Electronics > Projects, Designs, and Technical Stuff
Strain gauge Joystick - Could something like this work?
Leo Bodnar:
I would not say anything. A lot of critical control systems use force sensitive control as opposed to displacement sensitive controls.
E.g. most modern fighter planes.
Humans control forces much better than position.
Leo
--- Quote from: jfitter on January 31, 2020, 07:34:41 am ---... it is almost impossible to control anything with it.
This is why non-gymbal joysticks are NOT used for machine control.
--- End quote ---
MarkF:
--- Quote from: Leo Bodnar on January 31, 2020, 08:51:31 am ---I would not say anything. A lot of critical control systems use force sensitive control as opposed to displacement sensitive controls.
E.g. most modern fighter planes.
Humans control forces much better than position.
Leo
--- Quote from: jfitter on January 31, 2020, 07:34:41 am ---... it is almost impossible to control anything with it.
This is why non-gymbal joysticks are NOT used for machine control.
--- End quote ---
--- End quote ---
Correct.
The force sensitive stick in the fighter moves less than +/- 1/4" at the top of a 12" long stick.
It works surprisingly well. Very easy to control.
jfitter:
--- Quote from: MarkF on January 31, 2020, 02:36:13 pm ---
--- Quote from: Leo Bodnar on January 31, 2020, 08:51:31 am ---I would not say anything. A lot of critical control systems use force sensitive control as opposed to displacement sensitive controls.
E.g. most modern fighter planes.
Humans control forces much better than position.
Leo
--- Quote from: jfitter on January 31, 2020, 07:34:41 am ---... it is almost impossible to control anything with it.
This is why non-gymbal joysticks are NOT used for machine control.
--- End quote ---
--- End quote ---
Correct.
The force sensitive stick in the fighter moves less than +/- 1/4" at the top of a 12" long stick.
It works surprisingly well. Very easy to control.
--- End quote ---
This is by your definition a displacement sensitive stick.
In a fighter the stick must be controlled when under a G loading of up to 9G. Elastomer sticks are the only practical solution.
The MOST precise joystick operators are high level radio control aerobatic competitors. They require a level of precision which is almost super human. The top radios have precision machined gymbals floating on ceramic bearings with 16 bit hall effect angle sensors on each axis. Force sticks have been tried and found unsuitable.
As a past national champ I believe I am well qualified to speak on this matter. You need to actually get out there and do it to understand the practical issues involved - it's called engineering.
Leo Bodnar:
--- Quote from: jfitter on February 01, 2020, 09:27:14 am ---The MOST precise joystick operators are high level radio control aerobatic competitors...
As a past national champ I believe I am well qualified...
--- End quote ---
I am chuffed to learn from the best - thank you for this lesson. :)
Leo
Kilrah:
--- Quote from: jfitter on January 31, 2020, 07:34:41 am ---The problem with simple force sensors on fixed sticks is that there is an output for any force.
--- End quote ---
That's why you use the difference as your input, proper thresholds etc. I did play with FSR-based sticks in the past and had good results for the intended purpose.
--- Quote from: jfitter on February 01, 2020, 09:27:14 am ---The top radios have precision machined gymbals floating on ceramic bearings with 16 bit hall effect angle sensors on each axis
--- End quote ---
Nothing in the OP says he requires such precision though. And having a foot in that field, a lot of what you just touted is just clever marketing :)
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