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The Shelly Plus Add-On is a compact, hub-free 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 diverse sensor integration. Powered by 3.3V DC from the host device, it enables precise environmental monitoring and advanced home automation with customizable schedules and scenes, all housed in a sleek form factor for easy installation.

























| ASIN | B0BRBMKB53 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 39,047 in DIY & Tools ( See Top 100 in DIY & Tools ) 4,649 in Electrical |
| Colour | Black |
| Customer Reviews | 4.8 4.8 out of 5 stars (1,357) |
| 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 |
X**X
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).
A**8
Watch out for VPN's
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.
U**D
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.
R**R
Stand Shelly High Quality
Coming to really enjoy using Shelly products, I have one of these add ones but several 2P and an army of 1Ps around the house and they are just rock solid. This add on upgrade was a case of just switching off the parent device, attaching this and the temperature sensors to it and switching back on before adding the sensors in the app. Easy peasy, took all of 10 minutes to read the instructions and implement. Immediately shows up in Home Assistant and readings coming in. Exactly as IOT devices should be, easy and reliable.
J**G
I've been using Shelly devices for several years and have been consistently impressed. These add-ons are fantastic! I have one currently controlling my 240V, 3000W electric space heater. It's configured with one leg of the 240V connection (at 120V) running through the relay, which also powers the Shelly 1. This add-on is connected to a standard DS18B20 temperature probe. Using Shelly's virtual thermostat feature with this add-on, I can precisely control my shop's temperature from anywhere with an internet connection via the Shelly app. I also have another one of these units controlling an exhaust fan in a grow room, connected to a DHT20 temperature and humidity sensor. Both add-ons have been working flawlessly. You can use these devices with a variety of sensors, including soil temperature/moisture sensors, and they can be powered by DC as well. This adds tremendous value to Shelly Plus devices! I highly recommend these add-ons for any home automation project. They are easy to configure and use. In the future, I plan to add a display unit and an OpenHab server to create custom widgets showing the temperature and other metrics all in a nice wall display.
G**.
Al momento funziona benissimo, dopo svariati mesi. Ottimo articolo ,semplice istallazione e se sei pratico ci puoi fare di tutto
C**N
Perfecto para el proyecto
T**M
Parfait pour en complément d'un Shelly plus 1pm
G**D
Works exactly as advertised
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