Remora - Rpi Software Stepping Using External Microcontroller via SPI

Ok, so below are some good pictures of the SKRv1.3 SPI cabling.

I've also tested powering the controller board independently via the USB port. With no issues with SPI connection. However, I would not recommend this and to ensure that you have a common ground between the RPi and the controller board.

Hi tomp, 

Just noticed in your photo that you have +5v power coming from the controller board and have the power plugged into the RPi to. Not sure if this would be causing your issue but not a good idea to tie the grounds and the positive rails of the two together.

Brown wire below:

 

As Scott pointed out, you really do not want to connect the 5V "rail" of 2 devices which each product 5V outputs. But if you are trying to use logic signal between 2 boards, those signals are referenced from Ground so normally you just connect the grounds of the 2 devices together and now the signal voltages above ground can be sensed by the other device(s).

And the reason for not connecting the 2 5V outputs is that one might generate 4.95V and the other might be generating 5.15V and now you have a difference in potential, probably reverse power flow, excess power drain/heat and maybe other errors with 2 different potentials.

Hello,
Sorry I missed these messages,
I had put the project away until i get another board.

I got the 'skr v1.3' from there's a tiny thai/englisg flag icon to choose language
but its no longer listed, so the info is useless,

These boards are rare-er than parallel ports.

I will re re re re do the spi wiring with ribbin cable
and skip the serial
( thats where i had 5v and gnd from rpi , well,  maybe try with gnd but not 5v)

And will also wait for a new MKS v1.3
( the SKR 1.4 turbo was another lie that eventually got marked out of stock, and refunded )

thanks again I will monitor more closely while waiting

1 Question: do you have a sampe ngc file of a 3d Print?
 I wonder if I need custom M1xx codes.

tomp

Hi tomp,

I had to order another board a couple of days ago as I stupidly put a driver in backwards.. The chip shortage may be making these harder to get. I placed the order, but no order confirmation. The CN sellers are normally pretty responsive.

I have a set of custom M-code available for 3d printing. They are on my GitHub repository.

github.com/scottalford75/LinuxCNC-3D-Printing

I can share a simple 3d print ngc file if you like.

BR
Scott