8 latched input device
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Posts: 46,084
The 74HC595 is a serial 8 bit latched OUTPUT device which can be used as per the
example in the book for controling LED's. Does anyone know the part number for
the REVERSE function?? That is I want to monitor and serially input the status
of 8 switches. I need latched inputs as the switch input may be momentary and
not seen by the Stamp if it is busy elsewhere.
Thanks Mike B.
Current project:
Stamp controlled 1/32 nd scale submarine NOT using conventional R/C
equipment..
[noparse][[/noparse]Non-text portions of this message have been removed]
example in the book for controling LED's. Does anyone know the part number for
the REVERSE function?? That is I want to monitor and serially input the status
of 8 switches. I need latched inputs as the switch input may be momentary and
not seen by the Stamp if it is busy elsewhere.
Thanks Mike B.
Current project:
Stamp controlled 1/32 nd scale submarine NOT using conventional R/C
equipment..
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
Sean
Original Message
From: "Mike Blier" <w6ffc@p...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, April 06, 2002 12:49 PM
Subject: [noparse][[/noparse]basicstamps] 8 latched input device
> The 74HC595 is a serial 8 bit latched OUTPUT device which can be used as
per the example in the book for controling LED's. Does anyone know the part
number for the REVERSE function?? That is I want to monitor and serially
input the status of 8 switches. I need latched inputs as the switch input
may be momentary and not seen by the Stamp if it is busy elsewhere.
>
> Thanks Mike B.
>
> Current project:
>
> Stamp controlled 1/32 nd scale submarine NOT using conventional R/C
equipment..
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
Mike B.
Original Message
From: "Sean Gibson" <seangib@r...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, April 06, 2002 12:48 PM
Subject: Re: [noparse][[/noparse]basicstamps] 8 latched input device
> 74LS165
> Sean
>
>
Original Message
> From: "Mike Blier" <w6ffc@p...>
> To: <basicstamps@yahoogroups.com>
> Sent: Saturday, April 06, 2002 12:49 PM
> Subject: [noparse][[/noparse]basicstamps] 8 latched input device
>
>
> > The 74HC595 is a serial 8 bit latched OUTPUT device which can be used as
> per the example in the book for controling LED's. Does anyone know the
part
> number for the REVERSE function?? That is I want to monitor and serially
> input the status of 8 switches. I need latched inputs as the switch input
> may be momentary and not seen by the Stamp if it is busy elsewhere.
> >
> > Thanks Mike B.
> >
> > Current project:
> >
> > Stamp controlled 1/32 nd scale submarine NOT using conventional R/C
> equipment..
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject
and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
--
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Ben Lennard, NCEE, Dip EE
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>From: Mike Blier <w6ffc@p...>
>To: basicstamps@yahoogroups.com
>Subject: [noparse][[/noparse]basicstamps] 8 latched input device
>Date: Sun, 7 Apr 2002 5:49 AM
>
> The 74HC595 is a serial 8 bit latched OUTPUT device which can be used as
> per the example in the book for controling LED's. Does anyone know the
> part number for the REVERSE function?? That is I want to monitor and
> serially input the status of 8 switches. I need latched inputs as the
> switch input may be momentary and not seen by the Stamp if it is busy
elsewhere.
>
> Thanks Mike B.
>
> Current project:
>
> Stamp controlled 1/32 nd scale submarine NOT using conventional R/C
equipment..
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
IC.
--
http://www.lennard.net.nz/
Ben Lennard, NCEE, Dip EE
Web Hosting and Electronics R&D
Club Coordinator, Victoria University of Wellington Hockey Club
Hm: +64 4 972 7567
Mb: +64 21 536 627
87 Spencer Street
Crofton Downs
Wellington
New Zealand
"To the optimist, the glass is half full. To the pessimist, the glass is
half empty. To the engineer, the glass is twice as big as it needs to be."
No animals were harmed in the transmission of this email, although the
Dog next door is living on borrowed time, let me tell you! Those of you
with an overwhelming fear of the unknown will be gratified to learn that
there is no hidden message revealed by reading this warning backwards.
>From: Mike Blier <w6ffc@p...>
>To: basicstamps@yahoogroups.com
>Subject: [noparse][[/noparse]basicstamps] 8 latched input device
>Date: Sun, 7 Apr 2002 5:49 AM
>
> The 74HC595 is a serial 8 bit latched OUTPUT device which can be used as
> per the example in the book for controling LED's. Does anyone know the
> part number for the REVERSE function?? That is I want to monitor and
> serially input the status of 8 switches. I need latched inputs as the
> switch input may be momentary and not seen by the Stamp if it is busy
elsewhere.
>
> Thanks Mike B.
>
> Current project:
>
> Stamp controlled 1/32 nd scale submarine NOT using conventional R/C
equipment..
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>The 74HC595 is a serial 8 bit latched OUTPUT device which can be used as
>per the example in the book for controling LED's. Does anyone know the
>part number for the REVERSE function?? That is I want to monitor and
>serially input the status of 8 switches. I need latched inputs as the
>switch input may be momentary and not seen by the Stamp if it is busy
>elsewhere.
I'm don't know of any single device that does as you request. A 4021 will
serialize data easily enough but it does not 'latch' input events on its
own. An 8255 PIA can do this but its data buss is 8 bits wide.
You can wire up a bunch of Set-Reset Flip Flops (4043 and 4044 quad SR
latches come to mind) where input events are latched. Those, in turn, can
feed a 4021 to serialize the data. You will need an additional line from
the Stamp to reset the FFs after they have been read.
You could 'roll your own' into a single chip by using a PLD. Its not that
hard to do and the parts are inexpensive. Look at the Altera and Lattice
web sites.
dwayne
Dwayne Reid <dwayner@p...>
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax
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