Lux or Rewrite?

[Roland Sausage]

I';m ready to update the Naze I';ve transplanted to a new build and not sure whether to set up with Luxfloat or Rewrite.  It hasn';t been touched since last year and has 1.1.10 on it with pretty much default lux PIDs.

I';ve joined the new Betaflight group on facebook which has been helpful and also looked at the latest changelog for 2.5.0 but I';m not really any better informed.

Any thoughts or advice on which controller to use would be appreciated 

[Gandhi]

I don';t think there is a lot between them now. I';d try both personally. you can set them up on different PID profiles and switch between them when landed. Fairly easy to do a back to back comparison then.

[DarkButterfly]

I use lux on betaflight, but as gandhi said test them both

[atomiclama]

I run LUX on a CC3D very nice now.

Why ? I can follow the code easily in LUX as it';s not doing lots of jiggery pokery to try and do the same in integers

[Cheredanine]

About 3 or 4 full releases ago Boris stated there was no appreciable difference between rewrite and lux, however since the PID incrementals were smaller on rewrite it gives you more granularity on tuning, hence rewrite was (marginally) better.

Whilst he was playing with 2.4.1 he tried out mw2.3 and was impressed, I think he is pushing getting that working well ATM

In RC 4 I and one or two others have found the stock PIDs for rewrite were not as good as those for luxfloat so as of RC4 have gone back to luc

[atomiclama]

however since the PID incrementals were smaller on rewrite it gives you more granularity on tuning, hence rewrite was (marginally) better.

This is true if you are using the GUI configurator, which is limited.

If however you use the CLI then you have full float granularity in the terms. So LUX is just as tune able.

[nub]

i use rewrite, might have to finally give lux a try seeing as it seems to be so popular

[Roland Sausage]

Luxfloat it is then...for now 

I';m not sure my fingers would benefit from the finer grain control of smaller PID increments and I';ve no idea what I';m doing in CLI anyway!

Thanks for the info and pointers folks!

[Revs]

Lux, tis smoother

[atomiclama]

I';m not sure my fingers would benefit from the finer grain control of smaller PID increments and I';ve no idea what I';m doing in CLI anyway!

you might not need to change the defaults anyway. I haven';t

I only have a little wobble on hard turns into propwash to sort out, but I prefer to fly so just live with it  ::)

[Gandhi]

Lux, tis smoother

Yeah, I get that impression too. It doesn';t play quite so nicely on my v-tail though, which is odd.

[Roland Sausage]

I';ve just flashed 2.5.0 RC4 and now the 3D model quad on the Cleanflight configurator setup screen no longer moves?!  I';m sure I saw this mentioned but can';t remember where.

My gyro and acc are working fine according to the sensors tab.

[Cheredanine]

Rc4 has a bug where bb logging and acc don';t work even if enabled.
Wait for rc5 or take dev build 225
Ps and hike your processor speed up, I have a lux running 8khz/125 loop time and it is excellent

[Roland Sausage]

Rc4 has a bug where bb logging and acc don';t work even if enabled.
Wait for rc5 or take dev build 225
Ps and hike your processor speed up, I have a lux running 8khz/125 loop time and it is excellent

Thanks, I';ll probably hold off for RC5.

I';m not sure how to overclock my naze but I';ll get looking into it 

[nub]

think he';s just talking about upping the looptime, sure the naze can run at around 4khz/250 now, would have to check.

[Cheredanine]

Rc5 is out, acc is fixed.

Release notes tell you what speed the board types can run at

[nub]

i';ve just been told by someone that lux can damage your FC

so ya better watch out!

[Cheredanine]

i';ve just been told by someone that lux can damage your FC

so ya better watch out!

yeah when you are not looking it creeps out and hits the gpu with a hammer

[nub]

witty though not sure if they meant directly but i have asked them to explain what they meant, wonder if they will reply stupid useless support, never the hardware at fault is it.

[Cheredanine]

Lux is just some math. It isn';t going to damage your processor, in fact on f3 boards the gpu doesn';t even do the math as it has a separate floating point unit that does it
Whoever is telling you that is either pulling your leg or doesn';t understand

[nub]

clutching at straws comes to mind.

[Roland Sausage]

I did recently see someone commenting about the micro oscillations produced by Luxfloat and how it can lead to a lot of excess motor heat.  Is that still the case?  I thought it was worked out a long time ago.

[atomiclama]

That was an old thing, all sorted now

[Roland Sausage]

think he';s just talking about upping the looptime, sure the naze can run at around 4khz/250 now, would have to check.

You';re right about that according to Boris release notes.  I';ll give it a go.

[Cheredanine]

Naze can not handle 4K with acc enabled, and suspect will also struggle with luxfloat

[nub]

good excuse for a new FC Roland hehe ::)

[Roland Sausage]

Naze can not handle 4K with acc enabled, and suspect will also struggle with luxfloat

Do I have to switch off acc manually via CLI or is it disabled when looptime is set low enough?  When I go below 1000 the 3D model in cleanflight config stops working.  I can still arm and throttle up though.

What do you suggest?

[Roland Sausage]

good excuse for a new FC Roland hehe ::)

A new FC would be wasted on me! 

[atomiclama]

Do I have to switch off acc manually via CLI or is it disabled when looptime is set low enough?  When I go below 1000 the 3D model in cleanflight config stops working.  I can still arm and throttle up though.

What do you suggest?

If you do it via the GUI then it is taken care of for you, I think.
Venture into the CLI then it';s up to you to disable everything needed, but you more control over it and it';s easier to break.

If the model stops moving the ACC is disabled.

[Roland Sausage]

Do I have to switch off acc manually via CLI or is it disabled when looptime is set low enough?  When I go below 1000 the 3D model in cleanflight config stops working.  I can still arm and throttle up though.

What do you suggest?

Just found the answer in the RCgroups thread - I see you were having a good chat with Boris.  Looks like acc is automatically disabled below looptime of 1000.

You reckon it';d still struggle on Luxfloat with acc disabled?