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.

Adding Video to Audio Intercom. : r/HomeKit

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

Make a dumb doorbell smart with Shelly 1 - #102 by arganto - Share your Projects! - Home Assistant Community

Hardwired power to a Smartthings button : r/homeautomation

Make a dumb doorbell smart with Shelly 1 - #39 by janser01 - Share your Projects! - Home Assistant Community

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