I used Ardusub firmware v3.4 and connect light to rc9. when i changed the pwm value through joystick,the light will be brighter or dimmer normally.
But when i operated the propellers, the light will be off. once i did not operate the propeller, the light will be on normally.
I also connected the light to Arduino and set pwm value to 1700, when i operate the propeller, there is no effect.
I think when i operate the propeller , the pwm value of rc9 will be affected.