K40 eBay Chinese CO2 Laser Cutter – Running with the Arduino UNO and GRBL Part 3!

Please visit www.DIY3DTech.com for more information on this and many other projects! As in this episode we will be connecting the newly flashed Arduino and CNC shield as well as designing a logic inverter to fire the laser around a single NPN transistor as GRBL via the CNC shield outputs a high signal for spindle start (i.e. to turn on the laser) while K40 laser expects a low single to fire the laser so we need to hardware “invert” the signal. We will discuss the general build items to this point and what you should expect if you plan to undertake this modification.

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