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three way SWITCH in Eagle
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author three way SWITCH in Eagle
wahee
hi all

I am designing a switch system and need three inputs into one output

I have a toggle switch with 3 positions.
I can switch 2 positions ok
is there any way I can use the centre pin to have a third input.

I can do this with wire but I was wondering how to manage it in eagle, as I can't seem to find a way to connect the wires in any of the switch libraries I have.

I was hoping for an INPUT C straight down the middle , if that makes sense

Sorry if this is a dumb question.



yes I think this is daft as the centre pin is always connected so there is no way to 'switch' it to anything. I guess I need a 4 way switch. Just getting confused d'oh!
Altitude909
3 pins = 2 inputs + 1 output

you need a 4 pin device
revtor
You can create a part, it’s symbol, and it’s footprint. Then you connect the symbol pins to the footprint pads however you want.
Make sure to “use” your new part so it shows up when you “add” a part to your schematic

There are videos for this
chuckg
You can use a "DPDT ON-ON-ON" switch, and wire it to behave as a DP3T switch. Here's one example. Ignore the confusing comments - they have mixed it up with a DPDT ON-OFF-ON switch, which is not what you want.

https://forum.digikey.com/t/wiring-a-dpdt-switch-to-act-like-a-sp3t/92 4

In this diagram, the common pin is at the center on the right. The three poles are: top left; bottom left; bottom centerish.
wahee
Ahh that's really good. That might just work if I can get some ON ON ON switches. I see how it's wired and I think that hopefully I have it right in this latest iteration:

wahee
chuckg wrote:
You can use a "DPDT ON-ON-ON" switch, and wire it to behave as a DP3T switch. Here's one example. Ignore the confusing comments - they have mixed it up with a DPDT ON-OFF-ON switch, which is not what you want.

https://forum.digikey.com/t/wiring-a-dpdt-switch-to-act-like-a-sp3t/92 4

In this diagram, the common pin is at the center on the right. The three poles are: top left; bottom left; bottom centerish.


thanks for this!
cslammy
wahee wrote:
hi all

I am designing a switch system and need three inputs into one output

I have a toggle switch with 3 positions.
I can switch 2 positions ok
is there any way I can use the centre pin to have a third input.

:


Hi Wahee
I am pretty new to this forum and can help out--karma, I hope.

after years of DIY/PCB fabs I feel I am OK at eagle.

Modifying a 2x PCB switch--DPDT, SPST, etc to 3x is pretty easy in eagle. If you let me know the size/spacing of the drills (a lot of time they are based on 100mil/2.54mm) and roughly the size pads you need I can create an LBR file and PM it to you. Or if you have a datasheet link that, they always have pad spacing info, or you can PM me if you want.

Also I have a blog post on how to modify eagle parts w/ some basic how-to links if you want to try it yourself--it took me a bit to get the hang of creating and editing EAGLE parts but once the skill was under my belt it changed my approach to DIY.

https://audiodiwhy.blogspot.com/2018/06/9mm-pots-creating-eagle-librar y.html
EATyourGUITAR
wahee wrote:


nope
wahee
EATyourGUITAR wrote:
wahee wrote:


nope


It's maybe just the limitations of the eagle footprint I have, it can't show ON ON ON.

This should be better:

EATyourGUITAR
https://www.diymodules.org/eagle-show-object?type=std&file=switch.lbr& symbol=DS-A203
wahee
cslammy wrote:
wahee wrote:
hi all

I am designing a switch system and need three inputs into one output

I have a toggle switch with 3 positions.
I can switch 2 positions ok
is there any way I can use the centre pin to have a third input.

:


Hi Wahee
I am pretty new to this forum and can help out--karma, I hope.

after years of DIY/PCB fabs I feel I am OK at eagle.

Modifying a 2x PCB switch--DPDT, SPST, etc to 3x is pretty easy in eagle. If you let me know the size/spacing of the drills (a lot of time they are based on 100mil/2.54mm) and roughly the size pads you need I can create an LBR file and PM it to you. Or if you have a datasheet link that, they always have pad spacing info, or you can PM me if you want.

Also I have a blog post on how to modify eagle parts w/ some basic how-to links if you want to try it yourself--it took me a bit to get the hang of creating and editing EAGLE parts but once the skill was under my belt it changed my approach to DIY.

https://audiodiwhy.blogspot.com/2018/06/9mm-pots-creating-eagle-librar y.html


hi thanks for the help. I use the 320-938 switch from the switch library.

I have been kindly provided with the symbol but just have not got the knowledge to change the switch for another contact. If you can be bothered, it would be really cool:)
wahee
EATyourGUITAR wrote:
https://www.diymodules.org/eagle-show-object?type=std&file=switch.lbr& symbol=DS-A203


Thats what I need, I just need to adapt it for a toggle switch footprint now
cackland
wahee wrote:
EATyourGUITAR wrote:
https://www.diymodules.org/eagle-show-object?type=std&file=switch.lbr& symbol=DS-A203


Thats what I need, I just need to adapt it for a toggle switch footprint now


Be sure to let us know the result smile
wahee
just as an update. I decided to use a 3pdt on on on slide switch.
Much easier to work with. thanks for all the input on this however
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