# Thread: Need help - How to connect a 2 pole, 5 way rotary switch to my Leo Bodnar BU0836x card

1. ## Need help - How to connect a 2 pole, 5 way rotary switch to my Leo Bodnar BU0836x card

HI Guys, In order to build my Left EFEIS, I need to connect a 2 pole, 5 way rotary switch (not a rotary encoder) to a BU0836X card. I'm not sure if I'm posting this in the right place and I apologise if I did not. I'm a newb when it comes to switches so if someone could point me to a simple diagram it would be great. Thank you very much.

2. ## Re: Need help - How to connect a 2 pole, 5 way rotary switch to my Leo Bodnar BU0836x card

If you have a 2 pole 5 way rotary switch it means that there are 2 sets of legs. Each set consist of a Ground/GND pin and 5 outputs. (So you can only get 5 outputs)

If you put the switch in "position3" you will get power out of leg number 3 on each set (As long as you have GND connected to both).

Using a 2 pole switch can be an advantage if you need to separate systems to get a signal from a switch.
An example could be that you need one set of signals for the BU0836X-card and the other set of signals (pole) is wired up to some LEDs.

A simple diagram would look like this:

Loop1: GND1-----1---2---3---4---5---X
Loop2: GND2-----1---2---3---4---5---X

The GND-pins are the ones in the middle. The ones in the side are output (1-5) (The 'X' above marks that there normally are a total of 12 pins, so there might be 2x1 "dead pins" on your switch.
When the lever is in position 2 the "output number 2" is connected in both loops. But they not connected, so if only GND1 is connected you will not get a signal out of loop2.