Rc1_trim value changes after every operation in skid_steering mode

@gray03 wrote:

Hi,
I want to drive my rover on a straight line in manual mode with skid_steering. I am using an apm 2.6, turnigy 9xr and 2 brushed dc motors.
In mission planner:
SKID_STEER_IN=1
SKID_STEER_OUT=1
My 1st motor connected at 1st pin of apm and 2nd motor connected at 3rd pin of apm. I am also using dc motor driver like this

For straight driving i have to get same pwm from apm's 1st and 3rd pins. But after each operation I noticed that RC1_TRIM value has changed.

What am I doing wrong? Is there any idea?

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