[OpenTRV-dev] OpenTRV at local ham club

[Bo Herrmannsen]

not if you ask me....

of course the pi can talk direct to the RFM etc....

but yes its a cheap failsafe in case the SD goes bad etc


2014-07-29 12:21 GMT+02:00 Kevin Wood <EMAIL ADDRESS HIDDEN>:

> Hi Stuart,
>
> You make a valid point. There's probably not much, if anything, there that
> the Pi couldn't do itself.
>
> Having said that, one of the other requirements is that it needs to be
> fairly robust against power cuts, so the AVR started out as "supervising"
> the Pi - providing battery backup power, commanding the Pi to shut down
> cleanly when the power fails and so on, and it then seemed sensible to
> make that also responsible for the other time-critical interfaces such as
> driving the RFM and the dallas sensors. In fact, I have it in mind that,
> if the Pi corrupts its' flash card and dies completely, the AVR will still
> be able to control the heating.
>
> Maybe I'm being too paranoid?
>
> Kevin
>
> > Kevin,
> >
> > Out of interest what's the reasoning behind having the AVR rather than
> > getting the Pi to do it all directly ?
> >
> > Cheers
> >
> > Stuart
> >
> > On 29/07/14 10:35, Kevin Wood wrote:
> >> Hi Bo,
> >>
> >> I'm actually working on something quite similar at the moment for a
> >> second
> >> home that needs frost protection / monitoring remotely, in this case
> >> with
> >> oil fired heating.
> >>
> >> My plan is a raspberry pi attached to an AVR which controls the heating
> >> system.
> >>
> >> I'm thinking that the AVR can harvest temperature data from a couple of
> >> OneWire sensors, run the heating and hot water schedules and control
> >> relays that activate the heating system as required. It'll also have an
> >> RFM on the board for later integration with OpenTRV and, if I can
> >> reverse
> >> engineer it, the wireless oil level sensor on the oil tank.
> >>
> >> R-Pi can host a web interface or, more likely in the first iteration,
> >> provide a mechanism to at least SSH into it and check everything
> >> remotely.
> >> Of course it could also do email notifications and SMS would be possible
> >> either via an internet SMS gateway, or just hang a GSM module off it
> >> with
> >> a cheap pay as you go SIM installed?
> >>
> >> Does this premises have internet connectivity?
> >>
> >> Kevin
> >>
> >>> I was at local ham club last night at looked at their heating
> >>>
> >>> So far i "THINK" its all electrical heating as there is no district
> >>> heating
> >>> installed, makes things a bit more easy since heat not used will go
> >>> back
> >>> to
> >>> the cylinder :-D
> >>>
> >>>
> >>> Next bit, there is one big room with 4 rads, which means one box should
> >>> control them all, the box will be central placed. Its mainly old timers
> >>> so
> >>> the less complicated the better, the rest of the rooms are one rad per
> >>> room.
> >>>
> >>>
> >>> Mostly @kevin but others might chip in, they have some kind of remote
> >>> control where they can send a text to turn stuff on and they would like
> >>> to
> >>> be able to turn on the heat remotely, how could we get to that?
> >>>
> >>> the point is that when the house is locked heating should turn off
> >>> completely or run at 5degree to prevent frost issues. then either by
> >>> remote
> >>> command or when house is unlocked it should go to warm mode, there
> >>> would
> >>> be
> >>> no need to sense if its day or night or if people are in the room etc.
> >>> the
> >>> alarm will output a signal when its on/off
> >>>
> >>> any ideas?
> >>>
> >>> /bo
> >>>
> >>> --
> >>>
> >>>                   |||||
> >>>                 @(~Ô^Ô~)@
> >>> -------------oOo---U---oOo-------------
> >>> |                                     |
> >>> |  Bo Herrmannsen                     |
> >>> |                                     |
> >>> |                                     |
> >>> | "blessed are the "cracked",         |
> >>> |  for its they who let in the light" |
> >>> |                         Ooo         |
> >>> |_________________ooO____(   )________|
> >>>                   (   )    ) /
> >>>                    \ (    (_/
> >>>                     \_)
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> >>>
> >>
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-- 

                 |||||
               @(~Ô^Ô~)@
-------------oOo---U---oOo-------------
|                                     |
|  Bo Herrmannsen                     |
|                                     |
|                                     |
| "blessed are the "cracked",         |
|  for its they who let in the light" |
|                         Ooo         |
|_________________ooO____(   )________|
                 (   )    ) /
                  \ (    (_/
                   \_)
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