This ESPHome based doorbell is a modified Wemos Relay Shield for D1 Mini with an integrated buck converter to power the Wemos without the need of an external power source.
The doorbell has 3 connectors to make a “dumb” classic doorbell smart:
- Power in: here goes the power from the doorbell transformator (AC/DC 40 volts max)
- Doorbell: here goes the doorbell
- Switch: here goes the push button placed at the door
You can buy the case as extra option, or download it and print it yourself: