Re: [Emc-users] RepRap RAMPS stepper controller board with LinuxCNC?

[Gene H. <ghe...@wd...>]

On Monday 26 November 2012 11:07:02 Kip did opine:

> Scott,
>    I am working to add a latching shift register to my parallel port in
> LinuxCNC to expand the number of bits available where latency is less of
> a concern.
> 
> My original thought was to use an Arduino nano to control these
> functions, as I have several laying around.  But I quickly ran out of
> pins.  Then I was going to use shift registers to expand the Arduino. 
> Finally I realized that the arduino wasn't at all necessary, as I could
> directly drive the shift registers with the parallel port.  This has
> the added bonus that I no longer have to run a USB cable to my machine,
> along side the parallel port.
> 
> My plan is to shift data in and out simultaneously by using the same
> clock and latch pins for Serial-In Parallel-Out (SIPO) and Parallel-In
> Serial Out (PISO) shift registers.  This will consume 3 output pins and
> 1 input pin on the parallel port.  I'll be using it it drive 16 output
> pins and read 16 input pins in my machine.
> 
> If this sounds useful, I'll keep you posted with my progress.
> -Kip
> 
It does sound interesting Kip, for controlling such as tool turrets, 
coolant floods, air sweeps, etc.  So please do keep us in the loop.
> 
> 
> 
> 
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Cheers, Gene
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