Need help connecting Pixhawk and Fly Sky FS-TH9X/FS-R8B

I know a lot of folks have similar builds, so looking for a little help on this one.

Here are the components:- DJI Flamewheel 450 kit (frame, motors and ESCs)- Pixhawk with ublox GPS- FlySky FS-THX9 with the FS-R8B receiverIt seemed pretty dummy proof to connect everything until I got to wiring the Pixhawk and the receiver. I connected the ESC leads into positions 1-4 on the Pixhawk and connected the “RC” lead from the Pixhawk to the “BAT” position on the receiver. Nothing… It just sits there and the ESCs beep at me while the Pixhawk flashes a double yellow LED indicator. I know the TX/RX are bound because I can connect an ESC lead directly in the receiver and the TX will throttle it up. I’ve tried looking up solutions for the beeping ESCs and the flashing double yellow led on the Pixhawk (“Error: System refuse to arm” – got it, tell me something I don’t know) but have been unsuccessful so far.

A user on another forum suggested 1. The correct port to is the sbus port not the RC port and 2. is there an indication that the FSR8B receiver is a Sbus/PPM receiver? Does it output PPM from the BAT position? If not you will need to get a PPM encoder board and wire each of the 8 channels to it.

Looking for any other suggestions or folks experience with a similar build and same TX/RX. Thanks!

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  • Hi Jon,

    I came to your post when I was searching for an answer for this. If you are still stuck on this here is what you should do:

    1) Get a PPM encoder like 3DR PPM Encoder.

    2) Connect all channels of your FS-R8B to the PPM encoder channels. There is only one output which is the RC.

    3) Connect PPM encoder RC output to PixHawk's input RC channel.

    4) Connect Power to BAT.

    When you use Mission Planner or APM Planner, your radio signals should now show. In addition to connecting the motors to the Pixhawk, you are all set to fly after calibration. Remember to hold the safety switch down!

    Here is my schematic of how I connected my devices, and you can find more info about this. http://nasa.z-proj.com/pixhawk-connections/

    Pixhawk Hard Connections
    If you were not sure how to connect your Pixhawk, here is a schematic of my connections.
  • 1. Yes you need a PPM encoder,  If you purchase an X8R unit you don't need a PPM encoder.

    2. PPM / SBUS goes into the Pixhawk RC IN port.

    3. The PPM encodes each channel in order so from the Receiver Channel 1 to 1, 2 to 2 or whatever order your channels are setup from your radio.  Channel 3 should be Throttle, Channel 5 has to be flight mode.

    4. DJI ESC's are calibrated at the factor to be 1000-2000 PWM.  So your transmitter should be calibrated to output 1000 as it's min and 2000 as it's max.

  • What you guys are saying for a solution is very confusing, I do not follow your terming of the ports, there must be a typo in what you wrote.

    What is the solution to connecting FS-R8B to the Pix hawk.

    1) Does it have a PPM out channel? Yes/No - which channel port

    2) PPM sum channel goes directly into the RC input port on the Pix hawk, right?

    3) How did you connect the PPM sum to the 1-5 reciever channels??? This statement does not make sense.

    You also make statements about connecting through the PPM sum on the TX, which does not exist. There may be a PPM sum on a RX but not a TX, this is very unclear.

    4) What is a terminal reset and how is it done? Please provide more details to the process.

    Thank you for clearing this up. Not being able to connect to the Pixhawk is killing me

  • Don't know if my fix will help with your setup, but what I did to get it working was two things. First, I got a PPM encoder from 3DR for the FS-R8B receiver. Once I connected it, I was finally getting the correct signals to my ESCs/motors. I was still having some minor ESC issues after the fact (DJI OPTO ESCs can't be calibrated) so I just did a terminal reset in mission planner, went through the entire pixhawk setup and calibration process again, accepted all the default configs, and it's been running like a champ since. I've been slowly adjusting the pixhawk parameters over time as I learn the quirks of my setup. Hope this helps.

  • Hey Jon,
    I was having the same problem with my fs-th9x. I just got the y6 kit with pixhawx and was able to get it to work....kind of. What I did was connect the ppm sum receiver to the rc channel in the back of the pixhawk. Then, I connected the ppm sum to the receiver using channels 1-5. This setup got 5 of the 6 motors to spin in the correct direction once I did auto esc callibration. The 6th however just beeps. There is no problem with the motor or the esc, so it's got to be the software/TX setup. Perhaps even the fact that I connected with the ppm sum even though the TX sends ppm. Also, the TX must be in ppm (menu, system, modulat) to work with this config. If You figured It out, Let Me know because I'm stuck. If not, I hope this helps.
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