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Raspberry Pi Class
Laser Cutting Class
https://github.com/grbl/grbl/wiki/Connecting-GrblThis is for arduinoveith grbl.For LPT or motor controller you have to check manufacturer's manual/datasheet etc. Motor controllers usually use step/dir control, so you'll need those pins and ground. Without gnd connection nothing will work properly.
I pasted configuration for 8A in comment below. You should find it in internet. What fuses actually mean can be found in atmel fuses calculator, other parameters are
Are quite simple to understand
Yes, but with deferent configuration: fuses and freq. Also you should connect crystal for burning to avoid possibility of bricking uC. Maybe you could make "stand alone" atmega with clock by soldering it on top of uC with capacitors. I made few... (It's topic for nwew instructable :). It should look something like this: http://www.niklasroy.com/project/116/Lumenoise
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