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EKF Сonnect PRO Wi-Fi (RCS-2-WF) Smart Plug: ESPHome

EKF Сonnect PRO Wi-Fi (RCS-2-WF) Smart Plug (smart plugs, BK72XX): GPIO pinout and a starter ESPHome config with relays, buttons, LED and power metering. Local Home Assistant control with no cloud.

Type
Smart plugs
Chip
BK72XX
Region standard
EU

Pinout

PinFunction
P08BL0937 cf_pin
P06BL0937 cf1_pin
P26BL0937 sel_pin
P07Relay
P10Button (Inverted)
P11LED (Inverted)

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Starter ESPHome config

Built from the pinout above. Keys and the Wi-Fi password come from secrets.yaml in ESPHome. Check the pins against your hardware revision before flashing: one model can ship with different boards.

substitutions:
  name: ekf-onnect-pro-wi-fi-rcs

esphome:
  name: ${name}
  friendly_name: "EKF Сonnect PRO Wi-Fi (RCS-2-WF) Smart Plug"

bk72xx:
  board: generic-bk7231n-qfn32-tuya  # BK7231T or BK7231N: check the chip marking

logger:
api:
  encryption:
    key: !secret api_key
ota:
  - platform: esphome
    password: !secret ota_password
wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  ap: {}
captive_portal:

switch:
  - platform: gpio
    pin: P07
    id: relay1
    name: "Relay"  # Relay
    restore_mode: RESTORE_DEFAULT_OFF

binary_sensor:
  - platform: gpio
    pin:
      number: P10
      mode: INPUT_PULLUP
      inverted: true
    name: "Button"  # Button (Inverted)
    on_press:
      - switch.toggle: relay1

status_led:
  pin:
    number: P11
    inverted: true  # LED (Inverted)

sensor:
  - platform: hlw8012
    model: BL0937
    sel_pin:
      number: P26
      inverted: true
    cf_pin: P08
    cf1_pin: P06
    voltage:
      name: "Voltage"
    current:
      name: "Current"
    power:
      name: "Power"
    energy:
      name: "Energy"
    update_interval: 10s
    # calibrate voltage_divider and current_resistor against a known load

How to flash

  • Most devices are flashed over UART: a 3.3 V USB-TTL adapter to RX, TX, GND and 3V3, holding GPIO0 to ground at power-on (ESP8266/ESP32). Mains power disconnected.
  • Beken (BK72xx) and Realtek chips are flashed with ltchiptool, or with cloudcutter without opening the case if the firmware allows it.
  • Details and board photos: the device page in the ESPHome database.

A config from scratch: ESPHome generator. Which pins are safe: pinout.

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