ForceFeedback

[archiebaxter]

I have been trying for some time to get ForceFeedback on my linear arm_motor in this robotic arm example. I only get NaN in return, does anyone know why?
Two_Finger_Gripper (2).zip

[archiebaxter]

It's the world that is called validation with controller validation too.
I am simply trying to get a force feedback result on the linear motor to enable me to validate this model against analytic calculations for my university project. My deadline is tomorrow and I am completely lost so please may someone help.

[archiebaxter]

Two_Finger_Gripper.zip

[archiebaxter]

This is my current file

[ad-daniel]

As stated by the error, enableForceFeedback() requires 1 parameter (the sampling period), you need to give it one: enableForceFeedback(TIME_STEP)

[archiebaxter]

gives me this error:
arm_motor.enableForceFeedback(16)
TypeError: Motor.enableForceFeedback() takes 1 positional argument but 2 were given
WARNING: 'validation' controller exited with status: 1.

[ad-daniel]

Seems to be broken in R2023a, but resolved already in the nightly build. Install the latest nightly of R2023a (called webots-R2023a-rev1) from here:

Two_Finger_Gripper_V2.zip

[archiebaxter]

Okay, ill try that. Do i simply download the webots-R2023a-rev1 file and extract all or do i have to import it into webots

[archiebaxter]

I have downloaded the nightly rebuild and have extracted the zip file but it doesn't seem to have made a difference to my error that appears with positional arguments. How do you install the file properly into my webots app on my computer

[archiebaxter]

Don't worry, solved it now thank you!!!!!

[archiebaxter]

I am trying to get force feedback data on a coupled linear motor which is used to grip objects as they are lifted off the ground by a robotic arm. However, my issue is that my value for the force used by the gripper mechanism does not change regardless of the weight of the object it is picking up. Does anyone know why this is ? For example, in the version i have attached, the value for the gripper motor force is the same whether the red box is 10, 20, 50 or 100kg. Why is this ??
Two_Finger_Gripper.zip

[archiebaxter]

@ad-daniel ?

[ShuffleWire]

I'm working on force feedback as well and stumble on your issue, so I might brainstorm with you if you wich

however in the world you send, the box is never picked up by the arm, is that normal ?