Temperature sensors in homey

[steff]

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.

[JohanP]

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

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

[Peter_Kawa]

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 :

@steff

I see people reporting it needs to be reset/rebooted a lot

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.

@steff

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.

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

A script to check sensor last update

As there is for some time options to see Lastseen timestamp for Zigbee devices, here is the script for Zigbee devices only, which might be more accurate for Zigbee devices. Thanks @Caseda for your overview script Version 0.3 - updated for HomeyScript v. 3.5.1 Version 0.3b - fixed for THEN card (returning TEXT value), primary use-better use is for AND card though Version 0.4 - added option to filter out routers and/or end devices Version 0.5 - added option to exclude ZONES, moved varia…

[Undertake]

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

Of staat mijn vriezer te hoog

[Peter_Kawa]

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”?

[Undertake]

@Peter_Kawa

pecs tot -20°C aan, maar geeft regelmatig -21 of nog lager aan.
Vriezer staat gewoon op -18°C.
Had ik net “het goede model” dan?

Ik ga nogmaar eens een poging wagen

[Peter_Kawa]

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

[Yngve_Nystrand]

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.

[steff]

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