Joystick Dual Expression control device?

[Fuzzonaut]

I'm in the middle of a Chaos Machine build that might end up on my table top setup up and seeing the 2 EXP inputs made me think about building a Joystick controlled dual expression (X/Y) thingy. But of course, I don't really have a clue about this.
There is this thing, doing what I want, but DIY ...

So, questions:

1. Joystick: what kind would I need, and where to find that (I'm in Europe)? What range, 10k? Other things to consider?

2. Wiring: how would the wiring work?

3. Options: Would it be possible and/or a good idea to have different ranges (10k/other) available? On a switch (or even use a potentiometer) to make it work with different pedals?

Thanks!

 

[Feral Feline]

I’ve got one similar to this:

Each axis has 3 legs just like a pot;
Both axis on mine are 10k, which is what a lot of expression pedals have.

You could add more resistance in series (resisters or trimmers or pots), but you’d be confined to a small range of the overall amount of resistance.

I like it , as it’s short stubby spring-loaded so it can be controlled with a toe and then it reverts back to stock when done manipulating it. It’s a bit all or nothing though, unless you use your hands, but even then this design is abrupt.

You might prefer a taller stick with a large ball on top for more nuanced control.



Dwarfcraft had a few pedals with joysticks, the bloke who runs it would be willing to give you some info, I bet.



Check out joysticks at RC modeller shops or online.


Walrus has a joysticker, too:

 

[Fuzzonaut]

Thanks @Feral Feline .

How would you connect the 1/2/3 (as in pots) of the joystick axis with the T/R/S of the jack?
Tip to 2, sleeve to 1 and ring to 3?

It will be operated by hand, smooth control would be nice. I'm still not sure, if I want the joystick to stay where it is, or jump back to the middle position, when I let go ....

Maybe I'm overthinking this and should just order stuff and go the try and error route.

 

[Feral Feline]

I was thinking it wouldn’t matter so long as you’re consistent in connections at each end…


BUT!

It’s what’s at the other end that matters, ie what the tip/ring/sleeve are hooked up to in the target pedal’s expression-jack to pot. Follow that path at your DIY-joystick controller. The link you provided indicates expression-control is done in a common way from manufacturer to manufacturer, or the joystick-box builder would have to have a few different versions to cater to the different pedals.

Also, joysticks are probably standardised, too. So use your DMM to crack the Axis code and or look inside the pedal you want to control; I bet it’s pretty consistent sailing after that — if you happen to make a few for yourself and friends.