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
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
)
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
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
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
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',
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
Good idea.
Check out
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Shift_Register_Port_Expander
-Kip
On Sun, Jan 27, 2013 at 8:44 PM, Chris Radek ch...@timeguy.com wrote:
On Sun, Jan 27, 2013 at 06:14:56PM -0500, Kip wrote:
Greetings all! My shift registers seem to be working well as a cheap
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.
On Sun, Jan 27, 2013 at 06:14:56PM -0500, 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
That's really cool. A lot of people have asked about a simple
scheme such as this over the years,
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
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
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
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
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
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,
On Friday 28 December 2012 08:51:33 Kip Shaffer did opine:
Great Kip, bookmarked FFR. Thanks.
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
On 12/28/2012 5:15 AM, MC Cason 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
Also, there are lots of TTL to USB and RS232 converters already
assembled on Ebay - very cheap.
Cheap until you check the shipping... :(
Nah, shipping is often free from HongKong; it just takes a while:
Also, there are lots of TTL to USB and RS232 converters already
assembled on Ebay - very cheap.
Cheap until you check the shipping... :(
I've almost been caught out by this a few times - sometimes the shipping is
reasonable (or free), sometimes the shipping is more than the cost of the
Gene, I know you wanted to derive power from an RS232 port, but why not
do a port steal from a USB port.
Plenty of ma at 5vdc regulated.
Also, there are lots of TTL to USB and RS232 converters already
assembled on Ebay - very cheap.
Dave
On 12/27/2012 12:01 AM, Gene Heskett wrote:
On
On Thursday 27 December 2012 22:00:41 Dave did opine:
Gene, I know you wanted to derive power from an RS232 port, but why not
do a port steal from a USB port.
Plenty of ma at 5vdc regulated.
Also, there are lots of TTL to USB and RS232 converters already
assembled on Ebay - very cheap.
On Friday 28 December 2012 02:32:37 Eric Keller did opine:
On Thu, Dec 27, 2012 at 10:05 PM, Gene Heskett ghesk...@wdtv.com wrote:
On Thursday 27 December 2012 22:00:41 Dave did opine:
Also, there are lots of TTL to USB and RS232 converters already
assembled on Ebay - very cheap.
On Friday 28 December 2012 02:35:12 Roland Jollivet did opine:
On 28 December 2012 05:05, Gene Heskett ghesk...@wdtv.com wrote:
On Thursday 27 December 2012 22:00:41 Dave did opine:
Gene, I know you wanted to derive power from an RS232 port, but why
not do a port steal from a USB port.
Greetings all;
I went out to see if I could get this little sparkfun electronic fuse
hooked up this afternoon ran into a tall granite wall impeding any
progress. I am out of input pins on the cnc4pc C1G. But I do have a low
use pin, reserved for a G38.2 probe I intend to use as an
On 26 December 2012 22:45, Gene Heskett ghesk...@wdtv.com wrote:
I am out of input pins on the cnc4pc C1G.
How about using the serial port status pins?
http://www.linuxcnc.org/docs/html/man/man9/serport.9.html
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
On Wednesday 26 December 2012 23:50:52 andy pugh did opine:
On 26 December 2012 22:45, Gene Heskett ghesk...@wdtv.com wrote:
I am out of input pins on the cnc4pc C1G.
How about using the serial port status pins?
http://www.linuxcnc.org/docs/html/man/man9/serport.9.html
Hadn't even
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