# Min/Max PWM on outputs only available controls?

**URL:** <https://discuss.px4.io/t/min-max-pwm-on-outputs-only-available-controls/3522>\
**Category:** Uncategorized\
**Created:** [June 8, 2017, 12:32pm UTC](https://discuss.px4.io/t/min-max-pwm-on-outputs-only-available-controls/3522 "2017-06-08T12:32:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![smgoza](https://discuss.px4.io/user_avatar/discuss.px4.io/smgoza/32/6335_2.png) [@smgoza](https://discuss.px4.io/u/smgoza)\
**Post date:** [June 8, 2017, 12:32pm UTC](https://discuss.px4.io/t/min-max-pwm-on-outputs-only-available-controls/3522/1 "2017-06-08T12:32:45Z")

</div>

I have written a custom mixer for an airframe and got it to work. It needs some fine tuning of the servos to get optimal geometry. Specifically I need to set the min/max and neutral positions for PWM outputs. I can do this on the RC inputs. There are parameters to do so, but all I see for the PWM outputs is min/max that applies to all 8 channels. Is there a way to set these individually or are you expected to scale the mixer outputs to include the extremes and neutral offset in the calculations? I can do that easily, but I just want to make sure that is the desired method.