SONOFF S31 WiFi Smart Plug with Energy Monitoring, 15A Smart Outlet Socket ETL Certified, Work with Alexa & Google Home Assistant, IFTTT Supporting, 2.4 Ghz WiFi Only (2-Pack)

Flashed Tasmota, and calibrated power use. They are working great, except I found out my deep freeze uses a lot more power than I thought it did.

The power adaptor is WiFi based, and I still havent connected to hassio yet. I tried to reset the device into local API mode, but still no luck yet. The android app is clunky and requires a cloud login. I run hassio cloudless. After much frustration with DIY mode, I tried flashing it with tasmota. Soldering the wires was a bit delicate - I suggest using headers instead. Then I learned that some FTDI and other serial tools have 5v power with 3.3v logic. After I finally got a fully 3.3v setup, the board appears dead. It just emits zeros. Even if it works, it then needs calibration. Sonoff ZigBee devices, in comparison are flawless and just work. I think Im done with Sonoff Wifi devices for now. I already have one power meter that I made from a raspi and an inductive current sensor. Power measurement isnt that hard. That cost a little more, but I wasnt fighting a black box, I was building with fully specd components. This might work flawlessly for some people. Maybe I just have a broken unit. Still, nowhere near as simple as their zigbee devices.

I can now track the wattage of appliances in my home so I can use push notifications when they finish.

This is a warning to anyone who wants to purchase this that they should consider the App Store reviews for the required app to run these. At the time of writing this, eWeLink-Smart Home has a 2.8 star rating plagued with bugs and all kinds of issues. This app is required to use this device and you need to have an account with them in order to link to your Google Home so when considering this product I highly suggest you consider the App rating. There is also a ton of privacy issues associated as it requires you send your location information, other data, home network access, and identifiers in order to create an account which is your email address. It is also not clear who I am sending this data to, or why it needs persistent location data. This is a Sonoff product that requires an eWeLink app which has the support email going to Shenzhen Cool House Technology Co., Ltd. When clicking on the Privacy Policy on the app store it doesnt actually go anywhere and just takes you to a home page that is in another language and when translated has no links to the Privacy Policy. Not a product I would want running inside my home network.

Works for medium to large size appliances, but smaller devices that use 5V power (most USB style devices or small devices), do not register on the devices power monitor. It goes to 0.1W, so if your device uses 1W or less, its near impossible to get a positive this device is definitely using power answer from the power monitor data (for use in home automation). All that being said, the connectivity and setup was very solid.

Works well with Home Assistant.

I bought these to use with Tasmota and it works great! Easy to disassemble with a screwdriver and a spudger, easy to solder points that are clearly labeled for programming, and doesnt look scratched up from disassembly at all. The Tasmota software is even able to see the power factor, watts, apparent power, volts, and amps! I didnt try the app that came with it, it probably sucks as most smart outlet apps do.

This has been our favorite smart plug for quite some time. And now being UL listed just edges it up a little higher. Two of the plugs fit fine in the same socket without forcing anything. If you want to manually flash them with Tasmota or some other open source firmware, the WiFi PCB on them is the same as it was previously so all the profiles/templates will work just fine. The product is still held together with screws and no glue so it goes back together super easy.

The S40 brings a new elegant and a little design to the previous one. It is amazing what you can do with the power consumption capabilities. And the best of all is the automatic turn off when there is an overload to protect the connected device. All of its smart options are as expected, they are even better when you have other Sonoff products. For example, I can turn on my wall plug when I turn on my light switch and more, just with the app. Overall, it is an incredible product and a must have in your smart house.

Flash these switches with the OpenSource Tasmota firmware to unlock the full potential of these switches. With Tasmota, there is no cloud dependency, no phoning home, no privacy risk. You can use this switch as a standalone device by accessing the Tasmota web page. Alternatively, Tasmota on this switch provides full integration with MQTT for use with HomeAssistant or OpenHab. I have five of those switches with Tasmota installed and they are bulletproof. The remote control of the switch is great, but the real-time power monitoring is just awesome. I use these switches to monitor amperage and wattage draw of 3D printers. Plus, these are great for any hardware you wish to remote switch.