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How to arm SP Racing F3 clone with HK-T6A v2
#1
Hi, I have built a 250 quad with SP Racing F3 deluxe clone, LittleBEe 20A ESC and BR2205 motors. I have the Hobbyking HK-T6A v2 Rx/Tx combination (from a foamie that did more dives than flying time..Sad. My question is how exactly do I arm the FC. I have been able to do it twice by trying the throttle down and righ/left but this is not reproducible. In addition to that I can't disarm the board at all. One motor seems to always idle when armed while the other are stopped until the throttle is moved. Are there any settings in Betaflight that would help changing this behaviour to something more reproducible?

Thanks for reading my novel..Sad

Any help is appreciated.

Cheers

KiwiLoris
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#2
You can set up an arm switch in Betaflight under the modes tab. Then just set it to one of your auxilary channels on your transmitter. I generally like to set it to one of the switchs I can easy turn off in the instance of a crash.
[-] The following 1 user Likes Bollucks760's post:
  • KiwiLoris
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#3
(24-Mar-2017, 01:20 AM)Bollucks760 Wrote: You can set up an arm switch in Betaflight under the modes tab. Then just set it to one of your auxilary channels on your transmitter. I generally like to set it to one of the switchs I can easy turn off in the instance of a crash.

Thanks for the info..somehow my connections that work for the Tx are all four AUX channels...a bit weird..any idea how I can change that? I have tried all available spare connections but none of them reacts to any of the switches..
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#4
If you are having trouble arming with the stick commands, my first suspicion would be that you have not set the range of your sticks properly in the radio.

When you look at the channels in the Receiver tab, they should start at 1000 and go all the way to 2000. For roll, pitch and yaw, the channels should be at 1500 when the sticks are centred. If you don't see these ranges and centre points, you need to use the travel adjustment and subtrim on your radio to make it so.
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#5
(24-Mar-2017, 08:44 AM)unseen Wrote: If you are having trouble arming with the stick commands, my first suspicion would be that you have not set the range of your sticks properly in the radio.

When you look at the channels in the Receiver tab, they should start at 1000 and go all the way to 2000. For roll, pitch and yaw, the channels should be at 1500 when the sticks are centred. If you don't see these ranges and centre points, you need to use the travel adjustment and subtrim on your radio to make it so.

Thanks for the tip. Do you maybe know if this can also be adjusted in the T6 configuration or digital radio software. I can see most channels around the 1500 range when the sticks are in the Centre position. Obviously not for throttle because I tend to keep that at the lowest position but the complete travel is not quite the whole range...starts for most of them around 1180 and finishes around 1800..is that normal behavior? Thanks
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#6
(24-Mar-2017, 09:48 PM)KiwiLoris Wrote: ...starts for most of them around 1180 and finishes around 1800..is that normal behavior?

Yeah, that would explain not being able to arm.  I can't speak to the T6, but that may not be all that unusual for a TX.  Figure out how to tweak the travel adjust in your TX for as much range as you can for both directions of stick movements. Ideally you'll be able to get the 1000 and 2000 endpoints.  

On some TX like the Spektrum DX6i, maximizing the travel adjust won't be enough.  I ended up using the rxrange command in cleanflight (but betaflight has it too) to define the endpoints the TX can provide, as noted in the betaflight receiver screen.  There are four rxrange commands.  rxrange 0 is for roll, rxrange 1 is for pitch, rxrange 2 is for yaw, and rxrange 3 is for throttle.  The overall format is rxrange # <min> <max>.  Once those are set, the receiver screen should show close to the 1000 and 2000 at stick extremes. 

Also, remember that you don't want any dual rate settings in the TX as a way to "tone down" the quad.  Doing that messes up the values sent by the tx at stick extremes.  The TX is left for full range of travel and you adjust rates in betaflight if necessary.
Kevin B.
Quads:
Custom 110mm FPV, NanoQX w/DX6i
Other: 3D printing (printer buildThingiverse), electronics, AVR microcontrollers
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#7
Thanks helibus for the good info..have just tried to arm and lift off for the first time....typical beginner mistake...didn't tighten the motor screws properly so the props were flying by themselves and the quad did tumble forwards...nothing broken no damage but one screw lost...not overly bad for a first try..I understand that the quad was probably trying to compensate and that's what got it tumbling...well hopefully I'm right..I did the calibrations in betaflight before..still wondering about one motor always spinning when I arm but in BF they are all the same...
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#8
It's really important to do this in the right order.

First, make your stick travel correct. I can't tell you how to do that as I don't have your radio.
Then, you should calibrate the ESCs. If you change the throttle range after calibration, the calibration will be incorrect and will lead to the motors not spinning up when you arm.
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#9
(26-Mar-2017, 11:25 AM)unseen Wrote: It's really important to do this in the right order.

First, make your stick travel correct. I can't tell you how to do that as I don't have your radio.
Then, you should calibrate the ESCs. If you change the throttle range after calibration, the calibration will be incorrect and will lead to the motors not spinning up when you arm.

thanks unseen. I had a feeling i was missing something and not 100% happy with the response from the stick input. Now I have a way forward that I can try.
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#10
Just to let all you helpful guys know that the quad is now flying - now my part of learning starts..a few crashes already but as I understand it this is part of the hobby anyway. Thanks for all your help - next step FPV when "the boss" releases finances..Wink
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#11
(27-Apr-2017, 01:45 AM)KiwiLoris Wrote: Just to let all you helpful guys know that the quad is now flying - now my part of learning starts..a few crashes already but as I understand it this is part of the hobby anyway. Thanks for all your help - next step FPV when "the boss" releases finances..Wink

That's good to hear!

What did you need to do to get it flying in the end? It will help others who come across this thread if you follow up with what the problem was and what you did to solve it.

Happy flying (and crashing)! Smile
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#12
(25-Mar-2017, 07:02 AM)KiwiLoris Wrote: Thanks helibus for the good info..have just tried to arm and lift off for the first time....typical beginner mistake...didn't tighten the motor screws properly so the props were flying by themselves and the quad did tumble forwards...nothing broken  no damage but one screw lost...not overly bad for a first try..I understand that the quad was probably trying to compensate and that's what got it tumbling...well hopefully I'm right..I did the calibrations in betaflight before..still wondering about one motor always spinning when I arm  but in BF they are all the same...

The one motor always spinning sounds like a short. Sometimes a longer screw shorts inside the motor to the coils. or a cold solder joint or loose connection.  I have similar stuff, SPR F3 acro, FlySky FSI6 b 10ch  tx/rx - a cheap decent starter, and 2205 2600kv motors, I have the 30A bl heli's 'cause I use a 4S lipo. Check banggood for cheap self-made fpv stuff whenever the "boss" releases the funds, or just make the request at the same exact time she gets some new shoes or some other needless fashion accessory.
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#13
(27-Apr-2017, 08:32 AM)unseen Wrote: That's good to hear!

What did you need to do to get it flying in the end? It will help others who come across this thread if you follow up with what the problem was and what you did to solve it.

Happy flying (and crashing)! Smile

Hi,

for me personally what worked was to leave the motors off after arming. I understand there is heaps of controversy about this, hence why I said for me personally. This is by no means a recommendation merely another option to explorer if someone feels the they have reached the end of their tether. I might even change these settings once I get more confident  and try Acro mode, but for now I am happy to start like this consistently.

Happy Flying everyone

P.S. manager has approved FPV and camera and vTx are already in the house, just waiting for goggles that have been ordered..slowly but surely getting there Smile
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