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shower detection

For discussion of DIY weather equipment - sensors, accessories, improvements to existing kit etc
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juliang
Posts: 5
Joined: Thu 26 Apr 2012 10:48 am
Weather Station: wh-1080
Operating System: xp
Location: Norfolk

shower detection

Post by juliang » Thu 26 Apr 2012 11:12 am

this is not really a forecasting matter but....

With all these April showers it would be very useful to have something that caused a sound or flashed a square when the rain bucket tripped after a specified time to indicate the start of a shower.

It might be necessary to have a means of varying the interval since the previous trip and even the number of trips.

Would help me get the washing dry? (wh1080)http://sandaysoft.com/forum/posting.php ... b669879b19#

AllyCat
Posts: 1056
Joined: Sat 26 Feb 2011 1:58 pm
Weather Station: Fine Offset 1080/1 & 3080
Operating System: Windows XP SP3
Location: SE London

Re: shower detection

Post by AllyCat » Thu 26 Apr 2012 8:31 pm

Hi,

You can set the hour or 24-hour rain "alarm" threshold on the WH1080 (and others) below a single-tip (e.g. 0.2mm) and it will indeed sound on the first tip. You probably need to use the Easyweather software to do this as it doesn't seem obvious which alarm is being set via the console.

However, 0.3 mm is quite a lot of rain so your washing will still probably get wet(ter). I tried using a large funnel above the gauge but it didn't make the "first tip" occur any earlier, because more rain drops collected on the funnel surface (due to surface tension) but didn't run down to the see-saw quickly enough. Maybe spray some WD40 on the surface?

If you want a sensitive detector, I think Steve posted a link to a capacitive sensor earlier this year, but it wasn't cheap.

Cheers, Alan.

nest9020
Posts: 3
Joined: Tue 19 Feb 2013 8:59 pm
Weather Station: WS-2080
Operating System: Windows 7
Location: USA

Re: shower detection

Post by nest9020 » Tue 05 Mar 2013 8:25 pm

you can build a cheap rain detector like this.
I will take a picture of the actual sensor and post it later.
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nest9020
Posts: 3
Joined: Tue 19 Feb 2013 8:59 pm
Weather Station: WS-2080
Operating System: Windows 7
Location: USA

Re: shower detection

Post by nest9020 » Wed 06 Mar 2013 12:15 am

as promised a picture of the sensor and circuit. Cost about $2.00
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BillW
Posts: 67
Joined: Thu 23 Jun 2011 6:28 pm
Weather Station: Ultimeter 2100 + 5 in man. gauge
Operating System: Win 7 Pro
Location: Kilwinning, Ayrshire, UK.

Re: shower detection

Post by BillW » Wed 06 Mar 2013 9:32 am

Hi,
If you're looking for a ready to go product (please note this is not an endorsement, I just saw it talked about elewhere) the KEMO M152 rain detector might suit your needs.
Do a google for suppliers, retails for ~£20.
Regards,
Bill.

AllyCat
Posts: 1056
Joined: Sat 26 Feb 2011 1:58 pm
Weather Station: Fine Offset 1080/1 & 3080
Operating System: Windows XP SP3
Location: SE London

Re: shower detection

Post by AllyCat » Wed 06 Mar 2013 12:05 pm

Hi,

Yes, an interesting "hobby" project that could be quite useful (for example) if you still put washing out in the garden to dry. But IMHO two major weaknesses, it really needs an audible alarm, and must be cleaned of water once triggered. Maybe using "Veroboard" (copper-clad stripboard) could be more rugged. I see that the Kemo uses a heater to "reset" the device by evaporating off the water, but not very practical for battery operation.

More expensive, of course, but there's also the very interesting Hydreon RG-11 which can give continuous, unattended detection of "it's raining (or not raining)".

Cheers, Alan.

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