# Thread: 2 way electrical circuit

1. ## 2 way electrical circuit

I want to fix another switch to the light in the bedroom for my mom so that she can switch off the light from her bed. I need a circuit which will work as follows:

switch on the wall =&gt; switch next to her =&gt; light

ON =&gt; ON =&gt; OFF
ON =&gt; OFF =&gt; ON
OFF =&gt; ON =&gt; ON
OFF =&gt; OFF =&gt; OFF

In other words, the light should switch on only if one of them is switched on and not both.
Any ideas?

Greetings: I would either suggest this.......

http://www.youcansave.com/clap.asp

Or this.......................

http://www.eecs.mit.edu/

Clap On.............Clap off.......................!!!!!

Just kidding man.

I would think a remote control lighting system, there are many of them. You could more than likely figure out a less expensive way to install one.

http://www.alectrosystems.com/lighting/remote.htm

Good Luck.

3. I don't know the english word.. it's called a 'hotel schakelaar' in dutch and a 'interrupteur va-et-vient' in french..

here's how it works..
http://www.zowerkt.nl/inenomhuis/ele...schakelaar.htm (DUTCH !!)

I think the image speaks for itself..

4. Originally posted here by the_JinX
I don't know the english word.. it's called a 'hotel schakelaar'

Jinx as long as you accept that my 'hotel schakelaar' is bigger than yours I am ok with myself.

5. Or this.......................

http://www.eecs.mit.edu/
&lt;sigh&gt;... i wish i could .
heh, but not in this lifetime.

the_jinx:
Thanks. Just what I was looking for. Looks like a little more work than I thought, but I think I can do it.

6. why not the normal 2-way switch?

basicly a pair of single pole double throw switches

http://www.diydoctor.org.uk/projects...d_switches.htm

scroll down to "Two Way Lighting".. there is the basic system..

Now you could make a control circuit from the basic building blocks.. the pattern here looks XOR

0 + 0 = 0
1 + 0 = 1
0 + 1 = 1
1 + 1 = 0

a single exclusive or-gate .. you can use a simple logic pack IC or build it out of transistors.. not that complex..

but the 2 spdt switches looks more reliable..

 JinXey has the original circuit.. I just didnt read the contents of his links untill now....

7. In the US, we use three-way switches to do what you are asking.
http://home.howstuffworks.com/three-way.htm

8. Okay, here's our points:
A-, B-, A+, B+, Lightbulb.

I think this should work... I have this light switch system all over my house.
Go from A-, to lightbulb, to B+, and run the other wire from B+ to Lightbulb, then B-.

Blah, that could be wrong, it's getting late, I'm sleepy... your local home depot fokes would without a doubt be able to tell you for sure.

9. what you need is two single-pole-double-throw switched, and then connect them agains each other...let me try to make an ascii diagram. or PM for further details :P

/ ---------------------------- \
a--------> <------------b
\ ---------------------------- /

basicaly, switches A and B are identical, they have one leg where the power comes in, and two states, either 1 or 2, so, it will either send power down path 1 or 2 depending of how the switch is set, this means that both switches A and B can control the light because they simply need to have the same setting (1-&gt;1 or 2-&gt;2), to turn the ligh of, simply flip a switch, and it will become 1-&gt;2 or 2-&gt;1 which will break the circuit.

This is atleast how we normaly did it.

EDIT: ASCII art sucked something cronic!! used \x0160 rather than \x0032 to fix it (I hope)

EDIT2: **** it, pm me if you want circuit diagrams...

10. Undies has it right. It's the classic 'staircase' scenario - one switch at the top of the stairs, one at the bottom. Both on == on, both off == on, one off one on == off.

If I had my old BEE notes I'd post the diagram - it's not too difficult to wire.

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