# 7 position switch, only one position active at a time?

I am wiring a 6 channel camera switcher (http://www.brandmotion.com/360-vision/blind-spot/6-way-video-switcher-9002-6118.html)

And in addition to the automatic triggers (there are 6 trigger wires, when one receives 12v, it switches to that camera) I want to add a manual switch. I've looked and looked for a 7PST (I think thats the term) ideally in a push button format (7 individual buttons) but I cannot find anything.

So my question is either 1) do these switches exist? or 2) How can I wire 7 individual switches so that only 1 circuit/switch can be putting out 12v at a single point in time?

• I've seen rotary switches like that, but no interlocked pushbuttons that weren't already installed in some piece of equipment. You might try to scrounge some, or you might do some googling with that term and see what you find. – AaronD Jul 6 '17 at 1:21
• What you want can also be done with momentary buttons and relays, and can have lights added to indicate where it is (because the buttons won't). It's basically the same concept converted from a mechanical interlock to an electrical circuit, but that might be more complexity than you want to tackle. – AaronD Jul 6 '17 at 1:25
• how would the relays communicate to each other to only allow one "talking" at a time? I only see the need for relays if using momentary switches, but still doesn't address the need for only one active at a time – JBlake Jul 6 '17 at 1:34
• It might take some creativity and maybe two stages of relays to make it work, but the idea is that each relay latches itself on while simultaneously blocking all of the others. For example, a button could force its own relay on regardless of anything else; otherwise each relay is held on via all buttons released AND its own contacts closed. Technically, this arrangement could end up with multiple relays latched on, but only if you release their buttons at the exact same time compared to the relays' switching speed. Mechanical interlocks are actually easier to get "stuck" like this. – AaronD Jul 6 '17 at 1:45
• But like Michael says, your best bet is probably a microcontroller that you can hook up buttons and relays to, and let the software do the work. I know you said you're not good at them, but they're so mind-bogglingly useful that it's really a good idea to learn. For example, I started out designing an analog circuit to automatically reset a Pi as part of a custom battery backup, just to be sure it was on when I wanted to use it. After getting mildly frustrated with the one little sub-feature that just would not work, I switched to an 8-pin uC with internal clock. Worked beautifully! – AaronD Jul 6 '17 at 1:56