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
Type | Value |
|---|---|
Physical | |
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 |
Environmental | |
Ambient temperature: | -20 °C to 40 °C / -5 °F to 105 °F |
Humidity | 30 % to 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 circuits ratings | |
VCC max. current: | 10 mA |
VREF OUT max. current: | 1 mA |
VREF+R1 OUT resistor | 10 kΩ |
Shelly Plus device firmware capabilities | |
Shelly Plus Addon supporting devices: | Shelly Plus devices:
|
Shelly Gen3 devices:
| |
Shelly Gen4 devices:
| |
Temperature reading: | Depends on the DS18B20 or DHT22 sensors |
Humidity reading: | Depends on the 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** |
Analog input / Voltmeter accuracy | Better than ±5% |
* Logic can be inverted in the digital input settings
** Can be configured in the analog input / voltmeter settings
Legend
Terminals | External sensor pins | ||
|---|---|---|---|
VCC | Sensor power supply terminals | VCC/VDD | Sensor power supply pins |
DATA | 1-wire data terminals | DATA/DQ | Sensor data pins |
GND | Ground terminals | GND | Ground pins |
ANALOG IN | Analog input | ||
DIGITAL IN | Digital input | ||
VREF OUT | Reference voltage output | ||
VREF+R1 OUT | Reference voltage through a pull-up resistor* output | ||
*For passive devices that need it to form a voltage divider. |
What are the differences between the different generations of Shelly products?
Each new generation adds more power, memory, and features:
Gen 1 offers basic control;
Gen 2 (Plus Series, Mini Series, Pro Series) adds Bluetooth, scripting, and better security;
Gen 3 improves performance, adds Matter (starting from firmware version 1.6.0 or newer) and advanced monitoring;
Gen 4 offers multi-protocol connectivity, featuring Wi-Fi 6, Bluetooth, Zigbee, and Matter.
Can I control the device via Bluetooth?
No, the protocol is used only for device inclusion, allowing for quick and easy setup through the Shelly Smart Control app.
For bluetooth control it is required to have another Bluetooth device such as Shelly BLU Button or Shelly BLU Motion to interact.
Additionally, Shelly devices can function as a BLE gateway, bridging Shelly BLU devices to your Wi-Fi network.
Is it possible to use the device without a hub?
Yes, Shelly devices (except for Wave devices) operate independently without the need for a hub. They connect directly to your Wi-Fi network, and you can control them via the Shelly Smart Control app, web interface, or through integrations with platforms like Google Home, Alexa, Home Assistant and Samsung SmartThings.