[PSUBS-MAILIST] Joystick

[Alan via Personal_Submersibles]

Thanks Sean,
sounds like I got my X & Y mixed up.
I don't think I need a yaw motion from the rotation of the joystick as
I get this with a combination of X & Y. The tractor steering on my ambient
works well, & this just has an X & Y axis on the horizontal thrusters. I could
however feed the control through the PLC & put in some logic so that when 
I go nearly full left on the joy stick, the right hand thruster goes in reverse to 
turn the sub on it's axis. 
On my ambient sub I have a separate joy stick for the horizontal thrusters ( PS2 controller ). This is reasonably intuitive but takes two hands, & I want a hand 
free for a camera, HMI or manipulator. 
If I can't find anything off the shelf it may come down to putting a small finger
operated joystick horizontally off the main joystick shaft.
Cheers Alan



Sent from my iPad

> On 27/02/2018, at 11:15 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> I would stick with an intuitive control scheme, and find a joystick with three axes. Forward / back Y axis corresponds to ahead / astern propulsion (surge), left / right X axis corresponds to straight lateral motion (sway), and rotating the stick clockwise or counterclockwise around the Z axis corresponds to turning (yaw) motion. Three axis sticks are pretty common industrial controls, although I don't know about meeting your budget. For depth control (heave), you could use a stick with an additional thumb wheel or accessory axis, or make use of a simple switch, but ramp the output in proportion to how long you hold the digital state changed. You could also have a button which toggles e.g. your stick's Y axis between surge and heave control modes. Wanting single stick control limits your options a bit, unless you're also using a PLC / PAC, in which case you could use joystick buttons just to jog your depth setpoint, and rely on other code to actually implement an associated control algorithm.
> 
> Sean
> 
> 
> 
> Sent from ProtonMail mobile
> 
> 
> 
> -------- Original Message --------
> On Feb 26, 2018, 14:48, Alan via Personal_Submersibles < personal_submersibles at psubs.org> wrote:
> 
> Should mention that the buttons or whatever for the vertical 
> thrusters will have to be analogue to give me speed control, 
> & not on & off. 
> Cheers Alan 
> 
> Sent from my iPad 
> 
> > On 27/02/2018, at 10:36 AM, Alan via Personal_Submersibles wrote: 
> > 
> > Am looking for a semi industrial or industrial joystick for controlling 
> > 4 thrusters; two vertical, two horizontal. 
> > I want to operate it with one hand. The X axis will be the horizontal thrusters 
> > throttle forward & reverse, the Y axis is the horizontal thrusters proportional 
> > speed for turning ( pretty standard ). The vertical thruster control is what I 
> > am having trouble with; I want it to be as intuitive as possible & have seen 
> > buttons on joystick shafts that could be used for up & down. In the attached 
> > picture the buttons are on the top of the shaft in the left hand example. 
> > I am also wanting the unit pretty small, so small intuitive, one handed operation. 
> > It doesn't matter if there is a few extra buttons as I could use these for lights 
> > or display control etc. 
> > If anyone knows of anything, or has a better solution, I would be interested 
> > thanks. Oh yeah, & not really expensive! 
> > Alan 
> > 
> > 
> > 
> > 
> > Sent from my iPad 
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