Personal computing discussed

Moderators: mac_h8r1, Nemesis

 
Captain Ned
Gold subscriber
Global Moderator
Topic Author
Posts: 26461
Joined: Wed Jan 16, 2002 7:00 pm
Location: Vermont, USA

Normally Closed (NC) switches

Thu Aug 31, 2017 8:49 pm

Yeah, I'm getting arcane with this one.

The inside station of my garage door opener has a complete spaz-out every time I lose power (welcome to VT and pole-seeking drunken pickup drivers). The solution so far is to unscrew the station from the wall and disconnect one terminal wire so that the flea-bit chip in it reboots. I'd like to make this process much easier by incorporating a doorbell-style normally-closed switch in the low-voltage feed wire to the opener station so that a reboot means nothing more than me pushing the reboot switch for 10 seconds or so.

Doorbell switch you say? Six for the buck at Lowe's/Home Depot/Menards. They're all normally open and only make contact when pressed. I need one that is normally closed and breaks contact when pressed.

I've been to DigiKey and other such outlets and all I've found is industrial stuff that far exceeds my needs, the available space, and sanity.

Does anyone here know of a doorbell button that is a normally-closed switch?
If the Earth were flat, cats would have pushed everything off of it by now.
 
blahsaysblah
Gerbil Elite
Posts: 580
Joined: Mon Oct 19, 2015 7:35 pm

Re: Normally Closed (NC) switches

Thu Aug 31, 2017 10:00 pm

Why not a simple old style single pole light switch. That's less than a $1 from HD. And than you get option to have it off if you ever want to.

But you seem to be looking for those closet/cabinet switches.

Leviton 1865 3 Amp, 125 Volt, Single-Pole, Doorjamb with Jamb Box Switch, Single Circuit Momentary, Normally ON, Commercial Grade, Brass

search for momentary.
 
videobits
Gerbil
Posts: 49
Joined: Fri Jun 17, 2005 10:18 pm
Location: Olathe, KS

Re: Normally Closed (NC) switches

Thu Aug 31, 2017 10:53 pm

I'm guessing you want the simplicity of a surface mounted switch since your reference a doorbell switch.

Challenge accepted....I was interested in what I might find. How about this?
https://www.amazon.com/Emergency-Exit-S ... ary+switch

Dirt cheap if you can wait for the free shipping.

Another thought: If this is a 3-6 times per year event, maybe you could just insert a quick disconnect terminal inline on some exposed wire. You would have to yank it apart and reinsert but no tool would be needed and dirt cheap if you have a crimp tool already.

https://www.amazon.com/dp/B000FK9X26?ta ... pcomp&th=1

If you ever get a new opener and have a torsion spring already....grab a Liftmaster 8500. Works great and no messing around with rails, chains and hanging mounts. A much cleaner install and quiet to boot.
 
ludi
Darth Gerbil
Posts: 7441
Joined: Fri Jun 21, 2002 10:47 pm
Location: Sunny Colorado front range

Re: Normally Closed (NC) switches

Thu Aug 31, 2017 11:27 pm

How about this:

https://www.alliedelec.com/te-connectiv ... eEEALw_wcB

Just need a 1/4" drill bit to make the mounting hole.
Last edited by ludi on Thu Aug 31, 2017 11:29 pm, edited 1 time in total.
Abacus Model 2.5 | Quad-Row FX with 256 Cherry Red Slider Beads | Applewood Frame | Water Cooling by Brita Filtration
 
just brew it!
Gold subscriber
Administrator
Posts: 49673
Joined: Tue Aug 20, 2002 10:51 pm
Location: Somewhere, having a beer

Re: Normally Closed (NC) switches

Thu Aug 31, 2017 11:28 pm

If you want something that can easily be mounted on the wall, how about a magnetic switch like the ones used for window alarms? Use the NC contacts and set the magnet piece on top of the switch piece for a few seconds to interrupt the power and reboot the opener.

https://www.amazon.com/Magnetic-Switch- ... 0735BP1K4/
Nostalgia isn't what it used to be.
 
curtisb
Gerbil XP
Posts: 394
Joined: Tue Mar 30, 2010 11:27 pm
Location: Oklahoma

Re: Normally Closed (NC) switches

Thu Aug 31, 2017 11:29 pm

If you're going low voltage wouldn't a simple toggle switch that you can pickup in the automotive section at Walmart work?
ASUS MAXIMUS VIII HERO | Intel Core i7-6700 | Asus STRIX GTX 970 4GB | 4 x Corsair LPX 8GB | 2 x Crucial MX200 500GB | 2 x Hitachi Deskstar 4TB | Phanteks Eclipse | Seasonic X-850 | Dell UP2516D
 
just brew it!
Gold subscriber
Administrator
Posts: 49673
Joined: Tue Aug 20, 2002 10:51 pm
Location: Somewhere, having a beer

Re: Normally Closed (NC) switches

Thu Aug 31, 2017 11:33 pm

I think he's looking for something he can easily flush-mount to the wall.

Or if there's room in the unit's housing, he could mod it with a small through-mount one like ludi linked.
Nostalgia isn't what it used to be.
 
Captain Ned
Gold subscriber
Global Moderator
Topic Author
Posts: 26461
Joined: Wed Jan 16, 2002 7:00 pm
Location: Vermont, USA

Re: Normally Closed (NC) switches

Fri Sep 01, 2017 8:31 am

Never thought about the mag switch, but that's perfect and I can easily grab one at the Lowe's around the corner. Thanks.

And yes, flush-mount on the plywood garage wall was my goal.
If the Earth were flat, cats would have pushed everything off of it by now.
 
just brew it!
Gold subscriber
Administrator
Posts: 49673
Joined: Tue Aug 20, 2002 10:51 pm
Location: Somewhere, having a beer

Re: Normally Closed (NC) switches

Fri Sep 01, 2017 9:11 am

As a bonus, the mag switches even have screw terminals. All you'll need is a wire stripper and screwdriver, no soldering required.
Nostalgia isn't what it used to be.

Who is online

Users browsing this forum: Kennethtoimb and 2 guests