Shelly PLUS Add-on

Shelly Plus Add-on – a galvanically isolated sensor interface module for use with Shelly Plus, Gen3 and Gen4 devices; adds analog, digital input channels and 1-Wire sensor connectivity for advanced automation.

Features

• 1 analog input (ANALOG IN)
• 1 digital input (DIGITAL IN)
• 1 reference voltage output (VREF OUT) and one VREF + R1 OUT with pull-up resistor
• 2 ground (GND) terminals
• 1-Wire interface: 3× VCC, 3× DATA, 3× GND terminals
• Supports up to 5 DS18B20 temperature sensors or 1 DHT22 (temperature + humidity)
• Supports analog sensors (0–10 V), NTC resistors, photoresistors, PIR, soil moisture, ultrasonic, liquid level, sound detectors

Primary Uses

• Temperature and humidity sensing (e.g., aquarium, room)
• Motion or light-based control (PIR, photoresistors)
• Soil moisture or level monitoring in gardening
• Monitoring door or garage door state via reed switches
• I/O expansion for automation scenarios with Shelly Plus devices

Compatibility

• Works with Shelly Plus, Gen3, and Gen4 devices
• Compatible sensor types: DS18B20, DHT22, analog and digital sensors
• Supports automation and voice ecosystems (Alexa, Google, SmartThings, etc.)

• Datasheet