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Topic: Multipole switch (Read 2 times) previous topic - next topic


Hi all

I'm not sure if this is a standard thing or not, but I'm looking for a switch which will allow any of 3 contacts to join any of the other 3, eg...

A <--> B
A <--> C
B <--> C

I'm actually after a "double pole" version of the above, but I have no idea if it exists or what name it has.

In terms of what I'm trying to acheive, I'm trying to design a board with 2 arduinos on it, but only one header for a single FTDI cable to swap between the two, plus allow the arduinos to talk over the serial connection.

Hope all that makes sense. Thanks in advance!



I have not come across such a switch. Generally you can get multy pole mulity way switches. So it should be possible to wire one of these to get what you want, if you can define it better than you have in the first post.

You can search for the switches here:-


Thanks for the responses.

Essentially what I'm looing to do is have 2 embedded arduinos talk to each other over serial. But they'll need reprogramming in place, so I'd like a header for an FTDI lead on the board. Then, using a switch, I can select one of the 3 options:

- Arduino A talking to Arduino B over serial
- Arduino A talking to FTDI over serial
- Arduino B talking to FTDI over serial

It looks like this is doable with a 4P3T switch, but the ones I've seen seem to be fairly bulky. Guess that's what you get for wanting so many contacts!


It would be best if you could show your usage of such a switch with the circuit they would be used with. However if it's not a switch that needs to be changed often a simple multi-pole single throw DIP switch might work for you. Three of the rocker switches on the dip switch will be called A,B,and C. Wire one side of a,b,c  contacts together and the other side of the three rockers will be your a,b,c contacts to wire to whatever you are wiring to. Then just close whichever two rockers you want connected.



Hi Lefty

I sketched out a quick diagram of what I want to achieve. It allows each of A, B and C to communicate with each other over the serial pins using a 4P3T switch.

Sorry for messiness!

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