Shelly Pro Sensor Add-on – Sensor control adapter for Shelly Pro relays, for connecting sensors

The Shelly Pro Sensor Add-on is a DIN rail-mounted expansion module for compatible Shelly Pro devices. It connects directly to the Shelly Pro unit and enables integration of various analog, digital, and 1-Wire sensors.

The module provides two independent 1-Wire data channels, two 0–10V analog inputs, two digital inputs, and one dry contact solid-state relay output. It can be used with DS18B20 temperature sensors, DHT22 temperature and humidity sensors, CO₂ sensors, pressure sensors, light sensors, liquid level sensors, PIR sensors, reed switches, and other compatible devices.

Galvanic isolation improves operational safety and reduces the effect of external electrical interference. The module is well suited for custom HVAC systems, building management, energy monitoring, irrigation control, liquid level monitoring, and industrial automation projects.

The Shelly Pro Sensor Add-on is not a standalone device. It can only be used together with a compatible Shelly Pro device.

About Shelly

Shelly is one of the most recognized smart home brands supporting open integrations, offering Wi-Fi, Bluetooth, Zigbee, Matter, and Ethernet-based devices. Shelly products are especially popular among Home Assistant, Node-RED, openHAB, Loxone, and professional automation users.

Key Features

• Sensor expansion for compatible Shelly Pro devices
• Galvanic isolation for safer and more reliable operation
• Two independent 1-Wire channels for DS18B20, DHT22, and compatible sensors
• Two 0–10V analog inputs for industrial and building automation sensors
• Two digital inputs for switches, reed relays, leak sensors, and motion sensors
• Dry contact solid-state relay output for external control circuits
• Arduino compatibility for DIY and custom development projects
• DIN rail-mounted design for electrical cabinets and professional installations

Electrical Specifications

• Power supply: 12V DC from a compatible Shelly Pro device
• Power consumption: < 0.5W without connected sensors
• Analog inputs: 2 × 0–10V
• Digital inputs: 2 × ±15V
• 1-Wire interfaces: 2 independent data channels
• Dry contact solid-state relay output: 1
• Maximum switching voltage: 30V
• Maximum switching current: 300mA
• VCC auxiliary output: maximum 10mA
• VREF reference voltage: maximum 2mA
• VREF+R1: 10kΩ reference resistor

Smart Home Protocols and Platform Compatibility

• Shelly Pro integration: Only compatible with supported Shelly Pro devices
• Home Assistant: Sensor data is available through the connected Shelly Pro device
• MQTT: Sensor data can be published by the compatible Shelly Pro device
• REST API and RPC: Measured values can be accessed through local APIs
• Webhooks: HTTP calls can be triggered based on sensor values
• Node-RED, openHAB, and Loxone integration through Shelly Pro devices
• Cloud-free operation on the local network

Smart Functions

• Temperature and humidity monitoring
• CO₂ and air quality monitoring
• Motion-based automations
• Water leak and liquid level monitoring
• Soil moisture-based irrigation control
• Lighting control based on brightness or motion
• Alarm and notification functions
• Complex local automations using scripting
• Local and cloud operation depending on the connected Shelly Pro device

Technical Specifications

• Product type: Sensor expansion module for Shelly Pro series devices
• Compatible Shelly devices: Shelly Pro 1, Pro 1PM, Pro 2, Pro 2PM, Pro 3EM, Pro EM-50, Pro Dimmer 0/1-10V PM, Pro Dimmer 1PM, Pro Dimmer 2PM
• Communication with main unit: Shelly proprietary serial interface
• Design: DIN rail-mounted
• Dimensions: 94 × 19 × 69 mm
• Weight: 45 g
• Housing material: Plastic
• Color: Black
• Operating temperature: -20°C to +40°C
• Humidity: 30–70% RH
• Maximum installation altitude: 2000 m
• Power supply: 12V DC from compatible Shelly Pro device
• Power consumption: < 0.5W without connected sensors
• Galvanic isolation: Yes
• 1-Wire interfaces: 2 independent DATA channels
• DS18B20 support: Up to 5 sensors per channel, up to 10 sensors total
• DHT22 support: Temperature and humidity sensors supported
• Analog inputs: 2 × 0–10V
• Analog input accuracy: ±5%
• Voltage measurement range: 0–10V
• Voltage measurement threshold: 0.1V, adjustable
• Digital inputs: 2 × ±15V
• Digital input logic levels: -15V to 0.5V = active, 2.5V to 15V = inactive, invertible
• Dry contact solid-state relay output: 1
• Maximum switching voltage: 30V
• Maximum switching current: 300mA
• VCC auxiliary output: max. 10mA
• VREF reference voltage output: max. 2mA
• VREF+R1 resistor: 10kΩ
• Microcontroller: STM32G071GBU6
• Supported sensors: DS18B20, DHT22, NTC 10kΩ, photoresistor, PIR motion sensor, soil moisture sensor, ultrasonic distance sensor, capacitive liquid level sensor, sound sensor, and any analog sensor with 0–10V output

At the link below, you can access our sales support materials for individual products.
Available documents are organized by manufacturer in folders on Google Drive.

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