Re: [mh] Analog_Sensor and expired sensor reading

[Lieven H. <li...@li...>]

Hello David,

perfect, indeed that's what I was searching for.

Thanks,
 Lieven.

On Sun, Oct 11, 2009 at 06:23, David Norwood <dno...@ya...> wrote:

>  Since Analog_Sensor is derived from Generic_Item, you can use the get_idle_time
> method on that object to return the seconds since it was last set.
>
> David
>
>
> ----- Original Message -----
> *From:* Lieven Hollevoet <li...@li...>
> *To:* The main list for the MisterHouse home automation program<mis...@li...>
> *Sent:* Saturday, October 10, 2009 1:54 PM
> *Subject:* [mh] Analog_Sensor and expired sensor reading
>
> Hello,
>
> I'm trying to couple readings from my ambient lightlevel sensor with
> Misterhouse. The reason is that I would like to use Misterhouse to control
> some lights and our window blinds, and that I would like to use the real
> light conditions instead of the ones calculated by Misterhouse.
>
> Some background: the sensor itself reports its readings wirelessly to a
> 'gateway' that is on my LAN. Misterhouse then periodically interrogates the
> gateway to get the readings. The gateway keeps a counter that is reset every
> time a valid RF packet is received. In this way, I can know how fresh the
> value is that I read from the gateway. If for some reason the gateway is not
> receiving RF packets, I don't want Misterhouse to react on an 'old' value.
> If the counter is bigger than 250, I consider the reading to be too old to
> be used.
>
> The basics are already working (see attached code file), but I have a
> specific question concerning the 'freshness counter' in the gateway.
>
> I'm using an ANALOG_SENSOR to keep track of the current lightlevel (between
> 0 and 100%). Is there a way to make clear that the current measurement that
> is done for the analog sensor is not valid any more?
>
> What I'd like to obtain is that if I request the value of the analog_sensor
> item in usercode,  I could first verify if the value is still valid.
>
> Theoretical example user code in combination with attached file:
>
> # Switch on the desklight if it is getting dark
> my $desklight_auto_on_allowed = 1;
>
> if (new_minute) {
>
>     my $lightlevel = $sa_lightlevel->measurement();
>
>
>     if ($lightlevel > 70 and $sa_lightlevel->valid()) {
>         $desklight_auto_on_allowed = 1;
>     }
>     if ($lightlevel < 30  and $sa_lightlevel->valid() and
> $desklight_auto_on_allowed){
>     &::print_log("It is dark outside ($lightlevel %), switching desklight
> on...");
>     $desklight->set("ON");
>     $desklight_auto_on_allowed = 0;
>     }
>
> }
>
> Can somebody point me in the direction on how to solve this please?
>
> Kind regards,
>  Lieven.
>
> ------------------------------
>
>
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