Duet3 --> SBC Custom Wiring Issues
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Re: Duet3 -> SBC wiring (without the ribbon cable)
So I am trying to not use the ribbon cable due to where I would like the mount the pi on the machine and I have followed the post above but I cannot make any connection to the Duet.
Can someone please give me some advice on what I am doing wrong? I have attached pictures of my wiring.
Everyone works perfectly fine with the factory ribbon cable.
My connections are based on what is listed on the required pinout wiring in the docs which is further confirmed by the picture below from the post above (only the blue circled pin).
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@misterjtc it looks to me that you have the correct pins. Here's an extract from the 6HC version 1.01a schematic showing which pins are connected on the Duet:
The 5V connections are only fed to the jumper that allows the Duet 5V to be powered by the Pi.
However, we run the SPI bus at quite a high clock rate (8MHZ by default AFAIR), so signal integrity might be a problem when not using the ribbon cable.
PS - a bad crimp in your cable is another likely reason.
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@dc42 thanks for the reply.
Thank you for confirming that. I wanted to make sure I hadn't done something wrong connection wise before I continue my troubleshooting.
After my initial issues, I did check continuity between all of the terminals of my cables and found a bad wire which I replaced but it did not fix my issue.
The relationship between clock and wiring is above my level of understanding. What is the difference between the ribbon cable and my wiring (I did use some cheap wire from a kit)?
Based on your comments I am thinking to remake the connection with some better quality wire. I saw in another post (which I cant seem to find right now), where a user had success using ethernet patch cable. I expect that this wire will be good for high quality data transfer.
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Just to close the loop on this.
It was in fact an issue with my custom-made cable. I made a new cable taking a lot of care on my crimps and sealed both ends to hold everything tight and its working.
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@misterjtc thanks for confirming that!
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