Shelly Plus Add-On

The Shelly Plus Add-on is a galvanically isolated sensor interface for all Shelly Plus relays. Use it to measure temperature and humidity using its 1-wire terminals, or connect different analog and digital sensors for complex automation and greater efficiency.
Can be used with up to five DS18B20 sensors or one DHT22 sensor
It has an analog and a digital input
DS18B20 - Temperature sensor (up to 5);
DHT22 sensor - if you want to monitor temperature and humidity

Size (HxWxD): 37x42x15 ±0.5 mm / 1.46 x 1.65 x 0.59 ±0.02 in
Weight: 105 g / 3.70 oz
Case material: plastic
Color black
Ambient temperature: -20 °C up to 40 °C / -5 °F to 105 °F
Humidity 30 % to 70 % RH
Max. altitude 2000 m / 6562 ft
AC supply voltage: N/A
DC supply voltage: 3.3 V (from Shelly plus device)
Power consumption: < 0.5 W (without sensors)
Output circuit ratings
VCC max . current: 10 mA
VREF OUT max. current: 1 mA
FIRMWARE CAPABILITIES OF SHELLY PLUS DEVICES
Compatible Shelly Plus Addon devices: Shelly Plus 1/1PM, Shelly Plus 2PM, Shelly Plus i4/i4DC
Temperature reading: Dependent on DS18B20 or DHT22 sensors
Humidity reading: Dependent 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 Ratio Threshold: 1%**
Voltmeter Range: 0 to 10 V
Voltmeter reporting threshold: 0.1 V