Or mouser. http://www.mouser.com/Semiconductors/Logic-ICs/Counter-Shift-Registers/_/N-55d4h?Keyword=74hct595&FS=True http://www.mouser.com/ProductDetail/NXP-Semiconductors/74HC595N112/?qs=sGAEpiMZZMtsbn1GaJyslyeJrXytowv1%2fYsIv18i%2fyU%3d
On Tue, Feb 5, 2013 at 9:11 AM, Ralph Stirling < ralph.stirl...@wallawalla.edu> wrote: > Digikey.com . You also might consider 74HC595, 74HC497, or > 74AHC595 and 74AHC597. > > -- Ralph > ________________________________________ > From: kqt4a...@gmail.com [kqt4a...@gmail.com] > Sent: Tuesday, February 05, 2013 6:05 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Help, out of inputs on my parport > > On Sun, 27 Jan 2013, Kip 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. > > > > can someone suggest a source for the 74ls595 and 74ls597 > > > ------------------------------------------------------------------------------ > Free Next-Gen Firewall Hardware Offer > Buy your Sophos next-gen firewall before the end March 2013 > and get the hardware for free! Learn more. > http://p.sf.net/sfu/sophos-d2d-feb > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ > Free Next-Gen Firewall Hardware Offer > Buy your Sophos next-gen firewall before the end March 2013 > and get the hardware for free! Learn more. > http://p.sf.net/sfu/sophos-d2d-feb > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
