Elevon Throttle mapping

Pixhawk 2.4.8
ArduPlane V3.8.4
Taranis Qx7
FrSKyx4R (Sbus communication)

Channel Mapping: (Taranis)
1 - Aileron (1000 min, 1500 trim, 2000 max)
2 - Elevon (1000 min, 1500 trim, 2000 max)
3 - Throttle (1000 min, 1000 trim, 2000 max)

I have attempted to follow the setup guide for Elevon Planes; however, I encounter a repeated issue with the Throttle.

I have attempted to use Servo 3 in function 70 (Throttle) to map my throttle channel to the throttle output of the Pixhawk, but I repeatedly get no response from my motor. I have calibrated my radio and can see it is receiving in the radio calibration page, but when I go to Servo Functions page and check “Channel 3, Throttle”, it’s output PWM levels don’t move at all.

If I change the Servo3 function to 53 (RCIN3), then the throttle functions normally, and I can see it change in the Servo Functions page. I was curious if I could get some help, as I am afraid of this causing an issue during an automatic mission.

Have you armed your plane when you try to do the bench test? http://ardupilot.org/plane/docs/arming-your-plane.html


I think I may have figured out part of the problem. I was unable to arm due to bad GPS and Terrain data from my faulty GPS module cables, therefore, when I bypass required arming procedures (ARMING_REQUIRE = 0), I can use the throttle as needed.

In terms of follow up, I was planning to replace the GPS wiring, but couldn’t find any concrete details on the types of JST connectors. I am using a Ublox M8N gps module for external measures, and was planning to replace the wire and connector housing with the 4-pin and 6-pin listed below:

  1. https://www.ebay.com/itm/20-Pairs-Micro-JST-1-25-4-Pin-Male-and-Female-Connector-plug-with-Wires-Cables/252680163250?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D50526%26meid%3D0396ebbc10884177be6023b932e5585b%26pid%3D100005%26rk%3D5%26rkt%3D6%26sd%3D162792273597%26itm%3D252680163250&_trksid=p2047675.c100005.m1851

  2. https://www.aliexpress.com/store/product/20-SETS-Micro-JST-1-25-6-Pin-Male-Female-Connector-plug-with-Wires-Cables/719331_32313079937.html?spm=2114.12010612.0.0.54e558adMkwaNe

Thanks again for your help, I just want to make sure I’m grabbing the right equipment before I tell my team we’re all good to go