIO33
      mode: INPUT_PULLUP
      inverted: True
    name: "$long_devicename switch 2"
    on_press:
      - logger.log: "$long_devicename switch 2"
      - switch.toggle: sw2

If you would like to change power usage to kW in stead of Watt in ESPhome change:

    active_power_1:
      name: "$long_devicename Power 1"
      id: act_power_1
      filters:
        - multiply: 0.001
      unit_of_measurement: kW
    active_power_2:
      name: "$long_devicename Power 2"
      id: act_power_2
      filters:
        - multiply: 0.001
      unit_of_measurement: kW

If you like to add a sensor for kW usage, do so in Home Assistant:

sensor:
  - platform: template
    sensors:
      sonoff_dual_kilowatt_sensor_1:
        friendly_name: "Sonoff Dual Kilowatt Sensor 1"
        unit_of_measurement: "kW"
        value_template: "{{ states('sensor.your_esphome_active_power_1_sensor_name') | float * 0.001 }}"

  - platform: template
    sensors:
      sonoff_dual_kilowatt_sensor_2:
        friendly_name: "Sonoff Dual Kilowatt Sensor 2"
        unit_of_measurement: "kW"
        value_template: "{{ states('sensor.your_esphome_active_power_2_sensor_name') | float * 0.001 }}"

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