How about a small tablet running windows or linux and your favorite gcode sender. Than you have a (touch) display and can put in an SD card. You can control the tablet from another PC running TeamViewer or other remote control software.
Thinking out again, might be too much time issue.
I have currently 2 GRBL machines and it seems like these little controls are multiplying, sooner or later. I¨m currently 3D printing out some midsize project and keep wondering is there anything arduino related that can send gcode to GRBL from SD card. 3D printers generally do this, but with GRBL it would be two different arduinos. Did some gooooogle and results get me nowhere, well there is something with rasberry, but it won´t fit the bill. I`m thinking purpose build platform with those big 3D printer friendly LCD´s and build in card readers, few extra buttons for homing and jogging. This would be really nice interface, but anyone done it yet, because this is so out of my capabilities.
Found something related:
grbl based cnc without pc
https://www.shapeoko.com/wiki/index.php/Headless
This headless looks somehow good, but lacks important features.
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How about a small tablet running windows or linux and your favorite gcode sender. Than you have a (touch) display and can put in an SD card. You can control the tablet from another PC running TeamViewer or other remote control software.
It seems like some sort tablet is the way to go. My thinking about another arduino board is for bulletproof design, doing only one thing, with tablet etc. there are every time some random variables why it stop working. Cheapest android tablet is around 70e, so maybe. Not very happy with laptop, it just collects all the dust.
Keep in mind that there aren't many gcode senders that run on android, i only know one!