![]() The third arduino is connected to position encoders and an LCD. ![]() The cutter is a cordless drill motor and chuck controlled by some heavy duty MOSFET switches. The second arduino only controls the speed and direction of the cutter. This arduino gets HPGL format commands that give position from and to commands and it calculates all the sub stepping to get there. I don't want to risk dropping a move or mistiming a move due to USB communication glitches. The reason one arduino does all this work is I absolutely want to synchronize the x, y and z moves. I also replaced the motor driver chips with some higher capacity chips and put on heat sinks. I posted a hack on how to attach two to the same Arduino. The first is the XYZ motor controller that uses two motor shields from ADAfruit. I want to improve the handshaking, auto detect the arduinos, and process HPGL files better, plus make a better GUI. I'll need to make some software updates to the Arduinos, but the original Arduino sketches are posted on my download pages. ![]()
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