[OpenTRV-dev] Occupancy sensing, was intro

[Bo Herrmannsen]

of course keep it small

it was more like worst case if we had to upgrade at some point

after adding the RFM irq we have 2 digital left unless i overlooked one

and the analogs of course... while on the analog i figured one use for 
them... attach an analog humidty sensor and heat room so it does not get to 
"wet".. ie if user sets a low temp like 5 and water starts to run down the 
walls

/bo

-----Oprindelig meddelelse----- 
From: Damon Hart-Davis
Sent: Tuesday, October 01, 2013 7:45 AM
To: Closed list for developer discussions
Subject: Re: [OpenTRV-dev] Occupancy sensing, was intro

Hi,

My view is the reverse: we already have *lots* of I/O which should suffice 
and we ought to be able to trim to fit.  We want to keep small and simple 
for cost and power reasons.

But I think that the SMD version of the ATmega328 has a couple of extra I/O 
pins available anyway.

Rgds

Damon


On 1 Oct 2013, at 05:58, Bo Herrmannsen wrote:

> hmm
>
> i was thinking... what if we run out of io pins... what is the next step 
> in line of atmel chips we can but arduino on?
>
> /bo
>
> -----Oprindelig meddelelse----- From: Damon Hart-Davis
> Sent: Monday, September 30, 2013 2:41 PM
> To: Closed list for developer discussions
> Subject: [OpenTRV-dev] Occupancy sensing, was intro
>
> Hi,
>
> Please excuse some savage editing of subject line and below.
>
> OpenTRV occupancy is still a lot more primitive than I'd like, but one 
> technique I use a fair amount (sometimes it seems like only tool in my 
> inadequate stats toolkit) is interquartile ranges of values observed over 
> at least a day or preferably 7 days.
>
> So, for example, when background luminance is the the lowest quartile 
> having measured for at least a day, I deduce that people are not using the 
> room or at least not active.  That's reasonably robust and doesn't depend 
> on absolute levels.
>
> A similar thing might work for even doppler: *relatively* little activity 
> may be interpretable as equivalent to none or lack of occupancy.
>
> But the stuff you're talking about sounds good too.  Good novel sensors 
> and good signal processing / stats are a winning combo, I hope.
>
> Rgds
>
> Damon
>
>
> On 30 Sep 2013, at 13:29, Adrian Godwin wrote:
>
>> The problem with Doppler is that I want to detect occupancy without 
>> movement, eg sleeping. This isn't easy but we're experimenting with some 
>> 16 pixel thermal cameras. These might be able to learn environmental 
>> warmth and distinguish it from bodies.
>>
>> On 30 Sep 2013 12:03, "Bo Herrmannsen" <EMAIL ADDRESS HIDDEN> wrote:
>> ...
>>
>> Hmm... about sensor... is that not only true for IR types?...
>>
>> /bo
>>
>> From: Adrian Godwin
>> Sent: Monday, September 30, 2013 11:57 AM
>> To: Closed list for developer discussions
>> Subject: Re: [OpenTRV-dev] intro
>>
>> ...
>
>> On Mon, Sep 30, 2013 at 10:42 AM, Bo Herrmannsen 
>> <EMAIL ADDRESS HIDDEN> wrote:
>> Hi
>>
>> ...
>
>>
>> From: Adrian Godwin
>> Sent: Friday, September 27, 2013 12:27 PM
>> To: EMAIL ADDRESS HIDDEN
>> Subject: [OpenTRV-dev] intro
>>
>> Hi,
>> ...
>>
>> I was at the Connecting Homes even in connection with an energy-managed 
>> house project. This also requires good occupancy sensors and we're 
>> looking at a crude thermal imaging camera. We think there might be a case 
>> for making a ceiling-mounted occupancy sensor with light and temperature 
>> sensors and I'm wondering if this could share some development with your 
>> plans.
>>
>> -adrian
>>
>>
>
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