[OpenTRV-dev] OpenTRV at local ham club

[Stuart Poulton]

Kevin,

I wasn't saying there was a right or wrong way to do it, just opening a 
discussion on it.

Stuart

On 29/07/14 11:21, Kevin Wood wrote:
> 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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