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.
Make a dumb doorbell smart with Shelly 1 - #102 by arganto - Share your Projects! - Home Assistant Community
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Make a dumb doorbell smart with Shelly 1 - #147 by fleeman - Share your Projects! - Home Assistant Community
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Help making wired dumb doorbell smart with Shelly 1 : r/homeautomation
Make a dumb doorbell smart with Shelly 1 - Share your Projects! - Home Assistant Community
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