Shelly
Shelly Plus Uni
- Wi-Fi
- Bluetooth
Verified September 2026
The odd-jobs module: two low-voltage inputs and two potential-free relay outputs (30V, 300mA max) for wiring into garage door openers, boiler interlocks, doorbell chimes, underfloor heating actuators, or any low-voltage circuit a mains relay can't touch. Don't mistake this for a parasitically-powered add-on — at 40 x 21 x 7mm it's tiny enough to tuck inside a garage opener's housing, but it still needs its own 8-24V AC/9-28V DC (or 5V DC) supply wired in separately from whatever low-voltage circuit it's monitoring or switching. Fully local via HA's core Shelly integration — the one to keep in a drawer for whatever project comes next.
In Home Assistant
| Control | Type | What it does |
|---|---|---|
| Relay 1 | Switch | Potential-free relay output; momentary/pulse mode wires directly into a garage opener's push-button terminals to simulate a button press. |
| Relay 2 | Switch | Second independent potential-free relay, e.g. for a boiler interlock or doorbell chime circuit. |
| Input 1 | Binary sensor / analog sensor | Low-voltage input configurable as a digital contact or an analog voltage reading. |
| Input 2 | Binary sensor / analog sensor | Second low-voltage input, independently configurable as digital or analog; commonly paired with Input 1 for two-sensor setups like separate open and closed reed switches. |
| Garage door cover | Cover (template) | Not exposed natively — built in HA by pairing a relay switch (pulse trigger) with an input binary sensor (reed switch) via a template cover. |
Each relay and each input surfaces as its own entity in HA — two independent switch entities for the outputs, two independent binary sensor entities for the inputs — and either input can be reconfigured in the Shelly app as a dry-contact digital sensor or an analog voltage channel, useful for reading a resistive or voltage-output sensor instead of a switch closure. The Uni has no native cover entity, so a garage door setup means hand-building a template cover: the relay switch fires a momentary pulse into the opener's existing button-press terminals while a reed switch on the other input feeds the binary sensor for open/closed state. A recurring gotcha is Shelly's own input-to-relay auto-off linkage — leaving an input still associated with its paired relay in the device's local settings can make the binary sensor's state get silently overwritten when the relay times out, so the input needs to be detached from relay control before it holds accurate door-position state in HA.
Specs
- inputs
- 2
- weight
- 8.5g with cables
- channels
- 2
- use case
- low-voltage relay/input, e.g. garage doors, boiler interlocks
- dimensions
- 40 x 21 x 7mm (±0.5mm)
- output type
- potential-free (dry contact) solid-state relay
- power supply
- 8-24V AC / 9-28V DC, or 5V DC (stabilized) — a separate supply from the low-voltage circuit it's controlling or reading
- max switching
- 30V, 300mA per relay
- operating temp
- -20°C to 40°C
- neutral required
- false
- power consumption
- under 1W