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Shelly

Shelly Plus Add-On

Shelly Plus Add-On

$18.96 AUD
$23.99 AUD $18.96 AUD
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Shelly Plus Add-on: Galvanically Isolated Sensor Interface

The Shelly Plus Add-on is a galvanically isolated sensor interface designed for seamless integration with Shelly Plus and Gen3 devices. It expands the functionality of Shelly controllers by adding analog, digital, and 1-Wire sensor support — ideal for applications that require precise environmental, proximity, or motion sensing.

Main Applications

  • Residential
  • MDU (Multi-Dwelling Units – apartments, condominiums, hotels, etc.)
  • Light commercial (small offices, retail stores, restaurants, gas stations, etc.)
  • Agricultural (greenhouses, nurseries, farms, ranches, etc.)
  • Government/municipal buildings
  • Universities and educational institutions

Future Integrations

  • Google
  • Amazon
  • Samsung SmartThings

Device Electrical Interfaces

Inputs

  • 1 analog input: ANALOG IN
  • 1 digital input: DIGITAL IN

Outputs

  • 1 reference voltage output: VREF OUT
  • 1 reference voltage with pull-up resistor: VREF + R1 OUT
  • 2 ground terminals: GND*

1-Wire Interface

  • 3 sensor power outputs (shared PCB track): VCC
  • 3 sensor data terminals (shared PCB track): DATA
  • 3 ground terminals (shared PCB ground): GND*

Add-on Interface

  • Shelly proprietary serial interface for connecting to compatible Shelly Plus devices

Supported Sensors

  • Up to 5x DS18B20 temperature sensors
  • Single DHT22 temperature and humidity sensor
  • NTC resistors with 10 kΩ nominal resistance, β=4000 K
  • Photoresistors
  • PIR (motion) sensors
  • Soil moisture sensors
  • Ultrasonic proximity sensors
  • Capacitive liquid level sensors
  • Sound detectors
  • Other analog sensors with 0–10 V output voltage

Specifications

Size (HxWxD): 37x42x15 ±0.5 mm / 1.46 x 1.65 x 0.59 ±0.02 in
Weight: 105 g / 3.70 oz
Shell Material: Plastic
Color: Black
Max Torque (Screw Terminals): 0.1 Nm / 0.89 lb·in
Max Conductor Size: 1 mm² / 17 AWG
Conductor Stripped Length: 4.5 mm / 0.18 in
Ambient Temperature: -20 °C to 40 °C / -5 °F to 105 °F
Humidity: 30% to 70% RH
Max Altitude: 2000 m / 6562 ft
Power Supply: 3.3 V DC (from Shelly Plus device)
Power Consumption: < 0.5 W (without sensors)
VCC Max Current: 10 mA
VREF OUT Max Current: 1 mA
VREF + R1 OUT Resistor: 10 kΩ

Supported Shelly Devices

Shelly Plus Devices

  • Shelly Plus 1 / 1PM / 1 UL / 1PM UL
  • Shelly Plus 2PM / 2PM UL
  • Shelly Plus i4 / i4DC
  • Shelly Plus 0-10V Dimmer PM
  • Shelly Plus RGBW PM

Shelly Gen3 Devices

  • Shelly 1 Gen3 / 1PM Gen3 / 2PM Gen3
  • Shelly Shutter / i4 Gen3
  • Shelly DALI Dimmer Gen3
  • Shelly Dimmer 0/1-10V PM Gen3
  • Shelly EM Gen3

Shelly Gen4 Devices

  • Shelly 1 Gen4 / 1PM Gen4 / 2PM Gen4

Measurement Capabilities

Temperature Reading: Depends on DS18B20 or DHT22 sensors
Humidity Reading: Depends on DHT22 sensor
Digital Input: -15 V to 0.5 V (True) / 2.5 V to 15 V (False)*
Analog Input Range: 0 to 100%
Analog Input Report Threshold: 1%**
Voltmeter Range: 0 to 10 V
Voltmeter Report Threshold: 0.1 V**
Accuracy: Better than ±5%

* Logic can be inverted in digital input settings.
** Thresholds can be configured in analog input/voltmeter settings.

Legend

VCC: Sensor power supply terminals
DATA: 1-Wire data terminals
GND: Ground terminals
ANALOG IN: Analog input
DIGITAL IN: Digital input
VREF OUT: Reference voltage output
VREF + R1 OUT: Reference voltage through pull-up resistor (for passive devices)

The Shelly Plus Add-on is a powerful expansion module that transforms your Shelly Plus or Gen3 devices into multi-sensor automation hubs, enabling smarter control, monitoring, and environmental awareness in residential, commercial, or agricultural applications.

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