[mturcotte]

Hi all,

Since last days, I'm facing a problem for which I can't find any answer. I tried many things from what I found on the Internet without any success.

Here is my problem...

I just bought the SF250 drone from SunFounder :  https://www.sunfounder.com/drone/multirotors/sf-qav250plus.html . I think it's almost the same as the QAV250 one is, but I'm not sure.

When I try to configure it using LibrePilot the Yaw and the Throttle are always moving together at the same time. So, when I move the throttle, the Yaw is moving. When I move the Yaw, the throttle is also moving. Depending if the Inversion checkbox is true or not, the way it moves is the same or not the same.

Up to now, I tried many things like changing the pre-configuration option (quadcopter models), connecting wires differently to the channels, changing some options like the hardware one and trying to configure it manually.

For your information, the ESC are EMAX Simon 12A, the receiver is a RadioLink R8EH, the transmitter is a RadioLink T8FB and the flight board is CC3D.

To help you helping me, I attached some pictures.

Thanks a lot!

Mathieu T.

[mturcotte]

Here is another picture...

[f5soh]

Hi, welcome.

Please post your config file
File > Export UAV settings

I see your receiver support Sbus, why you still use old (all wire) PWM solution ?

[mturcotte]

Ok. I just attached what you asked for. Thank you!

[mturcotte]

Concerning the wiring, is there another way to plug it? I used the cable that was sent with my quadcopter.

[f5soh]

Except the Throttle neutral not set correctly all looks ok.
You can redo a Manual calibration.

Best option is use the SBus.
Connect the receiver to the mainPort using Gnd, +5V and Sbus signal.
Be sure how to configure your receiver for SBus output.

https://librepilot.atlassian.net/wiki/display/LPDOC/CC+Hardware+Configuration#CCHardwareConfiguration-MainPortandFlexiPortserialcablepinout

This option uses less wires and allow PWMSync / OneShot output.

[mturcotte]

From what you see in my pictures, what's the name of the cable I need to buy for doing this? 

[mturcotte]

Because when I look for SBus Cable on Amazon, it doesn't find a lot of results.

[f5soh]

Every CC3D board should comes with a JST 1mm - 4 pins connector / cable to be connected into the MainPort or FlexiPort

Another option is use PPM input, using the same cable you have and pin8

[mturcotte]

Ok, so if I want to try this PPM_PIN8 wiring diagram, do I need to plug these 3 cables (black, red and blue) side by side or verticaly? Thanks again! 

[f5soh]

Take a look at your receiver doc how to connect / configure for PPM output.
http://www.skyhobbies.com.sg/Skyhobbies-radiolink-t8fb-manual-v2.pdf

[TheOtherCliff]

Maybe your RC radio is sending it that way?

Look at the GCS Configuration -> Input page with flight battery plugged in and move one stick while watching to see if the other channel moves.

Also, it is hard to move one without moving the other.    Are you sure that is not happening?

[mturcotte]

It's the problem I try to solve. In the Configuration - Input page (plugged), when I move one of both, the other is also moving. So, you think it's something normal? 

[TheOtherCliff]

It is not normal, not correct, but this seems to say that the problem is in the RC (not in the flight controller board).

Throttle does not have a spring so sometimes it is difficult to keep throttle fixed while moving yaw.  Is it possible that is your problem?  If not, ...  Most modern transmitters have storage for multiple models.  It might be good to select "new model" = airplane (not helicopter).  You should run Input -> Manual Calibration or Transmitter Wizard after that because your neutrals may have changed.