Creating a custom GCODE command - Extending Marlin Firmware

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Today's video is once again sponsored by 3D Printing Canada. They are Canada's best source for all your 3D printing needs, check them out, show them some love here: https://3dprintingcanada.com/, and Their channel @3D Printing Canada

I often want my 3D printer to do things it was never designed to do. In order to make this happen, I have on more than one occasion, had to create my own GCODE command. This time I want to improve on my ability to take 3D printing timelapses, without OctoPrint, and remove the switch. So to do this, we are gong to create a custom GCODE command (M6453) to trigger a free pin on the control board. This will be used to go through an optocoupler and trigger a interrupt on and arduino, which in turn will trigger the shutter on multiple cameras.

So lets just dive in and see what it takes to create a custom GCODE command to extend the capabilities of Marlin 2.0.x

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