Does maximising end points give a better resolution?

[ched]

OK so having a discussion with an experienced pilot the other day and he suggested that by increasing the endpoints as far as possible you would get better resolution!

This got me thinking. The tx/rx system is analogue controlled by potentiometers. The flight controller is a computer so converting analogue in to digital to analogue out. So in theory having end point set to say 120% will give the FC a slightly bigger analogue voltage to work with but the output can still only give out servo signal levels.

Anyway I don';t understand tx/rx enough to know if making end points as big as possible will make any difference.

Anyone any ideas?

[Revs]

Interesting question. Maxing the end-points will increase the resolution at the FC/RX end but won';t increase the resolution at the sticks (potentiometers in the TX). If you';re running a TX with a high res (4096?) I suspect you';ll gain actual resolution.

This can be tested though. In your FC';s GCS you should be able to see any increase in resolution in the ';receiver'; tab. Just move your trim say 10 clicks and see what that translates to. Then do the same after you';ve played with your end-points to see what difference it';s made. You may find that you get the same res but the reading are just bigger at full stick. I suppose it also depends on how your FC is set up.

[PaulJC]

Revs has nailed it, the limitation is not really the pulse generated but the potentiometer on the sticks, these are still pretty crude, basic and low budget components...

[guest325]

This explains all as applied to model aircraft:
http://www.modelairplanenews.com/blog/2012/02/09/total-control-the-right-way-to-set-up-servos/

[ched]

Been having more of a think. Openpilot does a calibration on stick movements so maximising end points would make no difference to the FC.
So normally on my tx there is a difference of about 1000 between min stick and max stick. So in theory, say 90degree stick movement means 0.09 degrees of movement per signal unit. But if I increase min and max end points to give 1040 between min and max means about 0.87 degrees of stick movement per signal unit.

So in theory setting as large as possible end points gives slightly finer control. But I very much doubt anyone could feel the difference in a bind test.

[Revs]

But if your TX only has a 1024 resolution (which I assume means 500 either way, not sure) it won';t make any difference.

[Yellow]

Im glad this was brought up, i was just wondering about this while setting up my hex. Thanks for the clarification

[ched]

But if your TX only has a 1024 resolution (which I assume means 500 either way, not sure) it won';t make any difference.

Good point, I will have to check this out, thanks. I will report back