I decided to take a look at Chris Rosser’s YouTube series on ArduPilot Tuning.
In his tutorial, he steps through using an RPM Notch filter using ESC (BDshot) telemetry - and includes settings for RPM1_TYPE and RPM1_ESC_MASK parameters.
In the wiki about ESC based RPM notch filters, there’s no mention of these parameters.
Am I missing something?
Thanks!
Different FW versions have different parameter names.
We do improve parameter names on newer releases.
Ok - so the wiki has old parameter names that are no longer used?
What are the old parameter names that the wiki is using - so I can match everything up.
And what’s the best way to request that the wiki is updated?
I’m wondering if the out of date wiki was the reason I had trouble with the ESC/rpm harmonic notch filter. Maybe others did too.
What’s odd is that following the wiki and using the web filter review tool, things seemed to be working ok.
Maybe it has something to do with raw gyro log. I got oscillations when I enabled this - and Chris Rosser’s tutorial isn’t using the raw gyro log.
raw gyro log is only advisable on really big drones with big props and H7 processors.
Again this is something AMC automatically does for you: if the two conditions mentioned above are not meet, it falls back to batch logging. How big are your props?
It seems there are two places in the log for RPM data. One is by ESC, and the other appears to be an aggregate.
On my first maiden flight (right side of the screen shot) - I didn’t have RPM1 enabled - and the RPM data is logged for each motor under each ESC. No RPM1 data is logged or available.
On my “2nd” maiden flight with RPM1 parameters enabled, there is now a new RPM1 value in the log - that looks like an aggregate value of RPM. (Left side of the screen shot)
Do you have an H7 processor?
How big are your props?
Cube orange - 10" props.
Props are too small, switch to batch logging, disable raw gyro logging
I’m sorry @amilcarlucas - you’ll have to provide more info - I need to know why.
As info - this is the exact same quad I worked through a week or two ago - I just reset it and I’m starting from scratch. (450 class frame using the same drive train used on a Hexsoon EDU-450 - it’s just lighter)
I’m following Chris Rosser’s tutorial, and in his example he’s using a quad with 7" props.
I’m still working my way through Rosser’s tutorial, so at some point he may direct using raw gyro logging. But since when I tried that before (same quad) I got oscillations when I just enabled gyro logging (no filter, just logging) - it seems like a good idea to avoid that if I can.
The RPM parameters are completely wrong! Oh dear.
I have asked him to correct this.
I’m sorry @jstroup1986 but like I told you 3 times already: the information on why things are like they are is on the documentation that I provided you with
Can I help?
I’m going through Chris Rosser’s YouTube tutorial on ArduPilot quad-copter tuning.
Just going through the first couple of videos on the series I’ve seen several things that might be good to clarify. As a lot of people may be using this tutorial, I’m thinking of writing a technical article on my website to supplement Rosser’s tutorial.
Interesting info on your Github page.
I’m following the ArduPilot wiki at the moment.
My settings for log_bitmask includes the “Fast IMU” bit.
Good point, I need to update that outdated screenshot, Peter Hall told me specifically to not activate that bit. I have updated the software, but not the screenshot. Thanks for the heads up.
@iampete - could you please share about using the “Fast IMU” bit in the LOG_BITMASK parameter?
I’m going through Chris Rosser’s youtube tutorial on Ardupilot copter tuning - and he doesn’t mention excluding it. I’ll suggest he correct this if it’s a problem.
Thanks!
I don’t have any strong opinions on “Fast IMU”, just leave it at default.
The key thing is not to check “Raw IMU” and rather use the new " INS_RAW_LOG_OPT".
I have also seen those series of Chris. I did not get why he had enabled both rpm sensor and esc sensor as esc sensor is enough to do the notch filtering?
It’s just plain wrong. I have asked him to fix but no response.
