WIP - RacingMat's closed circuit Gseat

i really think the delay was in the flow of air in the small diameter tube...

the sensor was close to the bladder but motor was overreacting because of the delay. It could be fine for other use than simracing which requires reactivity...

but yeah, checking auto-average is a good point
+1 (I had to deal with this issue for an altimeter on a DIY water rocket)

a water rocket ?? what do you do for a job ?

yes water rocket is fun, reusable, not incendiary, ecological (but still dangerous)
it was the student project of my son!

Have you found some pressure pad with larger diameter tube than others?

Hi @blekenbleu
welcome here

Nope, I will have to tinker a DIY way if I want to improve this outflow...

here some researches made some times ago:
https://www.randonner-leger.org/forum/viewtopic.php?id=20666

hand-made heat-sealed airbag


https://gearjunkie.com/sea-to-summit-sleeping-pad-designer

https://imgur.com/gallery/OB891

the 3 types of fabrics : http://www.reparzod.fr/constructions/technique/

https://www.seattlefabrics.com…850-linear-yard_p_37.html

https://www.tricancorp.ca/fr/herculite-no-80m-61-black


https://www.extremtextil.de/


manufacturers in france :

https://www.musthane.fr/nos-so…souples/coussin-lombaire/


https://www.atic.fr/verin-pneu…bturateur-basse-pression/


https://www.pronal.com/contact.php ?


nautical (Germany) : https://www.grabner.com/

So, flow restriction delays and distorts "original signals",
can be somewhat compensated by an old trick called digital pre-emphasis:

• Deploy servos and pressure pads that can displace more air than needed at the seat
• Servo can initially displace a larger (or smaller, when decreasing) value than wanted
• Then servo signals are relaxed to wanted values after some delay, as air transfers nearly complete
• Some initial trial-and-error tuning is wanted to derive best delay and weight values

oh! I knew about PID but not about pre-emphasis: I'll look at it. Thanks

any development with your project ?

How u connect servos and psu to arduino on 7 volt? Do need motor controller?

Arduino has a library to control (by PWM) hobby servos, which have 3-pin connections:

1. ground - connect to servo power and Arduino ground
2. PWM - connect to Arduino PWM pin
3. power - connect to e.g. 7.4 VDC supply, separate from Arduino power.

My 7.4VDC power derives from a 12VDC bulk power supply reduced to 7.4VDC by a buck regulator.
I chose a buck regulator which also limits current (to less than 5A)
and has supercapacitor bank between the buck converter and servo for peak (e.g. stall) currents.
Separate Arduino power is by its USB connection.
Hobby servos do not require motor controllers.

I d

I don't know if I understand well. My English is not so good. Psu connect to external psu port? And serwo to 5v pin?
I have also another problem on game engine I have surge force on axis assignment b and set in tuning center to work only for throttle. But how set sway force on 2 serwos to work like left right if I have 2dof on a assignment? If I set on b assignment like max 3 min 0 it's only work for one side. Is any way to set 2 serwos, one work in minus, and one in plus?

I have a regulated 12v power supply, when it gives 7 volts and connect it as you wrote, nothing happens. Should I set it to 12v and connect a regulator like this?

12V will damage hobby servos.

corrected wiring for your regulator

@noorbeast I think maybe U can help? Maybe a modified arduino code? I have met several times with such ones, but which one should i choose?