Other analog Scanning Z Probes?

SanderLPFRG

@droftarts Old topic, but I have another general analogue output probe (loadcell with op-amp structure and amplification with custom canBUS board)

I can configure and measure using the scanning Z probe (11) definition, but a load cell is unsuitable for a "scanning" measurement. It is however not possible to define it as a P1 probe on a canbus toolboard.

May I ask why this decision was made, and where in the firmware I could look to make it possible?

droftarts

@SanderLPFRG The wiki says here https://docs.duet3d.com/User_manual/RepRapFirmware/CAN_limitations#semi-permanent-limitations that it's technically possible to have other probe types beyond 8, 9 and 11. I think the concern is about latency, but @dc42 would know better, and be able to give you the advice on firmware.

Ian

SanderLPFRG

@droftarts I see.

I get why it would be a possible issue with latency but for our use we need to be able to define it as such.
We found in the source code where it defines the probe and throws an error, but we would like some advice on if just removing the error gives us a solution

dc42

@SanderLPFRG I think there are two pieces of work needed to support other types of scanning Z probe: (1) allowing general analog-output Z probes to be used in scanning mode; and (2) supporting analog Z probes over CAN.

SanderLPFRG

@dc42 said in Other analog Scanning Z Probes?:

Yeahh the biggest issue is that I do not want the loadcell configured as a scanning-type probe, but as a normal analog probe, which is prohibited for CANboards. so I am leaning to version 2.

I am trying to build new firmware for the 6HC (to remove the error it raises when remote Z probe type is not 8, 9 or 11) but I am getting building errors regarding the CoreN2G...

"../src/TinyUsbInterface.cpp:28:10: fatal error: tusb.h: No such file or directory"

SanderLPFRG

@dc42 please note that the tusb.h file is actually present

dc42

@SanderLPFRG looks like you are using the wrong tinyusb project. The one we use is called Libtinyusb.

SanderLPFRG

@dc42 I just tried to build with the latest master branch of the libtinyusb from here; https://github.com/Duet3D/LibTinyusb

I also tried the 3.6.0 beta2 release, which is the same as the rrf sourcecode I am trying to build

still did not work, same error

SanderLPFRG

@SanderLPFRG Got it working, version mismatch.

SanderLPFRG

@dc42 is it okay if I try to enable this functionality in a branch via github? If I manage I will make a pull request for you to integrate it into the main branches.

Lot to learn for myself, but I like a challenge.

dc42

@SanderLPFRG the firmware is open source so you can do what you like. There is already some support for analog probes in the expansion board firmware because the scanning inductive Z probe is in effect an analog probe.