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What type of button stays pressed until pressed again?
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What type of button stays pressed until pressed again?

by rizla420 on Sun Sep 05, 2010 11:27 am

Im having trouble finding the right pushbutton because im not sure exactly what its called. I've purchased in the past a lot of momentary pushbuttons that have a springy feel. Once you push it in, it pops back up after you take your finger off. I believe their called momentary pushbuttons.

What im looking for is a button the same form factor, but that when i press it in, it stays down until i press it again and it comes back up.

Anyone can point me in the right direction or a link on digi/mouser?

Thanks, much appreciated.
Last edited by rizla420 on Sun Sep 05, 2010 11:44 am, edited 1 time in total.

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Re: What type of butotn stays pressed until pressed again?

by adafruit_support_bill on Sun Sep 05, 2010 11:32 am

Search for a "Push On-Push Off Switch".

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Re: What type of butotn stays pressed until pressed again?

by rizla420 on Sun Sep 05, 2010 11:40 am

Just found this, can someone explain what the switch function of: OFF-MOM is? im assuming its off and momentary, but is that what im looking for?

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P12218SCT-ND

I like the fact that it has only two long leads, i'd prefer that over the typical 4 legs you see on the tactile switches.

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Re: What type of button stays pressed until pressed again?

by adafruit_support_bill on Sun Sep 05, 2010 12:03 pm

That's a normally off, momentary contact switch. The longer leads are more convenient for prototyping sometimes. They stay-put in the breadboards better.

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Re: What type of button stays pressed until pressed again?

by rizla420 on Sun Sep 05, 2010 12:08 pm

arduwino wrote:That's a normally off, momentary contact switch. The longer leads are more convenient for prototyping sometimes. They stay-put in the breadboards better.


I've been searching for push on push off switch, but they all seem to be these huge buttons. I thought they made them similar to the tactile pushbuttons.. keeping on exploring. I wish that was in the parts wiki.

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Re: What type of button stays pressed until pressed again?

by adafruit_support_bill on Sun Sep 05, 2010 12:12 pm

I've never seen a push-on/push-off in that form factor. The little tactile switches are fairly simple devices with only one moving part. The push-on/push-off requires an additional latching mechanism.

What is the application? If you will have a microcontroller in the mix, you can easily emulate that functionality in code.

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Re: What type of button stays pressed until pressed again?

by rizla420 on Sun Sep 05, 2010 12:22 pm

arduwino wrote:I've never seen a push-on/push-off in that form factor. The little tactile switches are fairly simple devices with only one moving part. The push-on/push-off requires an additional latching mechanism.

What is the application? If you will have a microcontroller in the mix, you can easily emulate that functionality in code.


Just registering a particular state of the button and keeping it that way until i pressed it again, i wanted to do it mechanically, but your right I could also do it with the MC.

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Re: What type of button stays pressed until pressed again?

by zener on Sun Sep 05, 2010 1:27 pm

Those are called, on-on, alternate action, alternating, or latching.

Alps has a small one: SPPH210100 www.alps.com but I don't know where you can buy it.

CK had a cheap right angle one: http://search.digikey.com/scripts/DkSea ... CKN1189-ND

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Re: What type of button stays pressed until pressed again?

by westfw on Sun Sep 05, 2010 5:33 pm

http://search.digikey.com/scripts/DkSea ... 01-1132-ND
There are normally switches like these that show up in cheap electronic products (battery-operated closet lights and such) and surplus outlets at low prices, but I'm not seeing any at my usual haunts...
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Re: What type of button stays pressed until pressed again?

by rizla420 on Mon Sep 06, 2010 7:40 pm

westfw wrote:http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=401-1132-ND
There are normally switches like these that show up in cheap electronic products (battery-operated closet lights and such) and surplus outlets at low prices, but I'm not seeing any at my usual haunts...



Thats basically what I had in mind, but I'd prefer the SPST which are even harder to find it seems. I did find this guy which i can substitute for, but its a bit pricey..
http://www.allelectronics.com/make-a-store/item/PB-21/SPST-PUSHBUTTON-PUSH-ON/PUSH-OFF//1.html

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Re: What type of button stays pressed until pressed again?

by zener on Mon Sep 06, 2010 7:57 pm

Just ignore the extra pole!

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Re: What type of button stays pressed until pressed again?

by rizla420 on Mon Sep 06, 2010 8:26 pm

Zener wrote:Just ignore the extra pole!


haha, i know i can do that. i just want to be particular about it. :D. I eneded up finding a guy on ebay who was selling a 10 pack of the ones i listed about for 3.99, so i get em each for .39 cents which isnt too shabby.

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