Shelly Plus Add-On Isolated Sensor Interface for all Shelly Plus Relays

Galvanically isolated sensor interface for all Shelly Plus relays. Use it to measure temperature and humidity or connect various analog and digital sensors. Also compatible with most Arduino sensors!

Device identification
Device name: Shelly Plus Add-on

Short description
Shelly Plus Add-on (the Device) is a galvanically isolated sensor interface to the Shelly Plus and Gen3 devices.

Main applications

• Residential

• MDU (Multi Dwelling Units - apartments, condominiums, hotels, etc.)

• Light commercial (small office buildings, small retail/restaurant/gas station, etc.)

• Agricultural (greenhouses, hotbed, nurseries, ranches, etc. )

• Government/municipal

• University/college

Future integrations

• Google

• Amazon

• Samsung SmartThings

Device electrical interfaces
Inputs

• 1 analog input: ANALOG IN

• 1 digital input: DIGITAL IN

Output

• 1 reference voltage output: VREF OUT

• 1 reference voltage through a pull-up resistor output: VREF + R1 OUT

• 2 ground terminals: GND*

1-Wire interface

• 3 sensor power supply outputs (connected to the same PCB track): VCC

• 3 sensor data terminals (connected to the same PCB track): DATA

• 3 ground terminals: GND*

• Connected to the same PCB ground layer.

Add-on interface

Shelly proprietary serial interface to connect to a Shelly Plus device

Supported sensors

• Up to 5 DS18B20

• Single DHT22

• NTC resistors with 10 kΩ nominal resistance and β=4000 K

• Photoresistors

• PIR sensors

• Soil moisture sensors

• Ultrasonic proximity sensors

• Capacitive liquid level sensors

• Sound detectors

• Other analog sensors with 0 to 10 V output voltage

Specifications:

• Size (HxWxD):37x42x15 ±0.5 mm / 1.46 x 1.65 x 0.59 ±0.02 in

• Weigh:105 g / 3.70 oz

• Shell material: Plastic

• Screw terminals max torque: 0.1 Nm / 0.89 lbIn

• Conductor cross section: max. 1 mm² / 17 AWG

• Conductor stripped length: 4.5 mm / 0.18 in

• Color: Black

• 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 voltage AC: N/A

• Power supply voltage DC: 3.3 V (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