12VDC Trigger

[Cobra (Andy - United Kingdom)]

One thing to note…
I have found that if they are normally ‘Dry’ then go ‘Wet’ when an alarm is triggered then they are ok.
Constantly holding them at ‘Wet’ runs the battery out in just a couple of days.
For some of mine I ran them from the same PSU with a little voltage regulator from China.

Like I did for this project:

How to tell if it's raining or snowing (Without looking outside!)

I have a conservatory that has electric roof vents/windows & I have a SmartApp I wrote that controls them and opens/closes with temperature. (via a Fibaro roller shutter relay) The problem is… when it rains! Due to the positioning of my conservatory when it rains the wind blows water into the windows if they are open. This leads to a 0% WAF as the conservatory floor gets wet! (and I get into trouble) When we are at home, I manually disable the ‘auto’ settings when it rains which automatically closes the windows. The obvious problem is that we like to leave the house occasionally So I had to do something that will detect when it is raining and close the windows. Searching for some ideas on Google I found this little beauty: Cheap enough at £27.00 to try and not too e…