Raspberry Pi CNC hat circuit board

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22 Aug 2024 21:00 #308432 by atomicmill
Hello,
I wanted to replace the external Linuxcnc control PC on my mill with a dedicated control inside the electrical cabinet, but I needed something compact that is easy to wire inside an enclosure, which is why I thought of using the RPi5 and a custom designed GPIO breakout board.

 

The board is intended to be used as a 5 axis step/dir platform with 6 extra outputs and 10 inputs. All the Raspberry pins are digitally isolated and the outputs are buffered with 5V @ ~20 mA drive capability. The board has dedicated power connectors for the 5V RPi supply and 24V isolated bus. A 5V step down converter connected to the 24V bus provides the necessary voltage to run the digital isolators and buffer gates.

Here's the new repository with the Kicad design files: github.com/atomicmill/raspberry-pi-5-Linuxcnc-hat

So far I tested the board with LCNC 2.9 and the Probe Basic and PlasmaC UIs. I hope this board is of use to anyone looking for a low cost all in one LinuxCNC control.
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The following user(s) said Thank You: Aciera, royka, onceloved

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03 Sep 2024 12:34 #309279 by andypugh
What sort of step rates are you getting through the GPIO? (And which driver are you using?)

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