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Shelly Plus Add-On - I/O expansion for Shelly modules
Shelly Plus Add-On is an add-on for Shelly Plus series modules, such as Shelly Plus 1/1PM, Shelly Plus 2PM, Shelly Plus i4/i4DC, which expands them with additional I/O ports . You can connect Arduino-compatible modules such as DS18B20 or DHT22 temperature sensors, photoresistors, soil moisture, distance, motion sensors, reed switches and much more to the Shelly Plus Add-On I/O pins. It has three digital inputs and one analog output , as well as a VREF and VREF + R1 output with a pulled-up resistor. The module is powered directly from the Shelly Plus controller.
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