Shelly
Shelly BLU Motion
- Bluetooth
Verified September 2026
The motion sensor for households without a Zigbee stick: it broadcasts open BTHome packets that Home Assistant decodes automatically via any Bluetooth adapter or ESPHome proxy — no hub, no pairing dance. That's the trade Zigbee sensors like the SONOFF SNZB-03 or Aqara motion sensor make you skip: their mesh hops room-to-room off one coordinator, while this one's Bluetooth range tops out around room-scale (roughly 10m indoors) unless you scatter proxies. At 32x42x27mm and 26g, it's compact enough for a shelf corner or door frame, sticks up with the included adhesive pad — no drilling — and adds a free lux sensor; best for single-room triggers, not whole-house coverage.
In Home Assistant
| Control | Type | What it does |
|---|---|---|
| Motion | Binary sensor | Occupancy state decoded from the BTHome advertisement; can hold a stale detected value if a clearing packet is missed, since HA never actively polls the sensor. |
| Illuminance | Sensor | Ambient light level, broadcast in the same packet as motion — usable for a combined motion-and-darkness lighting condition. |
| Battery | Sensor (%) | Updates infrequently since it's piggybacked on the same low-duty-cycle advertisement. |
| Button | Event | Single button-press event exposed separately from the motion/illuminance sensor entities. |
HA's bthome integration decodes the raw advertisement into four entities out of the box — motion, illuminance, battery, and a button-press event — with zero pairing unless the device has encryption turned on, in which case you must manually enter its bindkey during discovery, a common setup snag since it isn't surfaced clearly in Shelly's own app. Because BTHome is receive-only — HA never queries the sensor, it just listens for broadcasts — a single dropped clear packet can leave the motion entity stuck reporting detected after the room empties, a known and expected passive-BLE limitation rather than a bug. That same passive design is what makes the sub-100ms detection-to-state-change genuinely useful for automations: it beats the typical latency of a Zigbee PIR mesh hop, so it's worth reserving for a latency-sensitive trigger rather than routine background lighting.
Specs
- power
- CR2477, up to 5 years
- range
- 9 m, 120 degrees
- mounting
- Adhesive wall sticker included; no screws or bracket
- requires
- HA Bluetooth adapter, ESPHome Bluetooth proxy or Shelly gateway device
- ip rating
- Not officially IP-rated — indoor use only
- dimensions
- 32 x 42 x 27 mm, 26 g
- sensor type
- Motion (PIR) with illuminance