[OpenTRV-interest] Schedule/profile setting (was: OpenTRV board as 868MHz transceiver)

[Alasdair Macdonald]

Is COHEAT a software variant or a hardware variant that is not
available to my V0.2 REV2 board? It sounds like something I would like
to try. I understand that the security layer is not yet implemented.

Does "dumb-ish relays of the COHEAT-central-control valve open
percentage" mean that one can only send an open percentage command
(rather than, say, "Boost")?

On 10 January 2016 at 11:39, Damon Hart-Davis <dhd at exnet.com> wrote:
>
>> On 10 Jan 2016, at 10:41, Simon Hobson <simon at thehobsons.co.uk> wrote:
>>
>> Damon Hart-Davis <damon at opentrv.uk> wrote:
>>
>>> 2) Because of security considerations the OpenTRV valve-controller units have been transmit-only up to now, with the glorious exception of the COHEAT variant where they act as dumb-ish relays of the COHEAT-central-control valve open percentage.  Our intention very soon (I am working on the security code right now) is to allow to you to tell each OpenTRV unit what temperature you want to be at, overriding its internal logic.  (It would revert to that internal logic if/while it lost the radio link.)
>>
>> OK, so at the moment, each valve does it's own thing in terms of determining whether the heating should be "on" ? Is this done entirely by occupancy detection ?
>>
>> I'd been working on the assumption that "somewhere" there's be a clock and a schedule similar to what most people are familiar with on a conventional setup with "time clock & stat". From the sound of it, this isn't there "yet" ?
>
> Hi,
>
> OpenTRV is designed to work entirely locally by default (you set a target temperature which is maintained while you are around, and cut back the when you’re away and shouldn’t notice).  That keeps the minimum entry price down to just one valve, no central console or Internet connection or smartphone needed.  Also, most people simply don’t interact with central heating controls though fear or apathy, up into the high-90%s depending on whose numbers/anecdotes you believe.
>
> However, once we have a secure backlink that we’re happy with, a central unit can override the local algorithm and keep doing so, allowing full central control, eg pre-programmed times and temperatures for the whole house, and better house modelling for better savings, and predictive responses to weather forecasts, for those that want it.
>
> Rgds
>
> Damon
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