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lud@lemm.ee ⁨1⁩ ⁨day⁩ ago

XNOR (Exclusive NOR) is the opposite of XOR (Exclusive OR)

A way to remember XOR is “must have one or the other but not both” XNOR is the opposite so it’s “must have both” so either both inputs are 1 or 0.

XNOR or XOR is very common in homes with staircases so that you can turn on and off the light in the staircase regardless of which floor you are on.

If you google staircase switches, you will be told that they mostly use XOR but according to the wiring diagrams they use XNOR.

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humanspiral@lemmy.ca ⁨1⁩ ⁨day⁩ ago

XNOR is the opposite so it’s “must have both”

so AND. Always AND.

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- lud@lemm.ee ⁨1⁩ ⁨day⁩ ago
  My bad. It’s “must have both or non”
  
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RamblingPanda@lemmynsfw.com ⁨1⁩ ⁨day⁩ ago
That’s the reason I set up Home Assistant. I’m not smart enough for wiring.

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- lud@lemm.ee ⁨1⁩ ⁨day⁩ ago
  Wiring a stairway switch is actually very easy you pretty much just need two wires going from one switch to another and then a light
  
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  - A_Union_of_Kobolds@lemmy.world ⁨1⁩ ⁨day⁩ ago
    I was gonna say lol that’s a fancy way of describing three-ways
    
    Fun fact, you can put as many 4-ways in between those 3-ways as you want, or as many as your electrician will agree to anyway. You can switch the same light from a dozen spots if you really want to.
    
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    MonkeMischief@lemmy.today ⁨1⁩ ⁨day⁩ ago
    “The light won’t turn off! Now to hunt down the ONE SWITCH in the house that’s flipped…hnngg…”
    
    Troll electricianship would be hilarious entertainment.
    
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    RamblingPanda@lemmynsfw.com ⁨1⁩ ⁨day⁩ ago
    I have no clue what that means. More diagrams plz?
    
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  - RamblingPanda@lemmynsfw.com ⁨1⁩ ⁨day⁩ ago
    I understand it now, but I’ll have it forgotten in five minutes. I’m a software engineer, this here is dark magic to me. Well, not this, but more complicated stuff. I envy you all for your big, juicy brains.
    
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    lud@lemm.ee ⁨1⁩ ⁨day⁩ ago
    Oh, I am no electrician. I work in IT.
    
    Being an electrician would be pretty high on the list of things to do if I weren’t allowed to work in IT though. Seems fairly fun.
    
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ayyy@sh.itjust.works ⁨1⁩ ⁨day⁩ ago
Isn’t that the same as AND but with a lot of extra words?

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- lud@lemm.ee ⁨1⁩ ⁨day⁩ ago
  No, AND won’t match 0,0 while XNOR will. An AND switch would be useless for a staircase.
  
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