Temperature sensor with 2 meter wire


#1

Hello

I´m new but curious about getting smartthings to monitor a large walk-in feezer.

There is a really small pipe going inside the freezer so I was thinking of putting a device outside the freezer and from there have a 1-2 meter cable connected to it that would monitor the tempature.

is there any device out there that you can reccomend with that fits these perimeters?

AlI would have the hub ca 10 meters away, through one concrete wall where I have placed an access point to be connected to…that should work right?

any help highly appreciated, thanks


(Allan) #2

I’ve had a multi sensor in my fridge working just fine for 6+ months that hovers around 40. Not sure how I feel about using it for a freezer though others have said it works.

Personally for a freezer I’d get something like a Adafruit DS18B20 temperature sensor + a ESP8266 running ST_Anything. The sensor is rated for -67* F to +257* F and is waterproof so if you already have a way to route it into the freezer I’d think it’s the best way to go.

I don’t know of a actual Zigbee or Z-Wave sensor that’s made for freezers simply because of battery life being sketchy.


#3

People often use a similar probe sensor with the Fibaro RGBW controller, which can connect to dumb sensors.

You can also connect a temperature probe to one of the Fibaro open/close sensors, which I know sounds strange, but again works and quite a few people are using it.

That said, you’re really going to be pushing it with the concrete wall at 30 m. It’s just going to depend on how much the concrete obstructs signal (which is typically a lot).


#4

Thanks for this

I really love the idea to have this on the door sensor.

Am I correct thinking that I only need the following:

  1. Smartthings hub ( http s://www.vesternet.com/samsung-smartthings-hub )

  2. Fibaro sensor ( https://www.vesternet.com/z-wave-fibaro-universal-door-window-sensor-gen5?compatible_product=F-HUB-UK-V2)

  3. DROK DS18B20 Temperature Sensor ( https://www.amazon.com/DROK-Temperature-Waterproof-Thermometer-Thermistor/dp/B00KLZQ0P8/ref=pd_sim_60_2?_encoding=UTF8&pd_rd_i=B00KLZQ0P8&pd_rd_r=4YR43GXEFCYH32XYCNPE&pd_rd_w=74hPL&pd_rd_wg=bkHDI&psc=1&refRID=4YR43GXEFCYH32XYCNPE )

Is this all I will need to montor the door on the freezer ( just going to put it on the outside, not worried about intrution, just want notification when it’s open ) and then to watch the tempature and get notification if it drops to certain level ?

I know I linked 2 different sites, I’m going to have to order this from UK ( at least the devices but this vesternet site only had 1m of this DS18B20 and only -10°C ) … so either I get the sensor from amazon or I find another site that has this all


#5

thanks for the advice mate but think the solution with bdoor sensor will work me better for this :wink:


(Francis) #6

I’ve done this exact setup. The only problem I seem to be having is the sensor says my pond is 9.4c, but my pond thermometer says the pond is around 14c. This is too much of a difference. Can anything be done to get a more accurate temperature reading?