Shelly BLU Distance

What is Shelly BLU Distance?

Smart Bluetooth ultrasonic sensor that measures distance to various surfaces, including liquids.

Ultrasonic Distance Measurement up to 5m
Bluetooth Low Energy (BLE 5.0)
Liquid level monitoring
Obstacle detection
Protection class: IP64
Compact and portable design
Long battery life (up to 4 years)

Compatible gateways are Shelly BLU Gateway or Shelly Plus, Gen3, Gen4 or Pro device.

VIEW SPECIFICATIONS SHELLY MOBILE APP

Features

Ultrasonic Measurement

Detects distance and liquid levels using ultrasonic waves for high precision

Bluetooth Connectivity

Works via BLE 5.0 (Bluetooth Low Energy)

Adjustable Measurement Intervals

Customize how often the device takes measurements to fit your needs

Three built-in modes

Liquid, Solids, and Occupancy

Compact & Easy to Install

Slim and portable design mounts in a 36 mm hole-no complex setup required

App Control

Monitor and configure the device through the Shelly Smart Control app or other Bluetooth-compatible platforms

Use Cases

Smart Water Tank Monitoring

Keep track of your water usage without lifting the lid or checking manually.
Install Shelly BLU Distance Sensor on your rainwater collection or household storage tank to monitor water levels in real time. The sensor sends updates via Bluetooth to your Shelly Smart Control App, allowing you to:

Get notified when the tank is nearly empty or full.
Automate water pumps using other Shelly relays.
Optimize water usage without running cables.

Smart Septic Tank Monitoring

Avoid messy surprises and costly overflows by keeping tabs on your septic tank – easily.
Mount the Shelly BLU Distance Sensor on the inside of the tank lid, pointing down toward the liquid surface, to continuously measure the fill level in real time. The sensor connects via Bluetooth to the Shelly Smart Control App, giving you instant visibility and alerts without opening the tank or running cables.

With Shelly BLU Distance Sensor, you can:

Get notified before your tank reaches critical levels.
Automate pumps or alarms using other Shelly relays and devices.
Monitor efficiently and safely without manual inspections or wiring.
Stay ahead of maintenance and protect your septic system – all from your phone.

Garage or Driveway Vehicle Detection

Let your smart home know when your car has arrived or left.

Place the Shelly BLU Distance Sensor on your garage ceiling or driveway entrance. It detects the presence of your vehicle and sends signals to automate:

Opening the garage door via Shelly relays.
Turning on driveway or garage lights.
Sending you alerts when someone parks in your spot.

Stockroom Level or Space Monitoring

Manage tight spaces and restock timing without being there.

Install the sensor in a small supply or stockroom to measure the distance to products or goods. Use it to:

Know when supply bins are low (e.g., cups, bags, ingredients).
Monitor space availability in fridges, cabinets, or shelves.
Send alerts to refill or reorder on time-without daily checks.

How-To Guides

Caution

Installation of certain Shelly devices must be done by a qualified electrician or authorised installer.

User interface

Inputs:

Push button:

- Single press: Reset the timer between measurements.
- Press 4 times: Enter pairing mode for 60 seconds.
- Press and hold for 30 seconds: Factory reset (only possible shortly after inserting the battery).

Outputs:

LED indication:

- LED flashes once on button press to show that the Device has accepted the user command and will immediately measure and broadcast the data.
- LED flashes fast after pressing the button 4 times to indicate pairing mode.
- LED flashes superfast on successful BLE/BT pairing for 5 seconds.

Specifications

Mechanical
Size (HxWxD)	Without casing: Size (LxD) 115.20 mm / 4.53 in ±0.5 mm (length) x 33.3 mm / 1.31 in ±0.5 mm (diameter) With casing: Size (LxD) 117.90 mm / 4.64 in ±0.5 mm (length) x 35.30 mm / 1.39 in ±0.5 mm (diameter) The device, along with the casing, must be mounted in a hole with a minimum diameter of 36.00 mm.
Weight	114g (with the battery)
Shell material	Plastic
Color	White
Environmental
Ambient temperature	-20 °C to 40 °C / -5 °F to 105 °F
Humidity	30% to 75% RH
Degree of protection	IP64
Electrical
Power supply	1x 3.6 V LISOC 14505 2700mAh battery
Battery life	Up to 4 years
Ultrasonic sensor
Measurement range	200 mm - 5000 mm
Accuracy	from 20 cm to 200 cm : +/- 2cm above 200 cm: +/- 1%
Connectivity
Bluetooth:	Yes
Bluetooth Protocol:	5
Bluetooth RF band:	2402 - 2480 MHz
Bluetooth Max. RF power	<20 dBm
Bluetooth Range	Up to 10 m / 33 ft indoors, 30 m / 100 ft outdoors (dependent on local conditions)
Microcontroller Unit
CPU:	Silicon Labs - EFR32MG27C140F768IM32
Clock frequency:	38.4 Mhz
RAM:	64 kB
Flash:	768 kB
Firmware Capabilities
Encryption:	AES encryption (CCM mode)
Additional Features
Accelerometer	Yes
Measure interval	Valid range = 5 seconds to 300 seconds. Default - 30 seconds
Measurement ranges (7 types)	Range 1 - Close (200mm-450mm) Range 2 - Mid (300mm - 3500mm) Range 3 - Close and Mid (200mm - 3500mm) Range 4 - Far (2500mm - 5000mm) Range 5 - Close (200mm-450mm) and Far (2500mm - 5000mm) Range 6 - Mid and Far (300mm - 5000mm) Range 7- Full range (200 mm - 5000 mm)