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Upcoming Alexmos Firmware V2.42B5 with Autotune – What’s new

 Auto PID Tuning – Autotune

Alexmos autotune


Adaptive PID gains – Selectively for each axis

This settings group lets to adaptively decrease PID gains, when the system becomes unstable due to
high PID gains. For example, system may be tuned very well in certain position, but it may become
completely unstable in different position. Self-excitation may cause strong vibration, that may negatively
affect gimbal construction and may be even dangerous for the camera. Also, when vibration
accidentally comes, it may brake whole footage. Possible workaround is to use adaptive PID control.

Alexmos Firmware V2.42B5

Alexmos Adaptive PID Gains



PWM servo output

Alexmos Firmware V2.42B5 2

Alexmos Firmware V2.42B5 3


Digital Filters

Notch Filters

These filters can reject narrow bandwidth. They can help in case when the system has a pronounced
mechanical resonance.

Alexmos Adaptive PID Gains


Low-pass filter

Applying this filter can be needed for large gimbals (heavy cameras with high moment of inertia) or for gimbals
with reduction gear. The working frequency range for them are lower than of the lightweight gimbals. But factor
D of PID-regulator increases feedback the more, the higher frequency.

Alexmos Low Pass Filter



Filters 2


Alexmos 32 Bit V2.42B5 Autotune with GH4 – How it works

[wp_lightbox_prettyPhoto_video link=”” width=”800″ height=”600″ description=”Alexmos 32 Bit V2.42B5 Autotune with GH4 ” source=”” title=”Alexmos 32 Bit V2.42B5 Autotune with GH4 “]

RokSteady G4 Brushless Gimbal using Alexmos 2.42B5 Autotune

RokSteady G4 Brushless Gimbal

  • A Gimbal Designed around the Panasonic GH4
  • Total weight (including camera & lens) with Batteries 5.9lbs (2.6kg)

[wp_lightbox_prettyPhoto_video link=”″ width=”800″ height=”600″ description=”RokSteady G4 Brushless Gimbal using Alexmos 2.42B5 Autotune” source=” “]


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2 Responses to Upcoming Alexmos Firmware V2.42B5 with Autotune – What’s new

  1. Dominic August 7, 2014 at 7:53 pm #

    Very interesting,
    What are the PWM are for ?

    Would it be for auxiliary servo like zoom pull and focus pull ?, well if it’s for that, i’m an happy man

    • Aerial August 7, 2014 at 8:09 pm #

      It can be used to convert SBUS/PPM signals to PWM for ease of connectivity on 3.0 boards. An example would be using a 3CH SBUS receiver >> single wire to alexmos >> 4 x PWM out >> Shutter/Zoom/Aperture/ETC. So you would be able to get 8 channels working with a 3 CH receiver; Pitch+Pan+Roll+Function

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