7 Segment Displays
Archiver
Posts: 46,084
Hello Everyone [noparse]:)[/noparse]
I'm sorry but I'm being a extremely lazy here. I'm going to trawl for
ideas. Basically I want to build a slate with 10 seven segment displays (I
found some surplus ones at 10p (15c) each), However I would like to control
and program this display Via a basic stamp.
Each figure needs to be controlled individually and preferably serially does
anyone have an idea of a good driver to do this ?
Justin
I'm sorry but I'm being a extremely lazy here. I'm going to trawl for
ideas. Basically I want to build a slate with 10 seven segment displays (I
found some surplus ones at 10p (15c) each), However I would like to control
and program this display Via a basic stamp.
Each figure needs to be controlled individually and preferably serially does
anyone have an idea of a good driver to do this ?
Justin
Comments
Our synop board might provide the I/O pins you need.
It provides 10 sections with 8 I/O each, enough to
drive 10 7-segment (incl. decimal point) directly
or 20 7-segment that are BCD controlled, or 80 modules
that are serially controlled.
Take a look http://www.boselectro.nl/synop.html
Boards are still available for 30 US$ per board plus 5 US$ shipping.
Note that serial drivers for individual I/O are yet to be written.
Send me an email at peterverkaik@b...
if it is what you are looking for.
regards peter
Oorspronkelijk bericht
Van: Justin Pentecost [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Zrgrjhuqpvq0ZQbazboBsa25OwEP9wVZZBb-H15R2dzBeBk6FDyTR7SMAt9Ss4gJe91PPjep]justin@k...[/url
Verzonden: donderdag 6 september 2001 14:14
Aan: basicstamps@yahoogroups.com
Onderwerp: [noparse][[/noparse]basicstamps] 7 Segment Displays
Hello Everyone [noparse]:)[/noparse]
I'm sorry but I'm being a extremely lazy here. I'm going to trawl for
ideas. Basically I want to build a slate with 10 seven segment displays (I
found some surplus ones at 10p (15c) each), However I would like to control
and program this display Via a basic stamp.
Each figure needs to be controlled individually and preferably serially does
anyone have an idea of a good driver to do this ?
Justin
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/
>Hello Everyone [noparse]:)[/noparse]
>
>I'm sorry but I'm being a extremely lazy here. I'm going to trawl for
>ideas. Basically I want to build a slate with 10 seven segment displays (I
>found some surplus ones at 10p (15c) each), However I would like to control
>and program this display Via a basic stamp.
>
>Each figure needs to be controlled individually and preferably serially does
>anyone have an idea of a good driver to do this ?
>
>Justin
>
>Justin -
The MAX-7219 should do what you need to do:
http://dbserv.maxim-ic.com/quick_view2.cfm?pdf_num=1339
Free samples should be availble.
Regards,
Bruce Bates
support up to 16 digits. It only costs $20 per chip and uses the shiftout
command on the basic stamp.
Go all the way down to page 20-22:
http://www.parallaxinc.com/downloads/Documentation/Application%20Kits/MAX721
9%208-Digit%20LED%20Display%20Driver/MAX7219-21%208-Digit%20LED%20Display%20
Driver.pdf
Hope this helps.
Chris Shuster
http://www.cpuman.f2s.com/
Original Message
From: "Justin Pentecost" <justin@k...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, September 06, 2001 9:14 PM
Subject: [noparse][[/noparse]basicstamps] 7 Segment Displays
> Hello Everyone [noparse]:)[/noparse]
>
> I'm sorry but I'm being a extremely lazy here. I'm going to trawl for
> ideas. Basically I want to build a slate with 10 seven segment displays
(I
> found some surplus ones at 10p (15c) each), However I would like to
control
> and program this display Via a basic stamp.
>
> Each figure needs to be controlled individually and preferably serially
does
> anyone have an idea of a good driver to do this ?
>
> Justin
>
>
> 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/
>
>
>
> >Each figure needs to be controlled individually and preferably serially does
> >anyone have an idea of a good driver to do this ?
Our EDE707 provides control of up to eight 7-segment displays (common
cathode or common anode), and also provides counter up/down and reset to
zero functionality along with leading zero blanking and lamp test. Control
is via 4 bit parallel bus. Datasheet and pricing information is at
www.elabinc.com in the EDExx IC section.
Todd Peterson
E-Lab Digital Engineering, Inc.
(816) 257-9954 FAX: (816) 257-9945
www.elabinc.com
cpuman3@h... writes:
> You consider the Max7219? You can daisy-chain-ish 2 Max's together to
> support up to 16 digits. It only costs $20 per chip and uses the shiftout
> command on the basic stamp.
>
If cost is a factor you can chain eight 74HC595s together and use SHIFTOUT as
well. The 595 is only 50 cents per part, but doesn't do some os the cool
things the MAX7219 does (like BCD decoding and brightness control).
-- Jon Williams
-- Applications Engineer, Parallax.
[noparse][[/noparse]Non-text portions of this message have been removed]
handle the repeated strobing of the digit display .
I want to write out 4 characters to a set of 4x 7 segs using a stamp and not
worry about the overhead
[noparse][[/noparse]Non-text portions of this message have been removed]
& Volts column on it.
--- In basicstamps@yahoogroups.com, Sadler Porter
<porter.sadler@s...> wrote:
>
>
> Is there a chip which decodes byte or nibble to 7 segment displays
and
> handle the repeated strobing of the digit display .
> I want to write out 4 characters to a set of 4x 7 segs using a
stamp and not
> worry about the overhead
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>Is there a chip which decodes byte or nibble to 7 segment displays and
>handle the repeated strobing of the digit display .
>I want to write out 4 characters to a set of 4x 7 segs using a stamp and not
>worry about the overhead
A part I used to use (many years ago) is a CMOS part: 4511. This takes in
4 bit data and has a latch as well as a 4 bit to 7 segment decoder.
It should still be available from many sources - try searching for
CD4511. Note that the first 2 letters will change, depending on the
manufacturer. The prefix CD refers to National Semiconductor.
I should mention, though, I haven't needed to use anything like that in
many years. I now generate the 7 segment data inside the micro and send it
to the displays as a serial bit stream feeding into shift registers. Much
cheaper and takes less pins. Take a look at the SHIFTOUT command for
examples on how to do this. In your case, I'd use 4- 74hc595 or TPIC6595
shift registers chained together and do all this using only 3 pins on the
micro (or stamp). Even better - all 3 of those input pins can also be used
as inputs if you structure your program properly.
The main difference between the 74hc595 and TPIC6595 is that the outputs on
the hc part are totem-pole outputs - this means that you have to operate
your 7 segment displays from the same power supply as the micro. The TPIC
part has open-drain outputs which allows you to operate common anode
displays from your un-regulated supply. This spreads the power dissipation
over the segment current limit resistors instead of concentrating it at the
voltage regulator.
dwayne
--
Dwayne Reid <dwayner@p...>
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax
Celebrating 18 years of Engineering Innovation (1984 - 2002)
.-. .-. .-. .-. .-. .-. .-. .-. .-. .-
`-' `-' `-' `-' `-' `-' `-' `-' `-'
Do NOT send unsolicited commercial email to this email address.
This message neither grants consent to receive unsolicited
commercial email nor is intended to solicit commercial email.
control up to eight 7-segment displays in digit mode or segment mapped if you
choose (you can control which are docoded as digits or segment mapped -- and
they can be mixed). You can also adjust the brightness from the Stamp. All
this happens through just three I/O lines ans some SHIFTOUT statements; the
MAX7219 does all the hard work.
-- Jon Williams
-- Parallax
In a message dated 1/24/2003 1:38:44 PM Central Standard Time,
porter.sadler@s... writes:
> Is there a chip which decodes byte or nibble to 7 segment displays and
> handle the repeated strobing of the digit display .
> I want to write out 4 characters to a set of 4x 7 segs using a stamp and
> not
> worry about the overhead
[noparse][[/noparse]Non-text portions of this message have been removed]
power used. i.e. It only powers one 7-seg at a time but switches between
them so fast you don't see them flickering. I found that just running 2
7-segs directly heated up my 7805 quite a bit, even with a honkin' heat sink
it was running over 100F.
Original Message
From: <selket_10027@y...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, January 24, 2003 11:46 AM
Subject: [noparse][[/noparse]basicstamps] Re: 7 Segment Displays
> The Maxim MAX7219 is designed for just that purpose. There is a Nuts
> & Volts column on it.
>
> --- In basicstamps@yahoogroups.com, Sadler Porter
> <porter.sadler@s...> wrote:
> >
> >
> > Is there a chip which decodes byte or nibble to 7 segment displays
> and
> > handle the repeated strobing of the digit display .
> > I want to write out 4 characters to a set of 4x 7 segs using a
> stamp and not
> > worry about the overhead
> >
> >
> > [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/
>
>