Temperature sensors in homey

Hi

I am interested in a way to get temperature readings into homey for freezer,fridge,jacuzzi water, water heater/boiler etc.

The suggestions I find for this is a DS18B20 attached to a shelly uni plus.
And for the freezer also AA/AAA batteries soldered to an Aqara device or similar can also last for a while.

First of all, I wonder how stable this Shelly uni actually is, I see people reporting it needs to be reset/rebooted a lot etc. And what is the actual WiFi range like? ( normally the provided range values are far away from the truth).
And is there any way to receive notifications from Homey IF device is “offline”/values 0 or value haven’t been updated in xx time.

I also appreciate other/better suggestions for other devices/solutions at a reasonable price.

I wouldn’t put the shelly uni in the freezer or cooler (I’m not even mentioning the jacuzzi :wink:)…

Apart from the humidity, WiFi signal will be bad in a farady’s cage…

But I’ve Aqara zigbee sensors in fridge and freezer, works great.
Probably those are not-so-good Faraday cages, and it probably depends on the used model
And a DS18B20 is a wired sensor, the Shelly Uni can be put on the outside of the fridge.

@steff :

I haven’t seen one post here. Can you show me the source?

Shelly’s have normal wifi range. If your wifi system covers your home, Shelly’s should work fine.

Yeah, I just posted this one in an other topic:

Ik heb een keer een “Aqara Zigbee temperatuursensor T1” in de vriezer gelegd. Vond de sensor na een dag niet meer leuk. :cry:

Of staat mijn vriezer te hoog :slight_smile:

I have had these inside for almost 4 years:
https://www.zigbee2mqtt.io/devices/WSDCGQ11LM.html#aqara-wsdcgq11lm

It can handle up to -20°C according to the specs, but regularly shows -21 or even lower.
Freezer is just set to -18°C.
Did I just have “the right model”? :stuck_out_tongue_winking_eye:

Ik ga nogmaar eens een poging wagen :slight_smile:

The button cell dies a lot faster because of the cold.

Hi,
I have exactly this configuration, with three Shelly unis, each with two DS18B20 sensors, measuring the temperatures of:

  1. Freezer / Water boiler (they are next to each other)
  2. Air heat pump, floor 1, intake / outlet air temperatures
  3. Air heat pump, floor 2, intake / outlet air temperatures

I have had them about a year now, and they have worked flawlessly, without any problems at all. I can’t say much about WiFi range, though, as I have a meshed WiFi network with good coverage of the whole house.

They are all powered by power adapters, not batteries.

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Thanks for all answers.

I have installed an uni plus with a DS18B20 sensor, but does anyone know what is causing the temperature value to disconnect for a couple of seconds? It happens up to several times in a hour. I have seen others having problems with this aswell, but not a solution.

I am powering it with a 5V USB charger. I have tried opening ports 6010, 6011, 6012, 6020, 6021, 6022, 6110, 6113, 5353, 443.
Also tried swapping out for another USB charger. Rated around 800mA