Channel 5 pwm values not responding properly

ArduCopter
1

Hello,

I am using arducopter 4.3.7 and I have just replaced my Turning 9XR radio with BetaFPV LiteRadio 3 Pro. The Lite Radio 3 Pro has two 2pos switches and two 3pos switches.

I have managed to setup and combine two switches(one is 3 pos and one is 2 pos) in order to have them to control my channel 5 and therefore to use them for selecting between 6 different flight modes.
I assume that my channel 5 is correctly set on my Lite Radio 3 Pro because when I am in the outputs page on the radio’s screen, I can see that when I am switching between the 6 different positions, for the channel 5 I am getting these pwm values (1162, 1291, 1420, 1558, 1691, and 1822).
But while switching between these 6 different positions on my Lite Radio 3 Pro, in the Radio Calibration page of mission planner for channel 5 I don’t see these 6 different PWM values but only two ( 995 and 1998). Which means that I can only choose between 2 different flight modes).

What is wrong here? Could someone help me on this?

My previous Turning 9XR I didn’t have this problem.

Thanks a lot

2

If you’re using the ExpressLRS protocol, channel 5 is always a 2-position channel, no matter what. It’s a “feature” of the protocol and should always be used for arming.

3

Dear @Yuri_Rage ,

Yes I am using the ExpressLRS protocol…makes sense I guess. I didn’t know about this feature…

In order to fix this, should I go to the Mixes page of the Lite Radio 3 Pro and assign these two sticks(the 3pos and the 2 pos) to control let’s say channel 6 ? And leave channel 5 empty?
And then use the FLTMODE_CH parameter to 6? I saw that in arducopter the default channel for flight mode selection is channel 5…

I say to leave channel 5 empty because in arducopter I am arming using the throttle and yaw stick by keeping it at down right position diagonally for a couple of seconds…I guess this channel 5 arming switch is for betaflight?

Thank you

4

That arming switch is a “feature” of ExpressLRS protocol, that arming switch changes both transmitter’s and receiver’s state between “ground” and “air” modes. AFAIK it is recommended to use arming switch with ELRS.

5

You can still use rudder arming and just leave Ch5 high. It’s not the recommended way, but it works.

I use an EdgeTX function to set Ch5 high and low with the rudder arming commands on my Copter mixes. Not sure how to do that on the BF radio.

6

I finally combined the two switches to control channel 6…I did this through the Mixes page of Lite Radio 3 Pro…And then in arducopter I specified FLTMODE_CH=6…
And it works…

Channel 5 was cancelled…

Thank you

7

You still want to hold Ch5 high when armed for proper ELRS functionality.

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