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Instrument single input channel selector pedal switch
Instrument single input channel selector pedal switch
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Old 2nd January 2019, 08:36 PM   #1
bigfootyancey is offline bigfootyancey  United States
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Default Instrument single input channel selector pedal switch

Hello world,

I'm currently working on a project for a buddy/band-member of mine. He plays 4 instruments (2 banjos, mandolin and a saw); we're currently working on electrifying all of them. Anyways...

What I'm working on is a 4 channel foot switch selector (4 individual "sends"), with one 1/4" input and 4 outs. What I'm having trouble with is achieving the correct "wiring" or schematic that would allow for 1 of the 4 selectors to pass signal at a time. For example, if one of the switches were engaged and then a different one was triggered on, the previous engaged switch would be triggered off.

I have been trying to figure it out on my own, but this is my first project. I've been working with 3pdt switches, but because of the latching, the user of the switcher would have to learn tap dancing; and we just don't have time for that. If I use momentary switches, he would have to keep his foot down the entire performance, and that's the only way he keeps time; and again, we don't have the time for that.

So, I've been looking into arduino based programming to achieve this, but there are two major questions when going that route. One, do I really need an arduino to achieve what I'm envisioning, or is there a way to wire some foot switches that I haven't discovered yet? And two, if the arduino is the route to take, what code do I use to achieve said goal?

Any, and all, advice is much appreciated. Thanks!!!!!

Kevin
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Old 3rd January 2019, 12:20 AM   #2
Enzo is offline Enzo  United States
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Are you sure you don't mean one output and four input?
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Old 3rd January 2019, 12:40 AM   #3
bigfootyancey is offline bigfootyancey  United States
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Yes, I am certain. A 4 foot switch selector pedal with 1 input, and only 1 switch able to be engaged at a time.
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Old 3rd January 2019, 01:02 AM   #4
leadbelly is offline leadbelly  Canada
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Could you say more about the application? It's a somewhat unusual request. A more common request would be more like a 4 output AB pedal, which is not what you're describing.
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Old 3rd January 2019, 02:56 AM   #5
bigfootyancey is offline bigfootyancey  United States
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So, essentially it’s would act like a 1 in 4 out audio splitter, but instead of having 4 lines passing signal, only one line would be passing signal. That one signal would be determined by its corresponding foot switch.

What I’m trying to do is only have one instrument cable for the 4 instruments he plays, and to alleviate the pain of switching on/off 4 different EQ pedals for the desired tone of each instrument. The switches would select which path the signal travels to be hardwired to an old 4 channel audio mixer that already has the EQ customization built in.
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Old 3rd January 2019, 03:01 AM   #6
bigfootyancey is offline bigfootyancey  United States
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I’ve been told to use a series of flip flops when triggered by a SPST momentary foot switch. I’m not quite sure how to use them, and which I might need.
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Old 3rd January 2019, 04:01 AM   #7
PRR is offline PRR  United States
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Three two-way stomp switches minimum. A change may need one or two taps. Probably objectionable.

A rotary sequencing switch. Once common, now rare. Changing from input 1 to input 4 would take three taps, inevitable with fixed sequence.

Same, hacked-up as a cam rotated by ratchet like a motorcycle shifter, working mini-switches.

You could in fact rig a $1 1P4T rotary switch vertical shaft, with a boot-grabber on top. Insert foot, twist leg. Natural interface but very awkward dance, and will need sturdy end-stops so the foot doesn't bust the switch guts.

There are interlocking pushbuttons in 4-gang. Also becoming rare and not suitable for foot-work.

Four separate buttons is the logical user interface, but requires cancelling the other inputs when an input is selected. This "can" be done with pure relay logic, or cheaper with MML relay logic (caps to hold data through transition).

Yes, this can be resolved to TTL/CMOS flip-flops. Suggest you read Lancaster's RTL TTL and CMOS CookBooks. "Counters".

You are probably correct: a CPU. For a total novice, the BASIC Stamp may be easiest to get started, but there is much attraction in arduino or/and that 99-cent controller.

And the golden oldie: four guitars(etc), one cord. Unplug banjo, set down, grab ukulele, plug-in, play.
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Old 3rd January 2019, 04:30 AM   #8
leadbelly is offline leadbelly  Canada
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There is a cheap, easy to source 1P4T switch, every 3 speed ceiling fan pull switch is just that. You'd have to rig a pulley to turn it into a stomp switch. And you would have to cycle to the right channel. Inelegant, but doable.

I do have a 1P2T stomp switch in my parts box, but it would be difficult to source such things nowadays.

Edit: oops, I think a ceiling fan switch is probably only 3 contacts. There goes that idea.
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Last edited by leadbelly; 3rd January 2019 at 04:38 AM.
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Old 3rd January 2019, 07:53 PM   #9
PRR is offline PRR  United States
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I have a feeling this won't work. Idea is that a 4-bit Latch (ganged flip-flops) senses four momentary switches. A common Latch pulse loads the latch ("ST" store).

It latches the states of all 4 buttons. Intent is you only foot one button, the others default low. If you fat-foot 2 buttons, both are latched. This may be a Feature or a Flaw, your choice. (This could be prevented mechanically with tall ridges between switches.)

I have a feeling it will fail due to switch bounce.

I post to excite thoughts from members with more experience in small logic systems.
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Last edited by PRR; 3rd January 2019 at 07:57 PM.
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Old 4th January 2019, 06:39 AM   #10
thoglette is offline thoglette  Australia
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Quote:
Originally Posted by PRR View Post
I have a feeling it will fail due to switch bounce.

I post to excite thoughts from members with more experience in small logic systems.
You'd need a few capacitors + FET to delay and clean the clock. Not what it says on the app note but it'd probably work well enough.

If you've half a brain you'll be able to do this with a handful of relays. (Put "ladder logic" into your favourite search engine if you've never seen this)

You used to be able to buy interlocked selector switches, every cassette player ever made had them. And I'm sure I've seen industrial grade ones, but not for years. If you're handy with metal work, the half press position releases all switches, then the one you're pressing carries onwards into the latched position.

Of course today it has to be done with a PLC running it's own BOOTROM and O/S with a GUI.
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