ShellyH&T Gen3 White | Wi-Fi & Bluetooth Smart Temperature & Humidity Sensor with Remote App Control | Smart Scenes | LCD Display

I am a software developer. I spent a lot of time reviewing different devices, interfaces and their specifications. I wrote software to manage this device, including RPC, Bluetooth and MQTT. I am also very experienced in the dynamics of environmental monitoring for residential and commercial buildings.In my opinion this is an excellent humidity and temperature monitor at a low cost for home automation. The interfaces are well documented, easy to work with and there are numerous open-source implementations and libraries available.If you are a non-developer or a home automation user, this device will monitor humidity and temperature and perform well.I have read comments regarding long times to report changes. Temperature and humidity do not change rapidly in normal residential or commercial environments. If you require fast change detection, you are designing for a problem this device is not intended for. This device reports on wakeup every six minutes. The reason is to save battery life. That is sufficient in normal environments.If you require fast response times, select a different type of device that is plugged into a power source and reports continuously. The device will need to support rapid temperature and humidity changes and those types of instruments are much more expensive. The big issue is accuracy when detecting changes. It does no good to use a cheap device that reports every 5 seconds if the changes are only +-20% accurate. Accuracy requires either time or money.

I have three of these. I just have them hit a local web server and report temperature and humidity. If you want something to poll, this isn't what you are looking for. They instead only connect to wifi and "push" data when the temperature or humidity changes. I suspect thats due to it running on AA batteries, and trying to get good battery life. As long as you are okay with that, then these work great.I'm using one to check outdoor temperature, and one to monitor the temperature of my dog house. I have the web server kick on a local power switch when it gets too cold, which kicks on a 200w panel heater (designed for chickens) and warms the dog house. Then I have it kick off when it gets too hot. The dog appreciates it when its super cold out. I have it kick on at 55 and off at 65. I wouldn't want to use it for too narrow of a temperature range though because I've seen it wait until 53 to turn on and it sometimes stays on a few degrees higher then 65.I prefer Shelley devices since they can be used without cloud involvement and they are good for hobbyists that find no reason to send sensor data all the way to a data center just so local devices can then reach back out to the data center to act upon the data. When you have everything working locally, response times are in the millisecond range instead of the second range (which can grow to the minutes range during high usage).

Pretty accurate hygrometer with great e-paper (e-ink?) display. Display is large enough to read everything clearly without my glasses and set up was fairly easy. Bought this unit because of the flexibility to take batteries for power or use USB cable to power the unit as we didn’t want to replace or recharge batteries frequently, in addition to good display.Knocked off 1 star because USB cable needs to be removed every time the back cover needs to be removed to sync. Sync/reset button is under the battery cover, and the cover cannot be removed without unplugging USB cable. (Only required during initial setup) Shouldn’t be a problem for those who choose batteries.Specifically bought this unit to hook it up with Home Assistant with Shelly plugin and it did not disappoint. Picked it up fine and reading well over WiFi.The price of this unit is about the same as other WiFi Hygrometers on the market, but can be expensive if we wanted this throughout the house. But for the reliability so far of Shelly products, we’d definitely consider this unit again.

I have purchased many Shelly devices. All the devices I have purchased were easy to use and setup.The Shelly H&T Gen 3 is the worst device. It to 1 hour to get it set up. it worked fine for about an hour after that.Left it alone all night never came back on line. Temperature and humidity is way off. I have 3 other wireless thermostats on my mini splits they are within 1º of each other the Shelly was 10º off from them. Tried for 2 hrs. to get it to show up on my network again. USELESS. If you don't believe me do a google search!.Send it back, I will find a different brand!

The e-ink display on this thing is great. If your primary use case is to have a thermometer/hygrometer/clock to look at, then this device is a great pickup.If you also want to have some historical data for a device like this, you will get it here. It can use the app itself, the “Shelly cloud” or easily connect to Home Assistant (though it does require a small manual step of telling it to push its data to HA”. Soon, this is supposedly supposed to get Matter support as well.Finally, I believe this device makes too strong of a compromise to save battery power. The device will push data at a maximum rate of every 5 minutes, but only if the temperature or humidity change by some threshold. If the temp/humidity does not change by enough, then it just will not push updates. The thresholds are 1 deg F and 2% RH. If you are wanting to use this to drive an adhoc thermostat, it is just not great unless your acceptable hysteresis is like 3-5 deg F.This device could easily become a 5+ star device if the update rate was configurable down to 10-30 seconds range. It will also be a great sign if this device does in fact get the Matter upgrade that is being teased/promised at this time.Update: I’m now using this device in a thermostat automation and it works great. I prefer devices with a zigbee or thread radio, but this thing is rock solid and works well with my rechargeable NiMH AA batteries.