Shelly Plus Uni | Smart Wi-Fi and Bluetooth Operated Module with Dry Contacts | Home Automation | Compatible with Alexa & Google Home | No Hub | Precise Voltmeter | Pulse Counting | Sensor Interface

These Unis work well for making old garage openers smart and be able to control 2 doors with such a small, prebuilt micro-controller. Small yet it is wifi enabled. The current wifi opener controller is not so great. This Uni is simple and I can make the sensors work as I prefer. I will be using 2 sensors on a single door to check door status, as well as latch status. I use it with a regulated 12V power adapter.I will be using another one for monitoring my car battery. I had situations where the battery became low several times. The Uni is perfect to wire up inside the car as a battery voltage monitor. Is sends me messages when its below the threshold.The Shelly App is easy to use and setup. I can also setup scenes and send notifications to my phone. The Uni has 2 wifi connections, so that I can setup home as well as one from my cell when away. Love the fact that it has 2 inputs and 2 potential-free outputs. The built-in voltage measurement via analog input is very accurate. The power consumption is low. Instructions are great and there is much info online as well. The Uni works as expected.

Using two USB A power adapters and an e26 to 120 female plug adapter, I set this up to watch the power status of the garage door opener light to switch other outdoor lights on when activated.Wiring follows:Red/White: +5VDC from opener adapter.Black: -5VDC from opener adapter.Grey: +5VDC always on adapter.Green: -5VDC always on adapter.All others trimmed and taped off.The White analog wire connected to the Red wire allowed me to use the Voltmeter functionality to set up a trigger in Home Assistant when voltage was detected at the garage door light socket. I now have extra lighting when I come home in the dark and the other lights are also set to turn off and mirror the status of the garage.TP-Link, while their products are my go-to for price point and functionality, they don't report power status reliably.While this module has many features, the ones mentioned in this review made it extremely useful for getting a quick report in power status change, yielding useful light triggering. I didn't go through the trouble of adding a bleed resistor to the opener power adapter because I found a usb adapter that drained quickly after power off. There was some experimentation involved and I was lucky to have a generic usb adapter that met my needs. This functionality depends on how quickly any leftover charge is left in the adapter, so your results and implementation will vary from mine.

Understand wiring diagram and device limitations. I fried 2 before using correctly. Don't think instructions are completely clear.

The only reliable web-enabled device that can act as a digital voltmeter that I've found. A bit tricky to program some functions.

Cool little device. I have one in my camper to keep an eye on the battery voltage. One of a million uses for the plus uni.

Easy to connect to via BT or WiFi.BT requires the Shelly app, WiFi only needs your browser.These are very low power/performance so they take a bit to get online, that is to be expected, it performs as promised.The Rpi Pico is $7 cheaper.The difference is the Rpi requires you o be interested in having an understanding of programming rather than the Uni needing the ability to work through some confined scripting.If the Uni offered a deal on buying a few together I would have done that, guess they like their single item profit level more than they care for increased sales.

I've been using UNIs throughout my van. I have 15 or so running. They aren't super durable, but printed 3d cases for them and am careful about the loads I control. The switches are low amp, so use a relay if you are controlling any real load. If you toggle power accidentally, they'll lose their connection to the wireless, but they are easy to add back with the shelly app. The devices work well with Home Assistant, and they are easy to wire up. They seem to handle a range of input power just fine (12v to 13.7v) though I did put eventually wire them with regulated 12v power just in case. The older ones use less power than the new Uni Plus. The new plus versions do seem more solidly built.

While it is a little more expensive than it should be (for what it is), but it is a very neat IoT device! Extremely easy to use and setup with some pretty neat software features on it! I had it listening for Bluetooth advertisements (from my Victron solar components), reading the temperature and battery voltage, and relaying that information to my MQTT server. Unfortunately, like others have mentioned, the poor wireless range was its downfall. It could barely make it 90' of near-empty space (one window, one 1/4" board). I ended up having to retire it after a few months of service as it just couldn't hold a steady WiFi connection -- even with its own dedicated AP and network! Hopefully, they will make a version with a better or at least external antenna in the future.