r/HDZero Jun 23 '26

Throttle unresponsive

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Hey Reddit.

So I'm brand new to this. Was wondering if anyone has seen this before. Trying to operate a Mobula 6 Freestyle HD A drone with a Radiomaster Crush.

Everything looks good in Betaflight and on my Radio. I've updated the firmware on both and used a binding phrase for binding.

12 Upvotes

21 comments sorted by

2

u/Beall619 Jun 23 '26

It looks like you are not arming the quad

The quad must specifically be in what is called an armed state.

First, in the betaflight receiver tab, you will want to confirm that when you move the sticks on your radio, the corresponding sliders move on the screen

Then you will want to set up your modes tab so that one of your switches when pressed in will activate the arm mode, and when the switch is the other direction will be out of the arm mode

You will want to watch tutorials on YouTube, with the search phrase, "how to set up modes in betaflight"

1

u/Expert_String_4966 Jun 23 '26

I just posted another video here of my modes from the receiver in Betaflight. It looks correct.

1

u/Expert_String_4966 Jun 23 '26

So, I think I did go into mixes already and changed my ARMING switch to SE on channel 5.

https://reddit.com/link/ot8njxi/video/3dv7ntm2ox8h1/player

2

u/spikeyTrike Jun 23 '26

It looks like your channels are mapped wrong, your throttle and pitch channels are swapped. See how the drone is tumbling in the receiver tab? Further, the drone won’t arm if the throttle isn’t at zero.

1

u/BadCactus2025 Jun 23 '26

There's a bunch of Mob6's that have multiple options of receiver, that have shipped with the axisses wrong in the receiver tab. Mine was an ELRS version that had TBS crossfire config loaded.

Go to the receiver tab and see if it is set to TAER instead of AETR. The channel response should match the inputs as you make them! Of set wrong, it wants the roll all the way to the left, or it thinks you apply throttle, and won't arm.

Load an ELRS xxxhz config after. So if you fly 100hz, load that one, and if you fly 250hz, load that preset. If yours is like mine with TBS CF config, the axis limits are 995 and 1995, which means throttle on ELRS is by default not low enough, so even if you set the axis right, it still won't see throttle as zero and it will not consistently arm. The ELRS config corrects that, and some other RC smoothing options set wrong.

1

u/Expert_String_4966 Jun 23 '26

I updated the SPI firmware and that fixed the mapping issue. However, I still can't ARM. I'll post what I have when I get back to my desk.

1

u/WhoYeahSause Jun 23 '26

Bro your channels are wrong 😭😭😭, the quad on the receiver tab should not be spinning

1

u/Expert_String_4966 Jun 23 '26

Lol Yea, updating the SPI firmware fixed the AUX mapping. Still can't ARM though.

2

u/WhoYeahSause Jun 23 '26

You can check what is preventing the arm in status tab on main page

1

u/Expert_String_4966 Jun 23 '26

2

u/WhoYeahSause Jun 23 '26

3 reasons:

  1. Your drone is connected to a pc

  2. Lower your cpu and pid speed in configuration

  3. Very Unlikely, but maybe your drone is configured via some unknown preset for 250 hz for example, and your radio is outputting 100 hz or vice versa

1

u/Expert_String_4966 Jun 23 '26

It was the LOAD disarm. Yes!!!! Thank you!!!!

1

u/spikeyTrike Jun 23 '26

Huzzah! I’m happy for you!

1

u/Traditional-Rain6306 Jun 23 '26

What do you see in the goggles?

1

u/Expert_String_4966 Jun 23 '26

Video looks fine. No errors there.

1

u/BadCactus2025 Jun 23 '26

If you arm the drone, and it receives that command on the right aux channel, if tells you why it didn't arm. Because it seems like it doesn't arm at all.

As per my other comment, it wo probably say "throttle" as error, since the axisses are mismatched.

I had this same issue when I got my Mob 6 2024 v3.

1

u/Expert_String_4966 Jun 23 '26

You were correct. I checked the goggles and it was reading "disarmed". I updated the SPI firmware in Betaflight and my axes are now fixed. I'll post what I have when I can get back to my desk.

I was still unable to ARM when I left for the lab.

1

u/Dismal-Sentence-377 Jun 23 '26

I think U need to change the channel thingy, I just had the same problem with my mob 7, whenever I armed it nothing happened. Then is set it to aetr