BN Link Power Monitoring Plug

Product Details

15A, 1875W rating - but don't use it for anywhere near this much, as the plug is NOT UL listed (though it does say it "conforms to" a UL standard)

• Amazon.com

Configuration

Note this configuration uses substitution, for some variables and for the ESPHome !secrets (requires a secrets.yaml file in the ESPHome directory). Or you can just replace the secret callouts with your values.

Calibration

The current_res and voltage_div values were calibrated using a Kill-a-Watt. The KaW was placed between the plug and the wall, with the load attached to the plug. A 90W bulb was used as a steady resistive load. Individual plugs will have variation on these values, and they can be adjusted as needed. Alternatively the calibrate_linear ESPHome filter can be used to further improve the calibration using multiple data points.

Configuration File

Configuration file, reproduced below. Note below may be out of date to the repo configuration file, but is provided for reference:

# Configuration for BN-Link BNC-60/U133TJ

substitutions:
  plug_name: bnlink_01
  # Plug state to set upon powerup (or after power loss)
  # See options here: https://esphome.io/components/switch/gpio.html
  restore_mode: ALWAYS_ON
  
  # Base calibration to 90W lightbulb, Kill-a-Watt between plug and wall
  # Detail calibration can be done with calibrate_linear sensor filters below
  current_res: "0.00243"
  voltage_div: "755"
  # Increasing current_res reduces reported wattage
  # Increasing voltage_div increases reported voltage

esphome:
  name: ${plug_name}
  platform: ESP8266
  board: esp01_1m
  includes:
    - espsense.h
  # Uses the ESPAsyncUDP library
  libraries:
    - "ESPAsyncUDP"
    - "[email protected]"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_pass
  fast_connect: on

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "${plug_name} Fallback Hotspot"
    password: !secret ap_pass

ota:
  safe_mode: True
  password: !secret ota_pass

captive_portal:

# Enable logging
logger:
  # level: DEBUG
  baud_rate: 0 # Disable UART logging, we have no physical connections!

# Home Assistant API
# Comment out if not using API, but you'll also need to remove the total_daily_energy and
# time sensors below
api:

time:
  - platform: homeassistant
    id: homeassistant_time
    
binary_sensor:
  - platform: gpio
    pin:
      number: GPIO3
      inverted: True
    name: "${plug_name} Button"
    on_press:
      then:
        - switch.toggle: "relay"

switch:
  # Main plug control relay
  - platform: gpio
    name: "${plug_name} Relay"
    id: "relay"
    pin: GPIO14
    restore_mode: ${restore_mode}
    # Use blue LED to indicate relay state
    on_turn_on:
      - switch.turn_on: "led_blue"
    on_turn_off:
      - switch.turn_off: "led_blue"
    
  - platform: gpio
    name: "${plug_name} LED Blue"
    id: "led_blue"
    pin: GPIO13
    inverted: True
    restore_mode: ${restore_mode} # Matches relay
  
  # Red LED used for ESPHome status below, but this could be
  # reconfigured for other purposes!
  # - platform: gpio
  #   name: "${plug_name} LED Red"
  #   id: "led_red"
  #   pin: GPIO1
  #   inverted: True
  #   restore_mode: ALWAYS_OFF

status_led:
  # Use Red LED as ESPHome's built-in status indicator
  pin:
    number: GPIO1
    inverted: True
  
sensor:
  - platform: hlw8012
    sel_pin:
      number: GPIO12
      inverted: True
    cf_pin: GPIO4
    cf1_pin: GPIO5
    current_resistor: ${current_res}
    voltage_divider: ${voltage_div}
    current:
      name: "${plug_name} Amperage"
      unit_of_measurement: A
      filters:
        # - calibrate_linear:
        #   # Map X (from sensor) to Y (true value)
        #   # At least 2 data points required
        #   - 0.0 -> 0.0
        #   - 1.0 -> 1.0 #load was on
    voltage:
      name: "${plug_name} Voltage"
      unit_of_measurement: V
      filters:
        # - calibrate_linear:
        #   # Map X (from sensor) to Y (true value)
        #   # At least 2 data points required
        #   - 0.0 -> 0.0
        #   - 1.0 -> 1.0 #load was on
    power:
      id: "wattage"
      name: "${plug_name} Wattage"
      unit_of_measurement: W
      filters:
        # - calibrate_linear:
        #   # Map X (from sensor) to Y (true value)
        #   # At least 2 data points required
        #   - 0.0 -> 0.0
        #   - 1.0 -> 1.0 #load was on
    change_mode_every: 8
    update_interval: 3s # Longer interval gives better accuracy
    
  - platform: total_daily_energy
    name: "${plug_name} Total Daily Energy"
    power_id: "wattage"
    filters:
        # Multiplication factor from W to kW is 0.001
        - multiply: 0.001
    unit_of_measurement: kWh
    
  # Extra sensor to keep track of plug uptime
  - platform: uptime
    name: ${plug_name} Uptime Sensor
    
custom_component:
- lambda: |-
    auto sensor_power = new ESPSense(id(wattage), 120);
    return {sensor_power};