DIY Smart Doorbell

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Summary

I’ve had an old doorbell that was really frustrating, especially when I am sleeping, so I wanted a way to deactivate it easily. I didn’t change much, so it only costed the price of the Sonoff.

I noticed that the signal on my doorbell was 5V and the input was 230V AC, so I had to get creative. I bridged the doorbell signal with a wire so it would think that the button was pressed and I changed the status of the input so that when the doorbell booted, it would immediately “ring”.

Integration

Two sensors are exposed to HomeAssistant:

  • switch.bell: Changes to ON when a button is pressed, but can be manually triggered to ring the bell.
  • switch.bell_active: This activates/deactivates the ringing, but the switch.bell sensor is triggered in case you want to use it on an automation.
    In my case I am using the switch.bell so that it will send me a notification on my phone.

Hardware

  • Sonoff device
  • 230V Doorbell (mine is with chime)
  • Buttons outside the door

You can see my connection diagram:

smart_doorbell (1)
smart_doorbell (1)1896×1122 119 KB

My home is using two buttons for ringing the doorbell, so I’ve implement them on my code. This can easily be removed if it doesn’t meet your needs.

Cables

  • Red: Line (AC)
  • Black: Neutral (AC)
  • Blue: Doorbell Signal (5V DC)
  • White: Sonoff Signal (3.5V DC)

Code

I’ve installed ESPHome on Sonoff which makes things easier change and share:

esphome:
  name: doorbell
  platform: ESP8266
  board: esp01_1m


wifi:
  networks:
  - ssid: 'YOUR_SSID'
    password: 'YOUR_PASSWORD'

api:

logger:

ota:

binary_sensor:
  - platform: gpio  # Up Button
    pin:
      number: GPIO09
      inverted: true
      mode: INPUT_PULLUP
    id: ph_button3
    on_press:
      - script.execute: activate_doorbell
  - platform: gpio  # Down Button
    pin: 
      number: GPIO00
      inverted: true
      mode: INPUT_PULLUP
    id: ph_button4
    on_press:
      - script.execute: activate_doorbell


switch:
  - platform: gpio  # Output Relay
    pin: GPIO12
    id: relay
  - platform: template
    name: "Bell active"
    id: bell_active
    restore_state: true
    optimistic: true
  - platform: template
    name: "Bell"
    id: bell
    restore_state: true
    optimistic: true
    turn_on_action:
      - script.execute: activate_doorbell


script:
  - id: activate_doorbell
    mode: single
    then:
      - switch.turn_on: bell
      - if:
          condition:
            switch.is_on: bell_active
          then:
            - switch.turn_on: relay
      - delay: 5 sec
      - switch.turn_off: relay
      - switch.turn_off: bell