Integrating a BCL-AMP capacitive sensor to LinuxCNC

PCW wrote:

A cleaner, linear response signal could be the ticket, as I have fiddled with the PID parameters quite a bit as well as my Z axis velocities and accelerations and it is still not really where I'd like it to be.

Have you considered linearizing the output (with lincurve) before feeding the linearized distance to the
PID loop?

This has already been done.

Have you seen linear graphs?

This has its drawbacks though.

Non-linear characteristics are very good because they have higher resolution/accuracy for useful focus ranges and lower for a larger distance which is not very important but you are right, it is more difficult to handle for a standard PID.

The sensor can be switched between linear and non-linear characteristics as needed and desired.

PCW wrote:

A cleaner, linear response signal could be the ticket, as I have fiddled with the PID parameters quite a bit as well as my Z axis velocities and accelerations and it is still not really where I'd like it to be.

Have you considered linearizing the output (with lincurve) before feeding the linearized distance to the
PID loop?
 

 

PCW: That is not something that I had thought to try. I'll have to give that some thought and see how it performs. Thanks for the tip


prokopcio, I'd recommend starting a new thread in this subforum so we can discuss your design. Looks promising!