Automate a damper vent with Shelly and ha

[peterxian]

I wrote up a summary on my damper control experience which might help:

Motorized inline HVAC damper for zone control

I’ve been using this motorized inline HVAC damper for “zone” control in my spare bedroom for over a year now, and have cited it several times as an example so I thought I might share the full implementation in case it inspires anyone. Concept The room is fed by a single HVAC duct which now has the damper installed inline. When the damper is closed, the room is cut off from the central air. When the damper is open, the room is heated/cooled along with the rest of the house. Sensors in the room …

However note the Shelly i4 is not a switch/relay itself, it’s an input detector for up to four physical switches. You likely need a Shelly 2PM or similar that has relays to control the two directions of the damper motor.