arlecplug.yaml

substitutions:
  device_name: "smartplug1"
  name: "SmartPlug1"

esphome:
  name: ${device_name}

bk72xx:
  board: wb2s
  framework:
    version: dev

# Enable Home Assistant API
api:
  encryption:
    key: !secret hass_key

ota:
  platform: esphome
  password: !secret hass_password

web_server:
  port: 80
  auth:
    username: !secret web_server_user
    password: !secret web_server_password

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot in case wifi connection fails
  ap:
    ssid: ${device_name}
    password: !secret wifi_password

captive_portal:

logger:

binary_sensor:    # the button
  - platform: gpio
    pin: P11
    name: ${device_name} button
    id: button
    device_class: window
    # when button is pressed, toggle the switch on/off
    on_press:
      then:
        - switch.toggle: relay

switch:          # the relay
  - platform: gpio
    pin: P6
    name: ${name}
    id: relay
    restore_mode: always off   # default when power is turned on
    icon: mdi:power-socket-au
    # synchronise the LED with the relay
    on_turn_on:
      then:
        - output.turn_on: button_led
    on_turn_off:
      then:
        - output.turn_off: button_led

output:        # the light in the button
  - platform: gpio
    id: button_led
    pin: P26
#    restore_mode: always off   # default when power is turned on

#
# PC191HA sensors - power monitoring and wifi signal
#
sensor:
  - platform: wifi_signal         # report wi-fi signal strength from this end
    name: $name WiFi Signal
    id:   ${device_name}_wifi_signal
    update_interval: 30s    # how often to report wifi signal strength

    # PC191HA includes a BL0937 chip for measuring power consumption
    #     and BL0937 is a variation of hlw8012, but using inverted SEL pin functionality
  - platform: hlw8012
    model: BL0937     # note that the model must be specified to use special calculation parameters
    sel_pin:          # I believe that cf_pin reports either Voltage or Current depending on this select pin
      inverted: true  # determine whether true reports Voltage
      number: P24
    cf_pin:           # current or voltage (ele_pin: 7)
      inverted: true  # the logic of BL0937 is opposite from HLW8012
      number: P7
    cf1_pin:          #  Power (vi_pin: 8)
      inverted: true  # the logic of BL0937 is opposite from HLW8012
      number: P8

    update_interval: 15s      # How often to measure and report values

    # PC191HA measures and returns Voltage OR Current according to the value of sel_pin,
    #   but it can change the value of sel_pin periodically  
    initial_mode: "VOLTAGE"       # reports VOLTAGE or CURRENT
    change_mode_every: 4          # how many times to report before swapping between
        #   reporting Voltage or Current. Note that the first value reported should be ignored as inaccurate

    # Adjust according to the actual resistor values on board to calibrate the specific unit
    voltage_divider:  775     # LOWER VALUE GIVES LOWER VOLTAGE
    current_resistor: 0.0009  # HIGHER VALUE GIVES LOWER WATTAGE

    #
    # how the power monitoring values are returned to ESPHome
    #

    voltage:
      name: $name Voltage
      id:   ${device_name}_voltage
      unit_of_measurement: V
      accuracy_decimals: 1
      filters:
        - skip_initial: 2
    power:
      name: $name Power
      id:   ${device_name}_power
      unit_of_measurement: W
      accuracy_decimals: 2
      filters:
        - skip_initial: 2

    # power should simply be current x voltage -- except that the pc191ha doesn't follow that formula.  
    # Setting current_resistor to give an accurate Amperage does NOT also give the correct Wattage
    # so here I calculate current from power and voltage

  - platform: template  
    name: $name Current
    id:   ${device_name}_current
    unit_of_measurement: A
    accuracy_decimals: 2
    update_interval: "30s"
    lambda: |-
      return (id(${device_name}_power).state / id(${device_name}_voltage).state);
    filters:  
      - skip_initial: 2

  - platform: uptime
    name: $name Uptime
    id:   ${device_name}_uptime
    update_interval: "30s"