2011/4/13 LBC <[email protected]> > 2) I'm designing the wire harness for a 2 dimensional CNC plasma cutter. > (DC > brushed motor, optical encoder, Rutex driver boards.) I'm unclear on how > to > wire up the limit switches. On our drive axis, we have a limit switch at > one > end, the other end the driver gears fall off the drive track. I've got two > switches, one for X axis, the other for Y axis which are normally closed to > be > used as limit switches on the appropriate end of the X,Y axis. I'd like to > send > that signal into the system, but I'm not clear on where I get a +5v signal > source. Obviously I'd prefer to obtain a +5v reference directly from the > parallel port. I don't see a setup pull down that enables an output pin to > always be set high (at least using the visual parallel port setup tool) > > > Can I set an "Estop out" port to use as my +5V source to my limit switch, > and > return the "results" to a parallel port input pin (10, 11, 12, 13 or 15?) > Obviously I'd have to add pull down/up resistor as appropriate to clean up > the > signal. Anybody been here before? (hmmm. or is that inverted Estop out to > generate a +5v source when ever the machine is turned on?...) > > You can get +5V from USB port on your PC, this is what I did to supply the breakout boards on my machine.
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