[OpenTRV-interest] First impressions and questions

[Jason Pearce]

Hi Damon,

Feel free to lurk :)

I wasn't explicit enough - remote sensor - something like a stats hub being
used wirelessly in sensor mode to send data to a (or more than one) local
trvs in a room - stats hub at a convenient height/location - the box you
sent with my stats hub is discreet enough - the trv in my bedroom was
measuring around 22 celcius - it wasn't actually that hot in the room, so
the trv sensor is being affected by the radiator.

Something else I pondered earlier - I like my bedroom to be warm when I
wake up to get dressed for work - but if the occupancy sensor thinks I'm
out cause it's dark, it won't have preheated the room to a nice cosy
temperature.

And finally - my eq3 trvs do a weekly "exercise" to ensure the pin on the
trv base doesn't stick - thats something I would consider a useful function
to have.

Regards,
Jason

On 25 January 2017 at 15:53, Simon Hobson <linux at thehobsons.co.uk> wrote:

> Jason Pearce <jason at pearce.org.uk> wrote:
>
> > First Impressions
> > - It's big !! - for some reason, my impression from looking at the
> opentrv/earth websites was that this would be smaller than it is
>
> I'd been wondering about that, hard to tell from a picture, but just
> scaling from the mounting screw ring indicates that it's not small ! Looks
> something like 50% wider and 150% taller than my existing heads.
>
> I guess that's one of the compromises from being a small manufacturer. If
> designing from the outset to make millions of them, then more custom parts
> becomes more practical, and sizes can be got down.
>
> > - It sounds a little noisey - I've just installed it in the bedroom to
> see if it passes the test with my wife :)
>
> I suspect some noise damping on the motor/inside teh case might help with
> that, at least from the photos I've seen online.
>
> > - If opentrv turns off one room because it isn't occupied, do we risk
> draughts if one room becomes colder than another ?
>
> That's always a risk if rooms are at different temperatures. Cold air will
> spill along the floor to the warmer room, while warm air will flow across
> the ceiling in the other direction. On the other hand, with our house I
> don't think we'd be able to differentiate between that and the regular
> draughts we have !
>
> > Future - will the following be possible
> > - remote control of target temperature per TRV (will the stats hub
> become two way) ?
>
> It's been indicated that such things (specifically 2-way comms) is likely
> to come in the future - when they've worked out how to do it securely AND
> without killing battery life. Power considerations are different between
> "wake up radio, send burst of data, turn off radio" and "be ready to
> receive information IF it's sent".
>
> > - remote temperature/occupancy detector - some of my radiators are
> behind furniture - not ideal, but affects the detection of the room
> temperature
>
> That's already possible if you get the soldering iron out ;-)
>
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