Am looking for a freezer thermometer that can be read (& receive
alerts?) remotely.

My sister has a freezer in a weekend cottage with a load of food in it,
and it would be a shame to loose it.
There are occasional outages (which are bearable) and sometimes just one
circuit on the RCD trips (which we may or may not know about)

We have hive for heating (but they don't appear to have any thermometers
of any sort), and a couple of webcams, so we know if the power goes off
in the whole house or on certain circuits, but it would be nice to get
some warning if the freezer gets too warm (there is a friendly neighbour
who will go in and flick a breaker switch as necessary)

Any recommendations/thoughts?

TIA

On 22/05/2019 13:19, Allan wrote:
Am looking for a freezer thermometer that can be read (& receive
alerts?) remotely.

My sister has a freezer in a weekend cottage with a load of food in it,
and it would be a shame to loose it.
There are occasional outages (which are bearable) and sometimes just one
circuit on the RCD trips (which we may or may not know about)

We have hive for heating (but they don't appear to have any thermometers
of any sort), and a couple of webcams, so we know if the power goes off
in the whole house or on certain circuits, but it would be nice to get
some warning if the freezer gets too warm (there is a friendly neighbour
who will go in and flick a breaker switch as necessary)

Any recommendations/thoughts?

You have internet connection. My suggestion would be to put a smart lamp
on the same circuit as the freezer and check that it is controllable
once a day with a script. You might get the odd false positive where the
lamp has just gone AWOL for reasons of its own.

Most freezers can stand 48 hours without power provided you don't open
the freezer door. Alternatively you could use a webcam with audio to
listen for the freezers own audible alarm (assuming it has one).

--
Regards,
Martin Brown

Many burglar alarms can ring a certain number silently I believe, so maybe
the interruption of the voltage is the best thing to detect and then be
informed by phone.
Brian

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On 22/05/2019 13:19, Allan wrote:
Am looking for a freezer thermometer that can be read (& receive alerts?)
remotely.

My sister has a freezer in a weekend cottage with a load of food in it,
and it would be a shame to loose it.
There are occasional outages (which are bearable) and sometimes just one
circuit on the RCD trips (which we may or may not know about)

We have hive for heating (but they don't appear to have any thermometers
of any sort), and a couple of webcams, so we know if the power goes off
in the whole house or on certain circuits, but it would be nice to get
some warning if the freezer gets too warm (there is a friendly neighbour
who will go in and flick a breaker switch as necessary)

Any recommendations/thoughts?

You have internet connection. My suggestion would be to put a smart lamp
on the same circuit as the freezer and check that it is controllable once
a day with a script. You might get the odd false positive where the lamp
has just gone AWOL for reasons of its own.

Most freezers can stand 48 hours without power provided you don't open the
freezer door. Alternatively you could use a webcam with audio to listen
for the freezers own audible alarm (assuming it has one).

--
Regards,
Martin Brown

On 22/05/2019 13:19, Allan wrote:
Am looking for a freezer thermometer that can be read (& receive
alerts?) remotely.

My sister has a freezer in a weekend cottage with a load of food in it,
and it would be a shame to loose it.
There are occasional outages (which are bearable) and sometimes just one
circuit on the RCD trips (which we may or may not know about)

We have hive for heating (but they don't appear to have any thermometers
of any sort), and a couple of webcams, so we know if the power goes off
in the whole house or on certain circuits, but it would be nice to get
some warning if the freezer gets too warm (there is a friendly neighbour
who will go in and flick a breaker switch as necessary)

Any recommendations/thoughts?

TIA

ZWave has temperature sensors with probes on wires and the ZWave signal
can generally manage from a house to a shed, if your walls aren't foil
lined or mentally thick.

https://www.uk-automation.co.uk/z-wa...sor-by-fibaro/

Needs 12V. Try Qubino too - they might have a mains one, you'll need to
pop in a plastic box and run the probe out.

The harder part is to choose a sensible Hub - but it can be done with a
Pi and https://www.home-assistant.io/getting-started/

The benefit is that you can pop on a flood sensor or two, room
temperature sensor to alert to freezing conditions and turn a couple of
lights on and off for anti burglar reasons.

--
Email does not work

Allan wrote:
We have hive for heating (but they don't appear to have any thermometers
of any sort), and a couple of webcams, so we know if the power goes off
in the whole house or on certain circuits, but it would be nice to get
some warning if the freezer gets too warm (there is a friendly neighbour
who will go in and flick a breaker switch as necessary)

Any recommendations/thoughts?

There are thermometers with wireless sensors, like this:
https://www.amazon.com/AcuRite-00986.../dp/B004QJVU78
(tons of similar things across ebay and amazon)

and some are network accessible:
https://tidbits.com/2018/07/25/wirel...eezer-failure/

I'd probably want one where the sensors speaks wirelessly to some kind of
external box. The sensor itself is thus very low power (small battery) and
doesn't emit any heat to disturb the freezer, while the external box might
take a few watts.

I'd guess the first kind speak basic 433MHz or something similar, and
wouldn't be surprised if someone has reverse engineered the protocol.

Theo