Shelly Plus Add-On

Device identification

Name: Shelly Plus Add-on

Short description

Shelly Plus Add-on is a galvanically isolated sensor interface designed for use with Shelly Plus and Gen3 devices.
It enables integration of various analog and digital sensors for advanced automation and environmental monitoring applications.

Main applications

• Residential
• MDU (apartments, condominiums, hotels)
• Light commercial (offices, retail, restaurants, gas stations)
• Agricultural (greenhouses, nurseries, ranches)
• Government / municipal buildings
• University / college facilities

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 supply outputs (VCC – same PCB track)

• 3 sensor data terminals (DATA – same PCB track)

• 3 ground terminals (GND – common ground layer)

Add-on interface:

Shelly proprietary serial interface to connect with a Shelly Plus device

Supported sensors

• Up to 5 × DS18B20 temperature sensors
• 1 × DHT22 sensor
• NTC resistors (10 kΩ nominal, 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

*All GND terminals are internally connected to the same PCB ground layer.

Physical

Size (HxWxD): 37×42×15 ±0.5 mm / 1.46×1.65×0.59 ±0.02 in

Weight: 105 g / 3.70 oz

Shell material: Plastic

Screw terminals torque: 0.1 Nm (0.89 lbf·in)

Conductor size: max. 1 mm² (17 AWG)

Strip length: 4.5 mm (0.18 in)

Color: Black

Environmental

Ambient temperature: −20 °C to 40 °C (−5 °F to 105 °F)

Humidity: 30–70% RH

Max altitude: 2000 m (6562 ft)

Electrical

Power supply voltage AC: N/A

Power supply voltage DC: 3.3 V (from Shelly Plus device)

Power consumption: < 0.5 W (without sensors)

Output ratings

VCC max current: 10 mA

VREF OUT max current: 1 mA

VREF+R1 OUT resistor: 10 kΩ

Shelly Plus device firmware capabilities

Supported devices:

Shelly Plus devices: Shelly Plus 1, Shelly Plus 1PM, Shelly Plus 1 UL, Shelly Plus 1PM UL, Shelly Plus 2PM, Shelly Plus 2PM UL, Shelly Plus i4, Shelly Plus i4DC, Shelly Plus 0–10V Dimmer PM, Shelly Plus RGBW PM

Shelly Gen3 devices: Shelly 1 Gen3, Shelly 1PM Gen3, Shelly 2PM Gen3, Shelly Shutter, Shelly i4 Gen3, Shelly DALI Dimmer Gen3, Shelly Dimmer 0/1–10V PM Gen3, Shelly EM Gen3

Shelly Gen4 devices: Shelly 1 Gen4, Shelly 1PM Gen4, Shelly 2PM Gen4

Sensor support

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: 0–100%

Analog input report threshold: 1%**

Voltmeter range: 0–10 V

Voltmeter report threshold: 0.1 V**

Analog input / Voltmeter accuracy: Better than ±5%