# Temperature sensors in homey **URL:** \ **Category:** Questions & Help\ **Created:** [January 1, 2025, 2:10pm UTC](https://community.homey.app/t/temperature-sensors-in-homey/126108 "2025-01-01T14:10:52Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![steff](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/steff/32/121069_2.png) [@steff](https://community.homey.app/u/steff)\ **Post date:** [January 1, 2025, 2:10pm UTC](https://community.homey.app/t/temperature-sensors-in-homey/126108/1 "2025-01-01T14:10:52Z")
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. ---
**Author:** ![JohanP](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/johanp/32/119002_2.png) [@JohanP](https://community.homey.app/u/JohanP)\ **Post date:** [January 1, 2025, 4:47pm UTC](https://community.homey.app/t/temperature-sensors-in-homey/126108/2 "2025-01-01T16:47:18Z")
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… ---
**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\ **Post date:** [January 1, 2025, 6:54pm UTC](https://community.homey.app/t/temperature-sensors-in-homey/126108/3 "2025-01-01T18:54:07Z")
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](https://community.homey.app/t/a-script-to-check-sensor-last-update/63142/39): > > 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 wink 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… ---
**Author:** ![Undertake](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/undertake/32/28488_2.png) [@Undertake](https://community.homey.app/u/Undertake)\ **Post date:** [January 2, 2025, 7:54am UTC](https://community.homey.app/t/temperature-sensors-in-homey/126108/4 "2025-01-02T07:54:03Z")
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 🙂 ---
**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\ **Post date:** [January 2, 2025, 11:58pm UTC](https://community.homey.app/t/temperature-sensors-in-homey/126108/5 "2025-01-02T23:58:34Z")
I have had these inside for almost 4 years: [https://www.zigbee2mqtt.io/devices/WSDCGQ11LM.html#aqara-wsdcgq11lm](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”? 😜 > ![1000040630](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/3/6/36a1c282f83244a8d1cf4ea1b5a6c335a21385d5.jpeg) ---
**Author:** ![Undertake](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/undertake/32/28488_2.png) [@Undertake](https://community.homey.app/u/Undertake)\ **Post date:** [January 4, 2025, 9:03am UTC](https://community.homey.app/t/temperature-sensors-in-homey/126108/6 "2025-01-04T09:03:38Z")
> [@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 🙂 ---
**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\ **Post date:** [January 4, 2025, 8:59pm UTC](https://community.homey.app/t/temperature-sensors-in-homey/126108/7 "2025-01-04T20:59:03Z")
The button cell dies a lot faster because of the cold. ---
**Author:** ![Yngve\_Nystrand](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/yngve_nystrand/32/90873_2.png) [@Yngve\_Nystrand](https://community.homey.app/u/Yngve_Nystrand)\ **Post date:** [January 8, 2025, 3:28pm UTC](https://community.homey.app/t/temperature-sensors-in-homey/126108/8 "2025-01-08T15:28:53Z")
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. ---
**Author:** ![steff](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/steff/32/121069_2.png) [@steff](https://community.homey.app/u/steff)\ **Post date:** [January 21, 2025, 9:25pm UTC](https://community.homey.app/t/temperature-sensors-in-homey/126108/9 "2025-01-21T21:25:30Z")
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