---
product_id: 520655680
title: "Plus Add-On | Add-On for Shelly Plus & Gen3 Devices | Temperature and Humidity Sensor Interface | Home Automation | DS18B20, DHT22 & Arduino Sensors | Analog and Digital Input | No Hub Required"
brand: "shelly"
price: "$49.13"
currency: USD
in_stock: true
reviews_count: 10
category: "Shelly"
url: https://www.desertcart.us/products/520655680-plus-add-on-add-on-for-shelly-plus-and-gen3
store_origin: US
region: United States of America
---

# 3.3V DC powered, no batteries Analog & digital inputs Up to 5 DS18B20 sensors Plus Add-On | Add-On for Shelly Plus & Gen3 Devices | Temperature and Humidity Sensor Interface | Home Automation | DS18B20, DHT22 & Arduino Sensors | Analog and Digital Input | No Hub Required

**Brand:** shelly
**Price:** $49.13
**Availability:** ✅ In Stock

## Summary

> 🌟 Elevate your smart home with precision sensing—because your space deserves the best!

## Quick Answers

- **What is this?** Plus Add-On | Add-On for Shelly Plus & Gen3 Devices | Temperature and Humidity Sensor Interface | Home Automation | DS18B20, DHT22 & Arduino Sensors | Analog and Digital Input | No Hub Required by shelly
- **How much does it cost?** $49.13 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/520655680-plus-add-on-add-on-for-shelly-plus-and-gen3)

## Best For

- shelly enthusiasts

## Why This Product

- Trusted shelly brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug & Play Power:** Runs on 3.3V DC from your Shelly Plus or Gen3 device—no extra batteries or hubs needed.
- • **Compact Installation:** Sleek design fits inside standard electrical boxes, blending seamlessly with your smart home setup.
- • **Multi-Sensor Mastery:** Connect up to five DS18B20 or one DHT22 sensor for pinpoint temperature & humidity insights.
- • **Smart Scheduling & Automation:** Create custom timers and scenes per channel to automate your home like a pro.
- • **Universal Sensor Compatibility:** Supports analog & digital inputs—think PIR, soil moisture, photoresistors—for total environment control.

## Overview

The Shelly Plus Add-On is a compact, versatile sensor interface designed for Shelly Plus and Gen3 devices. It supports up to five DS18B20 temperature sensors or one DHT22 humidity sensor, plus analog and digital inputs for a wide range of sensors. Powered by 3.3V DC from the host device, it requires no batteries or hub, enabling easy installation inside standard electrical boxes. With scheduling and automation features, it empowers professional-grade home environment monitoring and control.

## Description

Free delivery and returns on all eligible orders. Shop Shelly Plus Add-On | Add-On for Shelly Plus & Gen3 Devices | Temperature and Humidity Sensor Interface | Home Automation | DS18B20, DHT22 & Arduino Sensors | Analog and Digital Input | No Hub Required.

Review: Great Add on to a Shelly one. - Fantastic add on to a Shelly one. Used it for monitoring the temperature on my boilers flow and return pipes. With an additional device in the pump cupboard I can see the heat loss on the pipes from the boiler to the pump and back to the boiler. I’ve not got a condensing boiler so the return temperature is not critical, but when I have to replace my old boiler I should be able to predict what flow temperature I can run and I can see the impact of inculcation on my pipe work.
Review: Quick and easy way to monitor temperatures - I added this to a Shelly 1 Plus and fitted it with 5 long DS18B20 temperature sensors to be able to check that cold water pipes were not getting cold enough to freeze. The Shelly app shows the data as nice graphs, but I also have them connected to Home Assistant using MQTT, which works really well. It was very easy to install the device by clipping it to the Shelly 1 Plus and wiring in the sensor leads (although the screw terminals are really tiny).

## Features

- 𝗩𝗲𝗿𝘀𝗮𝘁𝗶𝗹𝗲 𝗦𝗲𝗻𝘀𝗼𝗿 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻: Connects up to five DS18B20 temperature sensors or one DHT22 sensor via 1-Wire terminals, enabling precise temperature and humidity monitoring for various applications
- 𝗔𝗻𝗮𝗹𝗼𝗴 & 𝗗𝗶𝗴𝗶𝘁𝗮𝗹 𝗜𝗻𝗽𝘂𝘁𝘀: Features both analog and digital inputs, allowing integration with a wide range of sensors such as photoresistors, PIR motion detectors, soil moisture sensors, and more for comprehensive automation scenarios
- 𝗖𝗼𝗺𝗽𝗮𝗰𝘁 & 𝗘𝗮𝘀𝘆 𝗜𝗻𝘀𝘁𝗮𝗹𝗹𝗮𝘁𝗶𝗼𝗻: Operates on 3.3 V DC supplied by the connected Shelly Plus or Gen3 device and mounts easily alongside it inside standard electrical boxes
- 𝗦𝗰𝗵𝗲𝗱𝘂𝗹𝗶𝗻𝗴 & 𝗧𝗶𝗺𝗲𝗿𝘀: Set up timers and personalized schedules per channel or create scenes for full-home automation

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BRBMKB53 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 58,531 in DIY & Tools ( See Top 100 in DIY & Tools ) 6,329 in Electrical |
| Colour | Black |
| Customer Reviews | 4.8 4.8 out of 5 stars (1,366) |
| Date First Available | 1 Jan. 2023 |
| Included components | 1x Shelly Plus Add-ON |
| Item Package Quantity | 1 |
| Item Weight | 13 g |
| Item model number | 3800235266427 |
| Manufacturer | Shelly Europe |
| Material | Plastic |
| Measurement Accuracy | ±0.5°C |
| Measurement System | Metric |
| Part number | Plus Add-on |
| Plug profile | Flush Mount |
| Power source type | DC |
| Product Dimensions | 3.71 x 4.19 x 3.71 cm; 13 g |
| Size | 1er Pack |
| Special Features | Can be used with up to five DS18B20 sensors or one D |
| Specific uses | Temperature and humidity sensing, home automation control, irrigation automation |
| Specification met | RoHS |
| Style | Pack of 1 |

## Product Details

- **Brand:** Shelly
- **Item dimensions L x W x H:** 37 x 42 x 37 millimetres
- **Item weight:** 13 Grams
- **Material:** Plastic
- **Style:** Pack of 1

## Images

![Plus Add-On | Add-On for Shelly Plus & Gen3 Devices | Temperature and Humidity Sensor Interface | Home Automation | DS18B20, DHT22 & Arduino Sensors | Analog and Digital Input | No Hub Required - Image 1](https://m.media-amazon.com/images/I/81WwVQX0FrL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Add on to a Shelly one.
*by U***D on 5 August 2025*

Fantastic add on to a Shelly one. Used it for monitoring the temperature on my boilers flow and return pipes. With an additional device in the pump cupboard I can see the heat loss on the pipes from the boiler to the pump and back to the boiler. I’ve not got a condensing boiler so the return temperature is not critical, but when I have to replace my old boiler I should be able to predict what flow temperature I can run and I can see the impact of inculcation on my pipe work.

### ⭐⭐⭐⭐⭐ Quick and easy way to monitor temperatures
*by X***X on 4 January 2026*

I added this to a Shelly 1 Plus and fitted it with 5 long DS18B20 temperature sensors to be able to check that cold water pipes were not getting cold enough to freeze. The Shelly app shows the data as nice graphs, but I also have them connected to Home Assistant using MQTT, which works really well. It was very easy to install the device by clipping it to the Shelly 1 Plus and wiring in the sensor leads (although the screw terminals are really tiny).

### ⭐⭐⭐⭐⭐ Watch out for VPN's
*by A***8 on 13 December 2025*

Works well. Added the unit to a Shelly 1PM to get powered, first time using Shelly products had a slight problem getting the device to sync up with app, figured out it was a VPN problem and now it works. Added a 2 temp sensors on my hot water tank and works perfectly. Wished I knew about these devices earlier.

## Frequently Bought Together

- Shelly Plus Add-On | Wi-Fi & Bluetooth Add-On for Shelly Plus Devices | Measure Temperature and Humidity | Home Automation | Works with Alexa & Google Home | iOS Android App |No Hub | Digital Sensor
- Shelly Plus 1 UL | WiFi Smart Relay Switch with Dry Contacts | Home Automation | Bluetooth Gateway | Alexa, SmartThings & Google Home Compatible | No Hub | DIY Remote Control | Garage Door Opener

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-01-28*