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Just Add Board - https://shop.justaddsharks.co.uk/collections/featured/products/open-source-break-in-board
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Leetro PAD03-E & Cable - Ordered from Just Add Sharks on request
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Raspberry Pi 3
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RS232 header for Raspberry Pi - https://www.tindie.com/products/DTronixs/raspberry-piio-minipiio-rs232-add-on-board/
N.B. you'll need to get a gender changer to connect the display to the serial module as both are DB9 male.
I'd suggest the following part from CPC:
I didn't know this in advance so ended up making a gender changer up using parts from the junk box. That was annoying but also kinda useful as it let me build a DB9 to DB9 adapter that I could insert power into for developing on a standard serial port rather than just on the Pi RS232 board with the power hack.
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Arduino Uno
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GRBL v3 CNC shield
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Self adhesive PCB mounts - http://cpc.farnell.com/webapp/wcs/stores/servlet/ProductDisplay?partNumber=PC01959