Information

This doorbell is the successor of the previous version doorbell v2.0. It is 100% assembled and has now an ESP32 (ESP32-WROOM-32E) onboard.

The doorbell has 3 connectors to make a “dumb” classic doorbell smart:

1. Power: here goes the power from the doorbell transformator (AC/DC 40 volts max)
2. Bell: here goes the doorbell (the input power goes via the relay to this connector)
3. Switch: here goes the push button placed at the door (note: the push button cannot contain light)

The Case

The case can be downloaded from Printables if you wish to print it yourself.

Technical information

There’s a new version of the doorbell, same form factor, but a small change in configuration.

1st edition

This is the version sold until around end 2023, begin 2024. This version has no led’s onboard

These are the used GPIO’s:

• GPIO4: switch input, active pulled up and not inverted. Directly connected to the switch connector and triggered via connection to ground.
• GPIO5: relay output

Full config is on GitHub

2nd edition

This is the current version, recognizable due of two led’s. One for power and one for the relay status.

These are the used GPIO’s:

• GPIO4: switch input, active pulled up. Controlled via a transistor, which is controlled through the switch connector (5v and ground).
• GPIO5: relay output

Full config is on GitHub

The config difference

The 1st version had an inverted trigger on GPIO4:

binary_sensor:
  - platform: gpio
    pin:
      number: GPIO4
      mode: INPUT_PULLUP
      inverted: true

The 2nd version has an non-inverted trigger on GPIO4:

binary_sensor:
  - platform: gpio
    pin:
      number: GPIO4
      mode: INPUT_PULLUP
      inverted: false

Support page

For flashing or more details, click here.