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A little weekend side-project, trying out gravity comp with PWM controls on an so-101 It holds but feels very stiff, the giant gear ratios probably impact backdriveability. Will see if any AI/SW tricks can mitigate, would prefer keeping standard servos Pepijn 🦾
16,106 views • 2 months ago •via X (Twitter)
11 Comments

@pepijn2233 stiction compensation can help a lot if you haven’t tried it already

@pepijn2233 that limb is looking dangerously close to gaining free will

@pepijn2233 Let's compare notes I did the same for the ElRobot arm.

@pepijn2233 > "these motors only have position control" this is not right for feetechs, they offer direct pwm control as well which allows us to approximate voltage & current control. this is the correct way to implement gravity comp rather than using position control

@pepijn2233 I like your approach with PWM I am going to test it too.

@pepijn2233 share code I think I can help you with this

@pepijn2233 I will eventually but it's not ready yet, what part might you be able to help out with?

@pepijn2233 should make teleop easier right, esp bimanual ?

@pepijn2233 it's step 1/n on that journey and I'm not sure if all steps are feasible on these motors

@pepijn2233 The standard servos may still be workable if the gravity term stays deliberately conservative. Have you measured backdrive torque across the joint range yet? That would help separate gearbox friction from controller stiffness before adding more software compensation.

@pepijn2233 gravity comp on a so101 is fiddly. connect sometime
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