RC Calibration

[r.vazquez453 (Ramon Vazquez)]

I was wondering if you could help me with my issue, so I have the same transmitter and receiver as you and i also purchased a PPM encoder. (https://www.amazon.com/gp/product/B019V59KCS/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1) the system seems to be working well but when I run mission planner and try to calibrate the radio it displays 16 RC channels and only calibrates RC 1-9 and RC 10-16 do not calibrate. The other issue is that i don’t think it sees those channels since it doesn’t show a green bar it has them in a grey color. Then when I try to arm the quad copter the mission planner displays a Prearm: 16 error.

Any idea of how i could solve this issue?

[gleb.gira]

Hi Ramon,

Sorry for the delayed reply.

May I ask you to send us a screenshot of this issue?

Have you tried to set RCx_TRIM parameter equal to RCx_MIN in Full Parameter List? You should do that for every uncalibrated RC channel.

[r.vazquez453 (Ramon Vazquez)]

This is what I see and what I am able to calibrate once I am running the calibration. Once I end the calibration channels 1-8 will say a number between 1000 and 2000, while channels 9-16 will have a value of 0.

I tired setting the RCxTrim parameters to 1500 since at the end of the calibration it says channels not connected auto set to 1500 but that didnt help ether.

[mlebret (Marc Lebret)]

@r.vazquez453

This is what I see and what I am able to calibrate once I am running the calibration. Once I end the calibration channels 1-8 will say a number between 1000 and 2000, while channels 9-16 will have a value of 0.

Your PPM encoder is limited to 8 channels… If you want more, you have to buy sBus receiver.

[r.vazquez453 (Ramon Vazquez)]

How can i change the settings on ardupilot mission controller so that there are only RC 1-8 instead of 1-16 since i am only using 8 channels?

[mlebret (Marc Lebret)]

@r.vazquez453

How can i change the settings on ardupilot mission controller so that there are only RC 1-8 instead of 1-16 since i am only using 8 channels?

You do not need to do that.

[r.vazquez453 (Ramon Vazquez)]

well if i leave it as is i get a pre-arm warning and if i turn them off and try arming the quad copter the props start running even at 0% throttle.

[mlebret (Marc Lebret)]

@r.vazquez453

and try arming the quad copter the props start running even at 0% throttle.

MOT_SPIN_ARM is set at 0.10 (default) so you know when it is in armed state. If you do nothing, it disarm after 5".

MOT_SPIN_MIN is at 0.15 (default), it is the minimum rotation speed when flying.