[OpenTRV-dev] Occupancy sensing, was intro

[Bo Herrmannsen]

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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