Re: Humidity problem

[Dave McLaughlin <dave@xxxxxxxxxxxxxxxxxxxxxxx>]

Hi Rob

If you programme microcontrollers, then check out the Sensirion
SHT11humidity/temperature  sesnor.  If you locate the SHT71 then this is
easier to use as it has pins instead of the surface mount on the SHT11.
Farnell have stock of the SHT11 but awaiting the SHT71.

http://www.sensirion.com/en/sensors/humidity/default.htm

I have code for the Atmel AVR that reads this device that you are
welcome to a copy of if you want to go that route.

Regards
Dave...

---
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egelbeertje wrote:

> Hi,
>
> Our bathroom is located at the innermost part of the house - so no
> windows - which created the need of forced ventilation.
> Currently this is done by walking into the bathroom - knowing that
> you are going to take a shower or bath - and swith on the 20 minute
> timer that drives a fan sucking the air out through a vent hole and
> pipe it through the loft to the outside.
> The timer (a din-module in the loft) is controlled by a pulse switch -
> push it once and you get 20 minutes, push again it switches of. I
> could change the setting so that every push extends the timer by an
> additional x minutes but then I have to wait until it reaches the end
> of the timer cycle.
>
> So I want to automate this one and link it to humidity detection but
> haven't been able to come up with an easy solution - preferrably
> hardwired - something like "hey it's x% humidity - I will click
my
> relay and give a pulse to the timer so it can work for 20 minutes -
> then I will measure again and repeat this cycle" without going
into
> pulling wires back and forth to a home control device since I don't
> have one (yet).
>
> Anybody out there with some bright idea would be welcome to comment.
> Also some guidance on where to find humidity detectors would be a
> good start.
>
> rgds Rob
>