My first 2 DOF

I am looking forward to seeing your rig complete and a video of it in action

Looks like you are using SMC3, which should be mode 2.

So the SimTools Interface Settings should be:

Interface Type - Serial

ComPort = the Arduino ComPort, you can find it in Windows Device Manager.

BitsPerSec - 500000

Data Bits - 8

Parity - None

Stop Bit -1

Output Bit Range - 10

Output Type - Binary

Interface Output - [A<Axis1a>][B<Axis2a>]

Once that is done the Default Axis Assignment should be setup. For now don't use any Filter settings, as that will only complicate things.

To check the movement of each axis (sway, surge, roll pitch and heave) initially set each to 20%, you will refine this later and likely have more set for sway and less for heave, but you first want to check movement directions. Ultimately the allocated total should be around 100%: https://www.xsimulator.net/community/faq/axis-assignment-percentage-totals.120/

The DIR box being checked or unchecked orange or not determines which way each axis moves, which can be tested in Output Testing, this is what SimTools expects: https://www.xsimulator.net/community/faq/which-way-to-set-simtool-axis-movements.230/

After that the Default Axis Assignment can be cloned and then tweaked for different games, traditionally start with LFS, which must first be run before it is patched for motion: https://www.xsimulator.net/communit...run-in-first-person-mode-before-patching.365/

Next the settings for each game can be tweaked, see the FAQ tuning tips: https://www.xsimulator.net/community/faq/steps-to-create-a-motion-profile.228/

If connected to the rig then likely spring or gas struts to take some strain off motors, but they can also dampen fine motor cues.

If attached to a harness the likely parasitic or telemetry driven race harness.