Author Topic: Moteino Based Battery Operated Sprinkler Valve  (Read 13635 times)

DonpK

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Re: Moteino Based Battery Operated Sprinkler Valve
« Reply #45 on: September 10, 2018, 11:20:08 AM »
My Moteinos in their "waterproof" boxes have only been outside for several months this  summer.
Quote
I've never had an enclosure that, by itself, prevented corrosion inside the box
Where on the Moteino board would you expect to see the first signs of corrosion and after what period of time, roughly (I'm sure it depends on  the actual conditions of the specific installation).

TomWS

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Re: Moteino Based Battery Operated Sprinkler Valve
« Reply #46 on: September 10, 2018, 12:31:24 PM »
Where on the Moteino board would you expect to see the first signs of corrosion and after what period of time, roughly (I'm sure it depends on  the actual conditions of the specific installation).
Corrosion is only noticeable when it starts to affect the behavior, so the most obvious places are connector pins and battery contacts.  However, the first places it starts to 'grow' is where it begins to bridge between nearby metal surfaces that have a different electrical potential on them - the most obvious is the processor's pins.  After about a year or so, depending on the humidity and temperature extremes, without protection, you'll see 'hairs' growing on and between the pins. 

I can post photos in October - I don't have access to those at the moment.

Tom

DonpK

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Re: Moteino Based Battery Operated Sprinkler Valve
« Reply #47 on: September 10, 2018, 12:38:44 PM »
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I can post photos in October


Please do. I'm sure many of us are working on outdoor projects.

ecliptic

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Re: Moteino Based Battery Operated Sprinkler Valve
« Reply #48 on: September 28, 2018, 09:44:36 AM »
Another question if you don't mind.

It looks like your PCB is supported inside of the case; however, the drill holes do not line up with the case (from what I can tell).  Where did you end up putting your battery holder/batteries inside of your case?  My assumption is that it's underneath your PCB, but I wasn't sure if there was some part that helps support the PCB when the stock drill holes do not align.  Thanks!

TomWS

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Re: Moteino Based Battery Operated Sprinkler Valve
« Reply #49 on: September 28, 2018, 04:18:45 PM »
Another question if you don't mind.

It looks like your PCB is supported inside of the case; however, the drill holes do not line up with the case (from what I can tell).  Where did you end up putting your battery holder/batteries inside of your case?  My assumption is that it's underneath your PCB, but I wasn't sure if there was some part that helps support the PCB when the stock drill holes do not align.  Thanks!
The module is just held in place by gravity, supported by the battery case which is mounted on the back side of the PCB.  Since the valve box is held fairly solidly on the ground, there isn't any problem with the unit being loose in the enclosure.  There is no vibration or movement to affect it.

Tom

ecliptic

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Re: Moteino Based Battery Operated Sprinkler Valve
« Reply #50 on: September 30, 2018, 12:45:29 PM »
Again.. thank you!