Hi Kip What team are you working with? I am working with 1138, Eagle Engineering, in West Hills CA
Ray M. --J. Ray Mitchell Jr. jrmitche...@gmail.com (818)324-7573 A foolish faith in authority is the worst enemy of truth. - Einstein On Sun, Jan 27, 2013 at 3:14 PM, Kip <k...@shafferhouse.org> wrote: > Greetings all! My shift registers seem to be working well as a cheap > and easy port expander! Apologies for how long it took me to write it > up, but we are currently in the middle of the FIRST Robotics Challenge > build season, so I'm spending almost every evening mentoring high school > students. > > I've attached a schematic of the circuit used. Notice it creates 16 > output and 16 input lines using only 3 output and 1 input pin on the > parallel port. > > I also attached the .comp file to drive it. It count base-thread ticks > for timing. I have it configured to update every 1 ms with my system, > but this is configurable. While 1 ms is too slow for micro-stepping, it > is plenty fast enough to detect the pulses from my cooling fan > tachometers, turning pumps on and off, reading control panel buttons, > and blinking status LEDs. > > The complete write-up can be found here: > > http://www.shafferhouse.org/linuxcnc/LinuxCNCShiftRegisters.pdf > > It goes into a lot of detail that is probably too basic for most of the > readers of this list, but please let me know if there are things you > would like me to add. > > Enjoy! > -Kip > > On Thu, 2013-01-03 at 07:18 +0200, Marius Liebenberg wrote: > > That sounds impressive. I am looking forward to seeing it. > > > > On 2013/01/02 10:03 PM, Kip Shaffer wrote: > > > Absolutely! I just finished wiring up the real (non-prototype) > interface > > > card yesterday. As soon as I make sure everything is working, I'll > post > > > the wiring diagram and the HAL module. It appears that even the > > > high-latency (1ms) shift register lines are fast enough to directly > read > > > the tachometer signal from my cooling fans (120 Hz)! > > > > > > > > > > > > > > > On Wed, Jan 2, 2013 at 2:11 PM, Marius Liebenberg < > mar...@mastercut.co.za>wrote: > > > > > >> Kip, > > >> Would you be willing to share your module. I am in need of a similar > > >> solution. > > >> Marius > > >> > > >> On 2012/12/28 02:54 PM, Kip Shaffer wrote: > > >>> Gene, > > >>> Not sure if you would be interested in the approach I'm using, > but it > > >>> may help you or others who are in a similar predicament. > > >>> > > >>> You can use shift registers to add as many additional lines as you > want. > > >>> For example, you can take 3 output lines on your parallel port, > and > > >> turn > > >>> them into 8, 16, 24 or more output lines. Shift registers come in > two > > >>> varieties: Serial-In Parallel-Out, which you would use to create more > > >>> output lines, and Parallel-In Serial-Out which you can use to create > more > > >>> input lines. > > >>> > > >>> I wrote a HAL module to implement my setup, which uses 4 pins on the > > >>> parallel port to create 16 output and 16 input lines. I use these > lines > > >>> for higher-latency signals, since it takes about 1 ms to shift all > the > > >> bits > > >>> in and out. > > >>> > > >>> There is a good article explaining it here: > > >>> > > >>> > > >> > http://robots.freehostia.com/Software/ShiftRegister/ShiftRegisterBody.html > > >>> -Kip > > >>> > > >>> > > >>> On Fri, Dec 28, 2012 at 5:15 AM, MC Cason <farmerboy1...@yahoo.com> > > >> wrote: > > >>>> On 12/28/2012 03:10 AM, Steve Blackmore wrote: > > >>>>> On Fri, 28 Dec 2012 02:34:37 -0500, you wrote: > > >>>>> > > >>>>> > > >>>>>> Mainly the 3 weeks to a month it takes from mainland china for > > >> delivery. > > >>>>>> But since I've decided to sacrifice the one pin I was saving for a > > >> home > > >>>>>> pin, that is the path I'll take. > > >>>>> That seems a long time? I've had several packages from China most > have > > >>>>> taken 4 or 5 days, none longer than 10 days from Shanghai to my > > >> doorstep > > >>>>> in UK. They are usually in the country within 48 hours, the delays > are > > >>>>> always here! > > >>>>> > > >>>>> Steve Blackmore > > >>>>> -- > > >>>> Here in the Southern part of the US, It regularly takes > between 10 > > >>>> days, and 2 weeks for items to arrive from Shenzhen, or Hong Kong, > > >>>> Longer, from Shanghai, or Guandong. The latest set of boards I had > > >>>> made, were air flighted out of Hong Kong, on the 19th. According to > the > > >>>> tracking number, they haven't landed yet... > > >>>> > > >>>> -- > > >>>> MC Cason - Assocaite Developer - Eagle3D > > >>>> Created by: Matthias Weißer > > >>>> > > >>>> > > >>>> > > >>>> > > >>>> > > >> > ------------------------------------------------------------------------------ > > >>>> Master HTML5, CSS3, ASP.NET, MVC, AJAX, Knockout.js, Web API and > > >>>> much more. Get web development skills now with LearnDevNow - > > >>>> 350+ hours of step-by-step video tutorials by Microsoft MVPs and > > >> experts. > > >>>> SALE $99.99 this month only -- learn more at: > > >>>> http://p.sf.net/sfu/learnmore_122812 > > >>>> _______________________________________________ > > >>>> Emc-users mailing list > > >>>> Emc-users@lists.sourceforge.net > > >>>> https://lists.sourceforge.net/lists/listinfo/emc-users > > >>>> > > >> -- > > >> Regards / Groete > > >> > > >> Marius D. Liebenberg > > >> MasterCut cc > > >> Cel: +27 82 698 3251 > > >> Tel: +27 12 743 6064 > > >> Fax: +27 86 551 8029 > > >> Skype: marius_d.liebenberg > > >> Skype Me^(TM)! <skype:marius_d.liebenberg?call> > > >> Get Skype <http://www.skype.com/go/download> and call me for free. > > >> > > >> > > >> > > >> > > >> --- > > >> avast! 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