Hi everybody
I am new in the area of quadcopters.
I start building my own quad and i have a problem that can't solve.

My receiver is a  FrSky V8FR-II 2.4Ghz 8CH Receiver and my FC is a X-Racer F303 V3.1.
The V8FR-II works only with PWM (one cable per channel) and my FC has only 6 channels input.
So when i put only 6 cables to the Rx, as the number of the input channels of FC, i have problem with the movement of the sticks on the Betaflight/Cleanflight configuration.
My questions are:
1)To work the Rx, has to put 1 cable in every channel? (so 8 servo cables?)
2)If yes, then how i am going to wire them in my 6 channels input FC?
3)Can this specific Rx and FC work together?

You need to connect one cable per channel, but if your flight controller only has six inputs then you can only connect the first six channels. However, six channels should be enough unless you have extra hardware on the quad to control. If (for example) you had a gimbal that you wanted to control with channels 7 & 8, you could connect those channels directly to the gimbal.

If the sticks don't do what you expect in the configurator then it's most likely that your channel ordering is not set correctly. FrSky receivers use AETR1234 channel ordering, so check that you have that order in the receiver tab on the configurator.

Can you post a couple pics of your wiring, as it sounds as if you may be confusing signal and motor inputs/outputs. The X-Racer has 8 PWM inputs on the right side and 6 ESC outputs on the left side, so I don't understand when you say yours only has 6 channel input.

(09-Sep-2017, 10:45 PM)RENOV8R Wrote: The X-Racer has 8 PWM inputs on the right side and 6 ESC outputs on the left side

Sorry, but that's incorrect. The X-Racer has 6 PWM inputs and 8 PWM outputs.

Seems to be different diagrams for the X-Racer, I just checked again and this one shows 8 ESC outs and 8 PMW ins

https://www.fpvmodel.com/u/tmp/goods_des...5-5348.png

(09-Sep-2017, 11:45 PM)RENOV8R Wrote: Seems to be different diagrams for the X-Racer, I just checked again and this one shows 8 ESC outs and 8 PMW ins

https://www.fpvmodel.com/u/tmp/goods_des...5-5348.png

That's for the older 2.1 version. The OP said that he has the V3.1 X-Racer and the image I posted is for that revision of the flight controller.

I connect the first 6 channels with Rx and have the same problem with the stick movement.
Also i checked if there was a problem with the binding of my Turnigy 9XR Pro with my Rx, but all the stuff was OK.
I don't know if i have to do something in the Turnigy 9XR Pro, to work properly in PWM. (the only thing that i have done in the turnigy is the calibration)

I post some photos...





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In the "Configuration" tab of BetaFlight, you need to choose "PWM RX input" from the dropdown in the Receiver section (and hit save). [Notice in the image below, mine shows PPM RX input.]

When you say that you have a "problem" with the stick movement, can you be more specific?

Do any of the channels change when you move the sticks? Do the wrong channels move?

Also, looking at your photos, you need to properly insulate where you have soldered the motor leads to the ESCs. The carbon fibre frame is conductive and if you accidentally make the exposed connections touch the frame, you will be unpleasantly surprised by the result!

Yes i chose "PWM RX input" in Betaflight.

I have no response of throttle,yaw, pitch and roll when i move the stickers in betaflight receiver tab.
The only things that changes are the AUX1 and AUX2 as i move other sticks(see the picture below) of the Turnigy 9XR Pro (the other two, AUX3 and AUX4 are not responding too)


Thanks for the advice...i am going to insulate them.

The motors works fine.
I played with the AETR but nothing happens.

Silly question, but is the green LED on the receiver lit when you are trying this?

Yes it is.

If you go to the CLI and type 'version', what does it show?

for Betaflight

# version

# Betaflight / X_RACERSPI 3.1.7 Apr  3 2017 / 22:34:08 (e1c4b5c)


is the latest stable firmware for X_RACERSPI