3 digit 7 segment led counter package?

R

Ryan Kremser

Guest
Any recommended 3 digit 7 segment counter packages ready to attach into
a circuit? I need to be able to pulse the display and have it increment
by one up to 300, also would need a reset function. Is it recommended
to buy pre made circuit or individual components to assemble myself.
I'll need 6 of these so any help would be appreciated.
 
"Ryan Kremser" <news@rkremser.endjunk.com> wrote in message
news:c269c2c74de431b18ca4b622b54474ab@news.teranews.com...
Any recommended 3 digit 7 segment counter packages ready to attach into
a circuit? I need to be able to pulse the display and have it increment
by one up to 300, also would need a reset function. Is it recommended
to buy pre made circuit or individual components to assemble myself.
I'll need 6 of these so any help would be appreciated.
Click to expand...
3 X 4026 connected to counter chips, and an and gate on the correct OPs to
reset at desired number!


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Ryan Kremser <news@rkremser.endjunk.com> wrote in
news:c269c2c74de431b18ca4b622b54474ab@news.teranews.com:

Any recommended 3 digit 7 segment counter packages ready to attach into
a circuit? I need to be able to pulse the display and have it increment
by one up to 300, also would need a reset function. Is it recommended
to buy pre made circuit or individual components to assemble myself.
I'll need 6 of these so any help would be appreciated.
Click to expand...
Easy to build once you have made the PCBs see circuit
http://members.shaw.ca/roma/three%20digits.html
roma
 
Ryan Kremser wrote:
Any recommended 3 digit 7 segment counter packages ready to attach into
a circuit? I need to be able to pulse the display and have it increment
by one up to 300, also would need a reset function. Is it recommended
to buy pre made circuit or individual components to assemble myself.
I'll need 6 of these so any help would be appreciated.
Click to expand...
Dick Smith Electronics.
Kit number K3452 AU$32.50 ea
http://www.dse.com.au/cgi-bin/dse.storefront/3f625a1402cd7c8c2741c0a87f9c06e2/Search/Run

Somewhat cheaper, but it looks the same
Altronics
Kit number K2505 $AU24.95 ea (5 off = AU$22.45 ea)
http://www.altronics.com.au/cat.asp?cat=11&grp=429&id=K2505

--

David
 
Cheap calculators can be used for this purpose. Pulse the +, 1 and "clear"
lines.
 
Hi Brian,

This is a pretty crafty idea, but you have to be careful when doing
this. Most keyboard operated devices use a micro and software to
"scan" for depressed buttons. As an example, a keyboard consisting of
16 buttons would have 4 inputs scanning to see if there is a button
depressed connecting it to one of 4 outputs that sequencially are
pulsed.

To actually do what you are suggesting, you would have to install a
gate in place of the button, and ensure that the gate enabling pulse
is long enough to pass the required scanning pulse(s) (1 or possibly
more depending on the key debounce software).

A consequence of the above would be very slow counter operation. The
calculator needs only to respond to human pulsed keystrokes (3 or 4
per second at most?), so it is likely the software is adjusted
accordingly to ensure that bouncy keyboard switches are not an issue.

Cheers from Canada!

Bob Morgoch



"Brian" <win@biggerpond.com> wrote in message news:<wwb9b.102758$bo1.23377@news-server.bigpond.net.au>...
Cheap calculators can be used for this purpose. Pulse the +, 1 and "clear"
lines.
Click to expand...
 
"Ryan Kremser" <news@rkremser.endjunk.com> wrote in message
news:c269c2c74de431b18ca4b622b54474ab@news.teranews.com...
Any recommended 3 digit 7 segment counter packages ready to attach into
a circuit? I need to be able to pulse the display and have it increment
by one up to 300, also would need a reset function. Is it recommended
to buy pre made circuit or individual components to assemble myself.
I'll need 6 of these so any help would be appreciated.
Click to expand...
take a look at http://home.comcast.net/~rcmonsen/ for a simple way to drive
a set of 7 segment displays using a PIC uController. Modifying the software
to do this counting (including debounce if necessary) will be fairly easy.
There are apnotes on doing button debounce from microchip.

Regards,
Bob Monsen
 
Ryan Kremser <news@rkremser.endjunk.com> wrote in message news:<c269c2c74de431b18ca4b622b54474ab@news.teranews.com>...
Any recommended 3 digit 7 segment counter packages ready to attach into
a circuit? I need to be able to pulse the display and have it increment
by one up to 300, also would need a reset function. Is it recommended
to buy pre made circuit or individual components to assemble myself.
I'll need 6 of these so any help would be appreciated.
Click to expand...
Try a 74c926 or thereabouts It is described as a '4-Digit Counter with
Multiplexed 7-Segment Output Drivers'.

http://www.ee.washington.edu/stores/DataSheets/cd4000/74c926.pdf

The hardest part of the exercise will be finding one though, TECS
seemed to have some in stock as I was googling for this information.

Cheers,

Mark
 
On 15 Sep 2003 15:32:26 -0700, mvandere@iprimus.com.au (Mark van der
Eynden) wrote:

Ryan Kremser <news@rkremser.endjunk.com> wrote in message news:<c269c2c74de431b18ca4b622b54474ab@news.teranews.com>...
Any recommended 3 digit 7 segment counter packages ready to attach into
a circuit? I need to be able to pulse the display and have it increment
by one up to 300, also would need a reset function. Is it recommended
to buy pre made circuit or individual components to assemble myself.
I'll need 6 of these so any help would be appreciated.

Try a 74c926 or thereabouts It is described as a '4-Digit Counter with
Multiplexed 7-Segment Output Drivers'.

http://www.ee.washington.edu/stores/DataSheets/cd4000/74c926.pdf

The hardest part of the exercise will be finding one though, TECS
seemed to have some in stock as I was googling for this information.
Click to expand...
Worldwide Electronics in Perth have them for $11.20
 
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