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ESPHome devices

Doorbell Interface for ABB-Welcome: ESPHome

Doorbell Interface for ABB-Welcome (other devices, ESP32): GPIO pinout and a starter ESPHome config with relays, buttons, LED. Local Home Assistant control with no cloud.

Type
Other devices
Chip
ESP32
Region standard
GLOBAL

Pinout

PinFunction
GPIO2Wifi LED
GPIO25Bus RX
GPIO26Bus TX

Find it in shops: AliExpress

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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: doorbell-interface-for-a

esphome:
  name: ${name}
  friendly_name: "Doorbell Interface for ABB-Welcome"

esp32:
  board: esp32dev

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:

status_led:
  pin:
    number: GPIO2
    inverted: false  # Wifi LED

# Other pins from the pinout:
#   GPIO25: Bus RX
#   GPIO26: Bus TX

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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