Make a dumb doorbell smart with Shelly 1 - Share your Projects

Where you already able to connect it? Otherwise you can connect the cables according to how they are connected to your transformer. See this post 34 for more details. You should be able to use the way Rubueno describes the wiring.

31 DIY Alexa Connected Smart Doorbell, Add Dumb Doorbell to Home Assistant

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Make a dumb doorbell smart with Shelly 1 - #125 by capsel22 - Share your Projects! - Home Assistant Community

Home Assistant, Hi team

Help making wired dumb doorbell smart with Shelly 1 : r/homeautomation

Making a doorbell smart using a Shelly 1 and Home Assistant

Help making wired dumb doorbell smart with Shelly 1 : r/homeautomation

Make a dumb doorbell smart with Shelly 1 - #82 by pabu - Share your Projects! - Home Assistant Community

Making a doorbell smart using a Shelly 1 and Home Assistant

Shelly support group (English Version), Preview from next update.