







🌟 Elevate your smart home game with precision sensing—because your space deserves next-level intelligence!
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 additional hub, enabling easy installation inside standard electrical boxes. Ideal for precise temperature and humidity monitoring, irrigation control, and advanced home automation with customizable scheduling.

























| ASIN | B0BRBMKB53 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 34,015 in DIY & Tools ( See Top 100 in DIY & Tools ) 3,886 in Electrical |
| Colour | Black |
| Customer Reviews | 4.8 4.8 out of 5 stars (1,398) |
| 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 |
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.
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.
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.
A**R
It works, what more to say
Instructions in box very limited, look on the web for instructions.
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
E**N
Ich nutze das Add-On zusammen mit einem Shelly Plus 1PM zur Überwachung und Steuerung meiner Garagentor-Automation. Kombiniert mit einem DS18B20 Temperatursensor und einem Reedkontakt, ergibt sich eine sehr zuverlässige, smarte Steuerung mit Rückmeldung über App. ⸻ ✅ Highlights aus der Praxis: • Einfacher Anschluss an den Shelly Plus – Stecker sitzt fest, keine Fummelei • Sensoren werden direkt erkannt – sowohl Temperatur als auch digitaler Eingang (für Garagentorkontakt) funktionierten auf Anhieb • Über die App sofort konfigurierbar, keine Extra-Firmware oder Bastelarbeit nötig • Temperatur- und Feuchtigkeitswerte werden regelmäßig übertragen – perfekt für Frostüberwachung oder Raumklima in Garage, Keller oder Werkstatt • Mein Video zeigt: Torstatus über Kontakt + Steuerung per App → zuverlässig, keine Latenz ⸻ 🧠 Technischer Hinweis: Das Add-On ist kein eigenständiges Gerät, sondern eine clevere Erweiterung – das sollte man wissen. Dafür funktioniert es stabil, schnell und fehlerfrei, wenn man die richtigen Sensoren nutzt. ⸻ 📌 Fazit: Geniale Ergänzung für alle, die mehr aus ihrem Shelly-Setup herausholen wollen. Ob Temperatur, Luftfeuchtigkeit oder Statusüberwachung – das Add-On macht’s möglich. 5 von 5 Sternen – funktional, kompakt und durchdacht.
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