Does this cheap temp sensor work? Topic is solved

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stuiow
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Does this cheap temp sensor work?

Post by stuiow » Thursday 26 January 2017 11:50

Hi all,
Looking for a cheap sensor for my fridge and freezer.

Anyone any input on this device? Does it work with RFXTRX433?

http://www.ebay.co.uk/itm/311504966753? ... EBIDX%3AIT

Thanks!
Stuart
Now setup on a RPI3.
Also using Evohome HGI80, RFXTRX433E and a Aeotec Gen5 stick. Mainly a Gen5 Z-Wave system.
My weather (Davis vantage Pro2) data is obtained by weatherunderground
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SweetPants
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Re: Does this cheap temp sensor work?

Post by SweetPants » Saturday 28 January 2017 14:03

That is uses 433Mhz does not automatically means it's supported. Have you checked the supported device list ? http://www.rfxcom.com/WebRoot/StoreNL2/ ... _Guide.pdf
Ubuntu 16.04.5 LTS, Intel NUC, MySensors 2.3.0-alpha, Pro Mini 3.3/8M RFM69(HW), ESP8266 (SDK2.2.0), Sonoff, RFLink, RFXcom, MQTT, NodeRed, Domoticz Beta (from source)

Jem101
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Re: Does this cheap temp sensor work?

Post by Jem101 » Saturday 28 January 2017 15:56

A word of caution, some time ago, I bought two cheap temperature sensors from eBay which look for all the world like the one shown in your link. They seem to work OK in Domoticz and appear as a FineOffset/Viking device. But the reported temperature swings wildly between (and I'm not making this up) +85 degrees C and -145 degrees C which I were living on Mercury might be reasonable but it's a bit much even for London.

As I only paid about £5 for the pair, I'm not too bothered about it, every time there is a firmware upgrade for the RFXCom, I dig one of them out, put some fresh batteries in it and try it again, but so far no luck.

Of course it might be a different model inside but it does look suspiciously like the ones I have.
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sion
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Re: Does this cheap temp sensor work?

Post by sion » Saturday 28 January 2017 22:01

I just got one of these to try:
http://m.ebay.co.uk/itm/Extra-Sensor-fo ... Ciid%253A1

Only £7.99, but it's currently 66 degrees c in here ;)

The temp has stayed stable only increasing or decreeing by a few degrees, so I may just need to adjust the offset in domoticz. Just need to get a real thermometer to set it to.

Would be interesting to know if you try the one in the post to see if it works well though. It's a good price if it does.
running domoticz 3.4834 on rpi2, with
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lightwave rf sockets, mood controlers, sensors & contacts.
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Ha bridge / echo Alexa.
Hard wired alarm system - setting home / away status.

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StanHD
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Re: Does this cheap temp sensor work?

Post by StanHD » Sunday 29 January 2017 0:31

sion wrote:I just got one of these to try:
http://m.ebay.co.uk/itm/Extra-Sensor-fo ... Ciid%253A1

Only £7.99, but it's currently 66 degrees c in here ;)

The temp has stayed stable only increasing or decreeing by a few degrees, so I may just need to adjust the offset in domoticz. Just need to get a real thermometer to set it to.

Would be interesting to know if you try the one in the post to see if it works well though. It's a good price if it does.
I have used 5 of these for 2+ years with an offset of -40 degrees. No problems so far :)
Domoticz Main - Intel nuc, Windows, RFXTRX433E. Lan Relay Boards, Aeon Z-Stick Gen 5, Evohome HGI80, Milight WiFi, MySensors Ethernet Gateway, Harmony Hub
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stuiow
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Re: Does this cheap temp sensor work?

Post by stuiow » Sunday 29 January 2017 0:36

I see Lidl here in the UK have temperature stations that are also posted in the bargains forum.
I may opt for a couple of those. Though worrying an update is received every 30seconds.
Might keep the rfxtrx busy.

Sent from my SM-G925F using Tapatalk
Now setup on a RPI3.
Also using Evohome HGI80, RFXTRX433E and a Aeotec Gen5 stick. Mainly a Gen5 Z-Wave system.
My weather (Davis vantage Pro2) data is obtained by weatherunderground
Now collecting rtl_433 data from Apollo Ultrasonic meter

sion
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Re: Does this cheap temp sensor work?

Post by sion » Sunday 29 January 2017 1:27

StanHD wrote:
sion wrote:I just got one of these to try:
http://m.ebay.co.uk/itm/Extra-Sensor-fo ... Ciid%253A1

Only £7.99, but it's currently 66 degrees c in here ;)

The temp has stayed stable only increasing or decreeing by a few degrees, so I may just need to adjust the offset in domoticz. Just need to get a real thermometer to set it to.

Would be interesting to know if you try the one in the post to see if it works well though. It's a good price if it does.
I have used 5 of these for 2+ years with an offset of -40 degrees. No problems so far :)
Excellent.
-40 offset sounds about right to what mine is reading.
running domoticz 3.4834 on rpi2, with
Hue bridge / bulbs.
lightwave rf sockets, mood controlers, sensors & contacts.
Home bridge / Siri.
Ha bridge / echo Alexa.
Hard wired alarm system - setting home / away status.

Next: harmony hub.

sion
Posts: 122
Joined: Friday 08 January 2016 13:32
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Re: Does this cheap temp sensor work?

Post by sion » Sunday 29 January 2017 19:38

StanHD wrote:
sion wrote:I just got one of these to try:
http://m.ebay.co.uk/itm/Extra-Sensor-fo ... Ciid%253A1

Only £7.99, but it's currently 66 degrees c in here ;)

The temp has stayed stable only increasing or decreeing by a few degrees, so I may just need to adjust the offset in domoticz. Just need to get a real thermometer to set it to.

Would be interesting to know if you try the one in the post to see if it works well though. It's a good price if it does.
I have used 5 of these for 2+ years with an offset of -40 degrees. No problems so far :)
I have just noticed the one of these I have is updating and writing to the log approx once a min. Just wondering if you have 5 of these going, has it caused you any problems with rf interference? Or sd card ware?
running domoticz 3.4834 on rpi2, with
Hue bridge / bulbs.
lightwave rf sockets, mood controlers, sensors & contacts.
Home bridge / Siri.
Ha bridge / echo Alexa.
Hard wired alarm system - setting home / away status.

Next: harmony hub.

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StanHD
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Re: Does this cheap temp sensor work?

Post by StanHD » Sunday 29 January 2017 19:48

Every once in a while, 2 will "collide". This lasts @ 12 hours or less, then all good for another 6-8 months or more. I use an SSD on an Intel NUC so not really worried about the writes.
Domoticz Main - Intel nuc, Windows, RFXTRX433E. Lan Relay Boards, Aeon Z-Stick Gen 5, Evohome HGI80, Milight WiFi, MySensors Ethernet Gateway, Harmony Hub
Domoticz Slave - Asrock Ion - Linux, Python:- Broadlink RM2, Sonos
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SDISDI
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Re: Does this cheap temp sensor work?

Post by SDISDI » Thursday 07 June 2018 22:41

Hi. I bought one of the sensors discussed above to monitor temperature (and alarm) for a chest freezer. Worked fine, even with the low temperatures and in the metal box!

http://m.ebay.co.uk/itm/Extra-Sensor-fo ... 1788376051

Issue was, when I enable the protocol FineOffset/Viking on RFXCOM, as per the manual, it impedes a HomeEasy PIR sensor I use. The PIR is more important, so I have abandoned the sensor for now.

Can anyone tell me if the item below uses the plain Imagintronix protocol? (which is fine with the HomeEasy kit I have)

https://www.ebay.co.uk/itm/Wireless-The ... 1397773764

Thanks.
RFXtrx433E
Hive 2 Active Heating
Owl CM180 Energy Monitor
Various HomeEasy Receivers
LightwaveRF Plug-in sockets

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