Shelly
Shelly Pro Sensor Add-on
Shelly Pro Sensor Add-on
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Shelly Pro Sensor Add-on – Advanced Sensor Connectivity for Smart Automation
Transform your compatible Shelly Pro device into a powerful multi-sensor hub with the Shelly Pro Sensor Add-on. Designed for smart homes, commercial buildings and industrial automation, this galvanically isolated expansion module enables real-time environmental monitoring, sensor integration and intelligent automation directly from your DIN rail installation.
Featuring two independent 1-Wire interfaces, two 0–10V analogue inputs, two digital inputs and one potential-free solid-state relay output, the Shelly Pro Sensor Add-on provides flexible connectivity for temperature, humidity, motion, water detection, lighting, pressure and other compatible sensors.
Whether you're improving HVAC efficiency, protecting equipment, automating irrigation or creating a customised monitoring system, the Shelly Pro Sensor Add-on expands what your Shelly Pro installation can achieve.
Key Features & Benefits
- Expand Shelly Pro Functionality: Add advanced sensor monitoring and automation capabilities to selected Shelly Pro devices.
- Galvanic Isolation: Electrical isolation helps deliver safe, reliable sensor integration.
- Dual 1-Wire Interfaces: Connect up to five DS18B20 temperature sensors per channel or compatible temperature and humidity sensors.
- Two 0–10V Analogue Inputs: Connect suitable CO₂, pressure, light, moisture and other analogue sensors.
- Two Digital Inputs: Integrate compatible switches, motion detectors, leak sensors and other digital devices.
- Potential-Free Relay Output: One solid-state output for signalling external circuits, alarms and compatible control equipment.
- Arduino Sensor Compatibility: Supports a wide range of compatible Arduino-style sensors for customised projects.
- Compact DIN Rail Design: Suitable for installation in residential, commercial and industrial electrical panels.
- Configurable Monitoring: Adjustable analogue reporting thresholds and digital input logic settings.
- Low Power Consumption: Consumes less than 0.5W without connected sensors.
Why Choose the Shelly Pro Sensor Add-on?
The Shelly Pro Sensor Add-on extends your existing Shelly Pro automation system with additional monitoring and control possibilities. Rather than installing separate controllers for every sensor, compatible sensor signals can be integrated through a single expansion module connected to a supported Shelly Pro host.
This makes it ideal for building smarter energy management systems, improving environmental monitoring and creating responsive automation based on real-world conditions.
Smart Automation Applications
1. Temperature & Humidity Monitoring
Monitor critical environmental conditions using compatible DS18B20 temperature sensors or DHT22 temperature and humidity sensors. Suitable for electrical cabinets, server rooms, greenhouses, equipment enclosures and temperature-sensitive areas.
2. HVAC & Energy Efficiency
Connect compatible temperature, humidity, CO₂ or pressure sensors to monitor environmental conditions and build automations that help optimise heating, cooling and ventilation. Use sensor readings to support more efficient building operation.
3. Motion-Activated Lighting
Connect a compatible PIR motion sensor to detect activity and trigger lighting automations through your Shelly system. Ideal for hallways, storage areas, offices and utility rooms where lights should operate only when needed.
4. Water Leak & Environmental Protection
Integrate compatible water leak, rain or environmental sensors to monitor potential hazards. Create automated alerts or trigger connected equipment when predefined sensor conditions are detected.
5. Smart Irrigation & Garden Automation
Use compatible soil moisture sensors to monitor ground conditions and automate irrigation equipment. Integrate environmental monitoring to reduce unnecessary watering and improve outdoor automation.
6. Industrial & Custom Monitoring
Connect compatible analogue and digital sensors for equipment monitoring, liquid level detection, pressure measurement and specialised automation projects. Ideal for advanced DIY installations and professional control systems.
Supported Sensors
The Shelly Pro Sensor Add-on supports a wide range of compatible sensors, including:
- DS18B20 temperature sensors – up to five per 1-Wire channel
- DHT22 temperature and humidity sensors
- NTC thermistors – 10kΩ nominal resistance, β = 4000K
- Photoresistors and compatible light sensors
- PIR motion detection sensors
- Soil moisture sensors
- Ultrasonic proximity sensors
- Capacitive liquid level sensors
- Compatible sound detection sensors
- Other compatible analogue sensors with 0–10V outputs
Note: Sensor compatibility depends on electrical characteristics, wiring and supported firmware functionality. Not all Arduino sensors are directly interchangeable or plug-and-play.
Compatible Shelly Pro Devices
The Shelly Pro Sensor Add-on is designed for use with the following Shelly devices:
- Shelly Pro 1
- Shelly Pro 1PM
- Shelly Pro 2
- Shelly Pro 2PM
- Shelly Pro 3EM
- Shelly Pro Dimmer 0/1–10V PM
- Shelly Pro Dimmer 1PM
- Shelly Pro Dimmer 2PM
- Shelly Pro EM-50
Important: A compatible Shelly Pro host device running firmware version 2.0 or later is required. The Sensor Add-on is not a standalone device and receives its power through the connected host device.
Electrical Interfaces & Connections
- Analogue Inputs: 2 × 0–10V
- Digital Inputs: 2 × ±15V
- 1-Wire Interfaces: 2 independent DATA terminals
- Relay Output: 1 potential-free solid-state output
- Ground Connections: 2 × GND
- Reference Connections: 1 × VREF and 1 × VREF + R1
- Sensor Power: 1 × VCC
- Host Connection: Shelly proprietary serial expansion interface
Technical Specifications
| Specification | Details |
|---|---|
| Physical Specifications | |
| Dimensions (H × W × D) | 94 × 19 × 69 mm |
| Weight | 45 g |
| Mounting | DIN Rail |
| Conductor Cross Section | 0.2–0.5 mm² (24–20 AWG) |
| Wire Stripping Length | 5–8 mm |
| Housing Material | Plastic |
| Housing Colour | Black |
| Environmental Specifications | |
| Operating Temperature | -20°C to +40°C |
| Operating Humidity | 30%–70% RH |
| Maximum Altitude | 2000 m |
| Electrical Specifications | |
| Power Supply | 12V DC from compatible Shelly host |
| Power Consumption | Less than 0.5W (without sensors) |
| Digital Input True | -15V to 0.5V |
| Digital Input False | 2.5V to 15V |
| Analogue Input Range | 0–100% |
| Analogue Reporting Threshold | 1% (configurable) |
| Voltmeter Range | 0–10V |
| Voltmeter Reporting Threshold | 0.1V (configurable) |
| Analogue/Voltmeter Accuracy | Better than ±5% |
| Output Ratings | |
| VCC Maximum Current | 10 mA |
| VREF Maximum Current | 2 mA |
| VREF + R1 Resistance | 10 kΩ |
| Maximum Switching Voltage | 30V |
| Maximum Switching Current | 300 mA |
| Controller | |
| Microcontroller | STM32G071GBU6 |
| Temperature Accuracy | Depends on connected sensor |
| Humidity Accuracy | Depends on connected sensor |
Frequently Asked Questions
What does the Shelly Pro Sensor Add-on do?
It expands compatible Shelly Pro devices with additional sensor inputs and a potential-free solid-state output, allowing you to monitor environmental conditions and build more advanced automations.
Can the Shelly Pro Sensor Add-on operate independently?
No. It must be connected to a compatible Shelly Pro host device, which provides power and manages the add-on functionality.
How many temperature sensors can I connect?
The add-on has two independent 1-Wire channels, each supporting up to five compatible DS18B20 temperature sensors, allowing up to ten DS18B20 sensors in total.
Can I connect a CO₂ or pressure sensor?
Yes. Compatible sensors with a suitable 0–10V analogue output can be connected to the two analogue input terminals, provided their power and electrical requirements are met.
Can I use the Shelly Pro Sensor Add-on with Arduino sensors?
Many Arduino-compatible sensors may be used where their interfaces, voltage requirements and signals are supported. Always check the sensor specifications before connecting.
Can I use the Shelly Pro Sensor Add-on with Home Assistant?
Sensor data exposed by a compatible Shelly Pro host may be available through supported Shelly integrations, including Home Assistant. The available entities depend on the host device, firmware and connected sensor configuration.
Does the Shelly Pro Sensor Add-on work with Alexa, Google Home or SmartThings?
The add-on does not provide standalone Alexa, Google Home or SmartThings capabilities. Integration possibilities depend on the connected Shelly Pro host and supported services.
What firmware version is required?
The compatible Shelly Pro host device must run firmware version 2.0 or later to support the Pro Sensor Add-on.
Is professional installation recommended?
Yes. Where installation involves an electrical switchboard or fixed electrical wiring, work must be carried out by an appropriately licensed electrician in accordance with applicable Australian regulations.
Take Your Shelly Pro Automation Further
Expand your smart home or professional automation system with the Shelly Pro Sensor Add-on. From temperature monitoring and HVAC optimisation to intelligent lighting, irrigation and equipment protection, this compact expansion module provides versatile sensor connectivity for your Shelly Pro installation.
Shop the Shelly Pro Sensor Add-on at Oz Smart Things and build a smarter, more connected automation system.
Installation note: A compatible Shelly Pro host device is required and sold separately unless otherwise specified. Connected sensors may also be sold separately. Verify sensor electrical requirements and output ratings before installation.
