Rain sensor

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KathyNS
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Rain sensor

#1

Post by KathyNS »

I have been using a wet-leaf water sensor to detect rain, in order to auto-close my dome if the weather tanks. It is reliable and sensitive, and it responds instantly. It is too sensitive, as it turns out, because it triggers on dew. I don't need dew protection, since I have a solid-tube Newtonian in a dome. So I am looking for a rain detector that discriminates between rain and dew.

I have had recommendations of the RG11 from Hydreon, and the M152 from Kemo. The simple solution of putting a heater under the wet leaf sensor turns out not to be competitive with these units. The Kemo unit is basically that, pre-assembled.

The down side of the Kemo unit is that it comes from Germany, and covid-19 has totally messed up transatlantic shipping. It could take months to get here. On the other hand, its performance is what I want. The Hydreon unit is high-tech. I have seen its sensitivity and response time questioned.

So, any other recommendations? Any opinions about the options I have mentioned? Thanks.
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DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Hall's Harbour Observatory (H2O)
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turboscrew
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Re: Rain sensor

#2

Post by turboscrew »

How about https://octopart.com/m152-kemo-47247821

Octopart, Inc.
29 West 38th St.
14th Floor
New York, NY 10018
Senior Embedded SW Designer
Telescope: OrionOptics XV12, dobsonian, all manual.
LAT 61° 28' 10.9" N, Bortle 5

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KathyNS
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Re: Rain sensor

#3

Post by KathyNS »

Useful link. Thanks!
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DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Hall's Harbour Observatory (H2O)
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ic_1101
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Re: Rain sensor

#4

Post by ic_1101 »

Just in case you have not looked at these Arduino options Kathy.


As I said in my other post I know nothing about Arduino so this may be way off base.
Alex
Scope: WIlliam Optics Z61, Mallincam VRC-8 RC
Mount: iOptron CEM70G
Cameras: QHY163m, ASI294mc pro, ASI183mc pro
Software: Pixinsight, AstroPixelProcessor, SGP

https://www.astrobin.com/users/ic_1101/
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KathyNS
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Re: Rain sensor

#5

Post by KathyNS »

Thanks, Alex. That is pretty much what I have now. It doesn't distinguish between rain and dew. It only sees wet or dry.
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DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Hall's Harbour Observatory (H2O)
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ic_1101
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Re: Rain sensor

#6

Post by ic_1101 »

Any way to mitigate just the dew, such as putting the sensor in the bottom of a short acrylic or aluminum tube and putting a dew strap around the tube. Having a short tube (2” or so) the rain would still reach the sensor.
Alex
Scope: WIlliam Optics Z61, Mallincam VRC-8 RC
Mount: iOptron CEM70G
Cameras: QHY163m, ASI294mc pro, ASI183mc pro
Software: Pixinsight, AstroPixelProcessor, SGP

https://www.astrobin.com/users/ic_1101/
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KathyNS
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Re: Rain sensor

#7

Post by KathyNS »

ic_1101 wrote: Mon Nov 09, 2020 4:56 pm Any way to mitigate just the dew, such as putting the sensor in the bottom of a short acrylic or aluminum tube and putting a dew strap around the tube. Having a short tube (2” or so) the rain would still reach the sensor.
Interesting idea, and it would probably work. However, I am not set up for dew heaters; I don't really need them with a solid-tube Newt in a dome. Getting set up with the straps and power controller would cost more than a good rain detector. I think I will order the Kemo unit.
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DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Hall's Harbour Observatory (H2O)
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UlteriorModem
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Re: Rain sensor

#8

Post by UlteriorModem »

They have these things for automated sprinkler systems.

https://cheapsprinklers.com/products/ra ... 20%2422.98
Tom

Current Equipment:
Mount: Celestron CGX-L
Scope: 8" f3.9 "Astrograph"
Cam: ASI071mc-pro
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