Raspberry Pi to SKR/SKR Pro Adapter for ReprapFirmware
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The adapter sold by TeamGloomy on Tindie for this purpose is sold out. This is my equivalent replacement.
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I'm looking at putting ReprapFirmware on my Hypercube 300. The necessary adapter to connect its Raspberry Pi Zero 2 W to its SKR Pro 1.2 is out-of-stock on Tindie. This is a smaller adapter that does the same thing, only it plugs into the EXP2 header on the printer motherboard and a 6-wire cable connects the other end to pins 19-24 on the Raspberry Pi GPIO header. (I already have a 4-wire UART connection between the two that also supplies power; instead of putting in the full 40-pin GPIO header, it only has enough pins populated for the connections I'm using.)
It was a quick layout to throw together in KiCad; I probably spent more time playing around with panelization options than on the main layout. :) I should have 100 (20x5) bare boards arriving from JLCPCB, and the parts to go on it are dirt-cheap…should be well under $5 from DigiKey, and probably under $1 each in quantity from LCSC.
No photos yet as the board order only went out this morning, though there is a raytraced render produced by KiCad.