91

General Discussion / Re: Dshot instability in 16.09+r782?

« Last post by TheOtherCliff on June 20, 2022, 07:34:55 pm »

If motors increased speed when you banked, then it sounds like CruiseControl was directly or indirectly (through some flight modes or thrust modes) being used.

You say that on Manual thrust mode it now flies a long way without gaining or loosing altitude.  On Manual thrust mode, if you hover and find the throttle for that, then when you bank away (say bank angle 30 degrees or more) and keep the bank angle it will loose altitude and you will have to add a little throttle.  Maybe your bank angle is very small because you are flying gently, not zooming away fast?  Oh well, good to know you have it set where you like it now. 

92

Applications - Autonomous Flight / Re: homeleash cause a config error

« Last post by supermax on June 20, 2022, 12:07:58 pm »

Thank you very much for your detailed answer!
I'm using a 16.09+r782-g8c101ad on win 10 laptop. Now i'm working on a Debian 11 computer and can't do any trial.
I will look for a location where drone can move around freely. The gps position move on the map (google satellite is not displayed) more than 20 meters around even if it is steady on the ground. I suppose my gps is a fake M8n.
As soon as possible i will post the results of my trials.


 

93

General Discussion / Re: Dshot instability in 16.09+r782?

« Last post by Marico on June 20, 2022, 11:16:03 am »

When hovering or flying level and then you bank fairly steeply, you (using Manual thrust) or the FC (when you have it configured to use CruiseControl) must increase the throttle, or the quad will loose altitude.

On the previous config setup I always had to *reduce* throttle because of climbing during banks (motors significantly increased speed) . I can't get rid of that and I just used to reduce the throttle. Now it was very surprising for me that quad perfectly maintains the same altitude  during banks without touching the throttle. In the previous setup I tried flying with CruiseControl  which a bit reduced that climbing but not much. But to maintain the stable altitude I had to use AltitudeVario or AltitudeHold mode. Now altitude is stable in manual throttle mode without any GPS modes in fly mode switch settings (only INS13 is selected in attitude estimation algo). I'll test it further, l wonder if in basic (complementary) mode is the same. Of course the previous setup has differ props (5x3x3, now 5x4.9x3) and motors (2204, now 2207) but I doubt this had such impact for altitude stability.

When you bank steeply, with no throttle stick change, can you actually hear the motors spin faster at the steep bank angle?

No, I can't.  Now they are "quiet", no audible changes in motor rotation. Quad just gently banks and fly on the same altitude for long distance (as far I can see to safe control it). In the  previous setup there was audible increase od rotation and quad increased altitude.
To be honest I'am very happy with this now but still wonder which settings (or hardware change) had impact on it.

I

94

General Discussion / Re: Dshot instability in 16.09+r782?

« Last post by TheOtherCliff on June 20, 2022, 08:47:16 am »

With Manual throttle, the average motor speed (stabilization still causes some motors to be faster and others equally slower) is exactly what the the throttle stick says.

When hovering or flying level and then you bank fairly steeply, you (using Manual thrust) or the FC (when you have it configured to use CruiseControl) must increase the throttle, or the quad will loose altitude.

When you bank steeply, with no throttle stick change, can you actually hear the motors spin faster at the steep bank angle?

The only things I can think of that keep the quad from descending when you bank steeply are:
- you only bank steeply for a very short time
- CruiseControl or some other flight mode (all GPS flight modes) or thrust mode (ALtitudeHold or ALtitudeVario) that uses CruiseControl internally is being used

95

General Discussion / Re: Dshot instability in 16.09+r782?

« Last post by Marico on June 19, 2022, 10:30:28 pm »

OK. after some testing (and re-configuring after settings loss) think I got quite nice stability in 4S,  QuickSmooth helped a lot.
That unexpected data reset has a good sides, too. On the previous settings (on attitude stabilization) during pitch forward or backward quad always climbed up, regardless of throttle settings manual or cruisecontrol, even on cruisecontrol banking was always with increased altitude. Now (on default settings) even on manual throttle quad preserve altitude even on manual throttle and high pitch angle. Which option has impact on climbing during pitch forward/backward with manual throttle settings?

96

General Discussion / Re: Serial Receiver options

« Last post by TheOtherCliff on June 18, 2022, 08:34:20 pm »

I just picked up a quad nearby to check and it has a FrSky X8R in it (connected to FC with SBus).  Certainly the X6R would work and would have more than 6 channels available on SBus.  I would bet that any FrSky SBus receiver that you use would work fine.  Some small receivers don't even have the PWM connectors any more.

97

General Discussion / Re: Trouble configuring bluetooth dongle. chinese knockoff HC05/06 style

« Last post by TheOtherCliff on June 18, 2022, 08:18:25 pm »

My problem with Bluetooth has been that different brands of dongles that are supposedly compatible actually have different commands.  Finding the instructions that match the dongle is difficult some times.  Also, for my setup, I had to reconfigure it each time I wanted to use it.  I should try again with the helpful instructions here on the forum.

98

General Discussion / Re: Sudden configuration loss (revo)

« Last post by TheOtherCliff on June 18, 2022, 08:11:58 pm »

Anyway thanks for pointing out, that something wrong in config could hard reset the board.

The settings are there, but you have to follow procedure mentioned earlier to clear the bad setting and get the rest of the settings back.

Does "export UAV settings" save whole settings/config (just in case if again something went wrong with the config)...?

It does, but there are two buts:
- the FC must be booted normally, not in failsafe mode (like after 3 reboot attempts fail) (I think)
- when doing this via OpLink telemetry, it does not save the Revo class OpLink settings correctly.  It saves the GCS OpLink settings in with the rest of the Revo settings.  I consider this a bug as it used to (before 16.09) save the Revo OpLink as one would expect.  It works as expected if the FC is connected with USB.

99

General Discussion / Re: Serial Receiver options

« Last post by trust on June 18, 2022, 08:34:27 am »

Great! Sounds like Frsky is the way to go, since it works already. Any recommended sources? I assume they all are 8 channels or more? With serial its so easy to have as many channels as you want.
Thanks.

100

General Discussion / Re: Trouble configuring bluetooth dongle. chinese knockoff HC05/06 style

« Last post by Marico on June 18, 2022, 01:08:00 am »

I use HC-05 for connecting to my RC transceiver (SIYI FM30) which has a separate uart channel accessible locally  only via bt. So it could act as a bridge between radio and the GCS. I spent almost a week trying to connect HC-05 to the FM30. I had no problem connecting to FM30 from the phone, pairing was always successful with pin 1234 (pin is required by FM30, is mentioned in the manual). The goal was let the
HC-05 (in master mode) automatically connects to FM30, but HC-05 always refused to bind and connect. In desperate mode I tried with pin 0000 and voila! It worked! Let me someone explain how pin 0000 worked when manual says it should be 1234 and 1234 works when connecting to from other bt devices to FM30?? Any way, I always say BT is the worst wireless technology ever invented.
Some useful details about HC-05 and it clones: it has two working modes: "normal" (act as transparent serial bridge)  and config, when it accepts AT commands. Config mode is active when HC-05 is booted up with pressed button (button could be released after entering config mode), serial speed in config mode is always 38400, normal mode could have different serial speeds (configured with at+baud= command). Some at commands are available only when button is still pressed. Some clones don't accept ending the command line  with /r/n, only /r.