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

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.

Making a doorbell smart using a Shelly 1 and Home Assistant

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Making a doorbell smart using a Shelly 1 and Home Assistant

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

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Making a doorbell smart using a Shelly 1 and Home Assistant