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
Re: [Emc-users] Help, out of inputs on my parport
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
Re: [Emc-users] Help, out of inputs on my parport
Or mouser. http://www.mouser.com/Semiconductors/Logic-ICs/Counter-Shift-Registers/_/N-55d4h?Keyword=74hct595FS=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
[Emc-users] Help, out of inputs on my parport
On 5 February 2013 16:11, Ralph Stirling ralph.stirl...@wallawalla.eduwrote: Digikey.com . You also might consider 74HC595, 74HC497, or 74AHC595 and 74AHC597. -- Ralph Don't use 74HC parts. Use 74HCT as these are TTL compatible. HC parts need to be driven closer to the rail, and often don't switch unless driven by CMOS chips. Otherwise find a similar part in the CD4xxx series. They switch at Vcc/2. Regards Roland -- 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
Re: [Emc-users] Help, out of inputs on my parport
On Tue, 5 Feb 2013, Roland Jollivet wrote: On 5 February 2013 16:11, Ralph Stirling ralph.stirl...@wallawalla.eduwrote: Digikey.com . You also might consider 74HC595, 74HC497, or 74AHC595 and 74AHC597. -- Ralph Don't use 74HC parts. Use 74HCT as these are TTL compatible. HC parts need to be driven closer to the rail, and often don't switch unless driven by CMOS chips. Otherwise find a similar part in the CD4xxx series. They switch at Vcc/2. great i see 74HCT597N for $0.70 and 74HCT595N for $0.80 on mouser the ls 74ls59[57] are $10.00 each does the type of inverter matter thanks richard -- 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
Re: [Emc-users] Help, out of inputs on my parport
I would imagine that the LS chips are expensive because they are obsolete. I used them because they were in my junk drawer. I would recommend using the HCT series. I see that the pin names have changed a bit from the old datasheets. STCP = Storage Register Clock, I referred to as 'Latch', formerly 'RCLK' SHCP = Shift register clock, formerly 'SRClock' DS = Serial data Input, formerly 'Ser' PL = Parallel Load, formerly 'SRLoad' -Kip On Tue, Feb 5, 2013 at 1:33 PM, kqt4a...@gmail.com wrote: On Tue, 5 Feb 2013, Roland Jollivet wrote: On 5 February 2013 16:11, Ralph Stirling ralph.stirl...@wallawalla.edu wrote: Digikey.com . You also might consider 74HC595, 74HC497, or 74AHC595 and 74AHC597. -- Ralph Don't use 74HC parts. Use 74HCT as these are TTL compatible. HC parts need to be driven closer to the rail, and often don't switch unless driven by CMOS chips. Otherwise find a similar part in the CD4xxx series. They switch at Vcc/2. great i see 74HCT597N for $0.70 and 74HCT595N for $0.80 on mouser the ls 74ls59[57] are $10.00 each does the type of inverter matter thanks richard -- 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
[Emc-users] Help, out of inputs on my parport
On 5 February 2013 20:33, kqt4a...@gmail.com wrote: On Tue, 5 Feb 2013, Roland Jollivet wrote: On 5 February 2013 16:11, Ralph Stirling ralph.stirl...@wallawalla.edu wrote: Digikey.com . You also might consider 74HC595, 74HC497, or 74AHC595 and 74AHC597. -- Ralph Don't use 74HC parts. Use 74HCT as these are TTL compatible. HC parts need to be driven closer to the rail, and often don't switch unless driven by CMOS chips. Otherwise find a similar part in the CD4xxx series. They switch at Vcc/2. great i see 74HCT597N for $0.70 and 74HCT595N for $0.80 on mouser the ls 74ls59[57] are $10.00 each does the type of inverter matter thanks richard Probably just use the 74HCT04. Any which way you'll end up using a 14pin. You could use the remaining inverters as buffers. And these look cheaper. I didn't look at the MOQ's ; http://www.futurlec.com/IC74HCT00Series.shtml -- 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
