[PSUBS-MAILIST] Speed controllers

Sun May 8 16:06:00 EDT 2016

Pete, the potentiometer taper for the MK-101 controller card is a 1K
ohm, linear with a 0-240 deg range.

cliff

On Sun, May 8, 2016 at 8:39 AM, Pete Niedermayr via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Anyone know the taper of the MK pot ?
>
>
> ------------------------------
> *From:* Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Saturday, May 7, 2016 10:25 PM
> *Subject:* Re: [PSUBS-MAILIST] Speed controllers
>
> Alec,
> some joy sticks have the " click to center" option, where it doesn't
> spring to
> center but clicks into a slot & requires more force to move it out.
> This was one of the configurable options Apem offered from memory.
>    I would have thought a potentiometer type joystick would be as easy to
> implement as any other control. What sort of input does the Minnkota
> controller
> require?
>    I am not 100% following you, but if you are having controls out the
> side of the
> box, you could have two joysticks with X&Y axis out either side,  & you
> would then
> turn the sub like turning the handlebars on a bike & push the other axis
> up to go up
> & down for (you guessed it) down. Crabbing you just lift up on one side &
> down on the other.
> Cheers Alan
>
>
> ------------------------------
> *From:* Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Sunday, May 8, 2016 2:30 PM
> *Subject:* Re: [PSUBS-MAILIST] Speed controllers
>
> Oh wow, Pete, you put way too much effort into that! Actually I have yet
> another evolution of this if I haven't tired you all yet. I like the
> joystick concept but its hard to implement satisfactorily without any
> signal processing. I also like the "tractor control" paradigm for the stern
> thrusters, but not so much for the side ones. Regarding the issue of spring
> return, I think that is intuitive for a joystick but the opposite is true
> for the "dual throttle" method. The latter is exactly like double
> throttling any boat - who would want to have to hold the throttles the
> whole time? So here's the new variant...
>
> The rear thrusters will be controlled using tractor control using two pot
> handles coming out the sides of the box as mentioned earlier, but for the
> side thrusters we have two controls on the box surface. One is a speed
> control (knob, thumb-wheel, whatever) that controls the speed of *both*
> side thrusters. They will always run at equal speed, as they did on Snoopy.
> Next to it is a three position toggle switch. The center position is
> labeled "normal" and in that setting both side thrusters pull the same way.
> The left position on the toggle is labelled "Crab L" and what it does is
> reverse the polarity of one thruster, causing the boat to crab left.
> Likewise the right position is for crabbing right. Ninety percent of the
> time the toggle will live in normal mode and the controls are reduced to a
> bare minimum - two throttles for steering in a horizontal plane plus the
> "depth knob". It passes the test of being drive-able by a 5 year old. But
> the crabbing function is still there if you need it, for instance, for
> maneuvering onto the trailer. With this, finally, I think there is
> something that is just as easy to use as a joystick, yet also adheres to
> the KISS design philosophy of the boat.
>
>
> Thanks,
>
> Alec
>
> On Sat, May 7, 2016 at 7:14 PM, Pete Niedermayr via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
> What about something like this.
>
>
> ------------------------------
> *From:* Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Friday, May 6, 2016 10:43 PM
> *Subject:* Re: [PSUBS-MAILIST] Speed controllers
>
>
> I'm a proponent of spring return joysticks also.  I considered
> non-return ones early on but rejected them just on a perceived need
> (real or not) to have them quickly return to a dead zone instead of
> fumbling to find that dead zone if I was in a hurry to stop propulsion.
> Assuming there's no throttle feedback to indicate where center is,
> you'll need a relatively large dead band (or zone) to not overshoot the
> center position.  I've never been a fan of Z-axis though because I
> personally do not find them comfortable or user-friendly even with a
> large joystick for a computer.  There's something about twisting motion
> that is fatiguing and this would be especially true on a small diameter
> joystick.
>
> The degrees of joystick movement is not as important as the
> potentiometer value controlling the signal to the controller.  You can
> find joysticks with different potentiometer values to get the fine
> control you need.  The more expensive joysticks use hall sensors (I
> believe) to get past this issue.  One problem I see with a mechanical
> KISS approach for components is that the UI ultimately begins to
> suffer.  Instead of one or two joysticks, extreme KISS requires four to
> accomplish tractoring and crabbing which means both hands on controls.
> I think potentiometers in this configuration are going to be less
> intuitive and more complex to operate, relatively speaking, than
> joysticks.  Think Etch-a-Sketch, and I was never good at that.
> Mechanical KISS ultimately equates to more buttons/levers/switches than
> a fly-by-wire design.  Yes, at a component level mechanical KISS has the
> benefit of being able to target a single switch for replacement but
> nothing is free and the UI becomes more complex because the user has to
> control multiple components simultaneously to perform a certain task.
>
> Back to the Z-axis, I think if I were to use one I would give up
> crabbing and use the Z-axis simply for vertical movement.  Twist left
> for down, right for up.  I'm not sure there is a lot of use for crabbing
> in something that is not a Deep-Worker type vessel, but I do plan on
> implementing it for my sub.
>
> Jon
>
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