manually operated 2 digit up/down counter

scarlet · Aug 1, 2005

Hi,

I need to build a 2 digit (00-99) up/down counter.

the system must have an "count up" button and a "count down" button.

when the "count up" button is pressed the counter must add 1 tot it's
current amount
similar for "count down" ...

somebody is operating the count up, and someone else is operating the count
down button, to monitor a production process. Every time an order comes in,
a person presses the "count up" button. someone else produces the order, and
when ready presses the "count down" button

this way everyone can see how many more oders are "pending" ...

I'm sure there is a simple solution for this, but I haven't found it yet

Please help

Thanks

Pascal

P.S. To reply, remove the "+" from the Email adress

Ken Taylor · Aug 1, 2005

"scarlet" <pascal@+ppsoffice.com> wrote in message
news:ONydneJZ9J8zAXPfRVnyjg@scarlet.biz...

Hi,

I need to build a 2 digit (00-99) up/down counter.

the system must have an "count up" button and a "count down" button.

when the "count up" button is pressed the counter must add 1 tot it's
current amount
similar for "count down" ...

somebody is operating the count up, and someone else is operating the
count
down button, to monitor a production process. Every time an order comes
in,
a person presses the "count up" button. someone else produces the order,
and
when ready presses the "count down" button

this way everyone can see how many more oders are "pending" ...

I'm sure there is a simple solution for this, but I haven't found it yet

Please help

Thanks

Pascal

P.S. To reply, remove the "+" from the Email adress

Search for "up/down counter", or check out PIC's.

Ken

Spehro Pefhany · Aug 1, 2005

On Tue, 2 Aug 2005 10:50:00 +1200, the renowned "Ken Taylor"
<ken123@xtra.co.nz> wrote:

"scarlet" <pascal@+ppsoffice.com> wrote in message
news:ONydneJZ9J8zAXPfRVnyjg@scarlet.biz...
Hi,

I need to build a 2 digit (00-99) up/down counter.

the system must have an "count up" button and a "count down" button.

when the "count up" button is pressed the counter must add 1 tot it's
current amount
similar for "count down" ...

somebody is operating the count up, and someone else is operating the
count
down button, to monitor a production process. Every time an order comes
in,
a person presses the "count up" button. someone else produces the order,
and
when ready presses the "count down" button

this way everyone can see how many more oders are "pending" ...

I'm sure there is a simple solution for this, but I haven't found it yet

Please help

Thanks

Pascal

P.S. To reply, remove the "+" from the Email adress

Search for "up/down counter", or check out PIC's.

Ken

I'm with "Telecom" on this one.

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

samIam · Aug 1, 2005

I need to build a 2 digit (00-99) up/down counter.

This project screams "synchronous binary counter" aka
state machine.

You can implement that easily within one PALx chip. Probably a
22v10 considering the number of outputs youd need

DaveM · Aug 1, 2005

"scarlet" <pascal@+ppsoffice.com> wrote in message
news:ONydneJZ9J8zAXPfRVnyjg@scarlet.biz...

Hi,

I need to build a 2 digit (00-99) up/down counter.

the system must have an "count up" button and a "count down" button.

when the "count up" button is pressed the counter must add 1 tot it's
current amount
similar for "count down" ...

somebody is operating the count up, and someone else is operating the
count
down button, to monitor a production process. Every time an order comes
in,
a person presses the "count up" button. someone else produces the order,
and
when ready presses the "count down" button

this way everyone can see how many more oders are "pending" ...

I'm sure there is a simple solution for this, but I haven't found it yet

Please help

Thanks

Pascal

P.S. To reply, remove the "+" from the Email adress

Check out the datasheets for the CD4029 presettable Up/Down counter, and the
CD4056 BCD-7 segment decoder-driver. They will do what you need, in
addition to giving you the ability to preset a count into the counters.
You'll need additional logic to prevent the count from going from 00 to 99
in case of a down command when the count is at 00.
Alternatively, a PIC is a very good choice here, but requires a bit of
coding to be done. Do whichever is more comfortable for you

--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!
>

Jim Thompson · Aug 1, 2005

On Tue, 2 Aug 2005 00:02:01 +0200, "scarlet" <pascal@+ppsoffice.com>
wrote:

Hi,

I need to build a 2 digit (00-99) up/down counter.

the system must have an "count up" button and a "count down" button.

when the "count up" button is pressed the counter must add 1 tot it's
current amount
similar for "count down" ...

somebody is operating the count up, and someone else is operating the count
down button, to monitor a production process. Every time an order comes in,
a person presses the "count up" button. someone else produces the order, and
when ready presses the "count down" button

this way everyone can see how many more oders are "pending" ...

I'm sure there is a simple solution for this, but I haven't found it yet

Please help

Thanks

Pascal

P.S. To reply, remove the "+" from the Email adress

480)460-2350 | |
| E-mail Address at Website Fax

Ken Taylor · Aug 2, 2005

"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote in message
news:i9bte1thq5pvote22qn51k29c2brqbkbb1@4ax.com...

On Tue, 2 Aug 2005 10:50:00 +1200, the renowned "Ken Taylor"
ken123@xtra.co.nz> wrote:

"scarlet" <pascal@+ppsoffice.com> wrote in message
news:ONydneJZ9J8zAXPfRVnyjg@scarlet.biz...
Hi,

I need to build a 2 digit (00-99) up/down counter.

the system must have an "count up" button and a "count down" button.

when the "count up" button is pressed the counter must add 1 tot it's
current amount
similar for "count down" ...

somebody is operating the count up, and someone else is operating the
count
down button, to monitor a production process. Every time an order comes
in,
a person presses the "count up" button. someone else produces the order,
and
when ready presses the "count down" button

this way everyone can see how many more oders are "pending" ...

I'm sure there is a simple solution for this, but I haven't found it yet

Please help

Thanks

Pascal

P.S. To reply, remove the "+" from the Email adress

Search for "up/down counter", or check out PIC's.

Ken

I'm with "Telecom" on this one.

Best regards,
Spehro Pefhany
--
Don't tell me you actually *read* the book?

Ken

Ben Bradley · Aug 2, 2005

On Tue, 2 Aug 2005 00:02:01 +0200, "scarlet" <pascal@+ppsoffice.com>
wrote:

Hi,

I need to build a 2 digit (00-99) up/down counter.

the system must have an "count up" button and a "count down" button.

when the "count up" button is pressed the counter must add 1 tot it's
current amount
similar for "count down" ...

somebody is operating the count up, and someone else is operating the count
down button, to monitor a production process. Every time an order comes in,
a person presses the "count up" button. someone else produces the order, and
when ready presses the "count down" button

this way everyone can see how many more oders are "pending" ...

I'm sure there is a simple solution for this, but I haven't found it yet

Get an old 386/486 machine running MS-DOS (used to be a few dollars
at any thrift store but I think they quit accepting computers this
old) and write a quickbasic program to do this function. Have one key
be "count up" and another key be "count down."

Please help

Thanks

Pascal

P.S. To reply, remove the "+" from the Email adress

-----
http://www.mindspring.com/~benbradley

Clive Tobin · Aug 2, 2005

scarlet wrote:

I need to build a 2 digit (00-99) up/down counter.
the system must have an "count up" button and a "count down" button.

To heck with PICs and programming and incomprehensible instructions, or
using a whole big computer!

I suggest using a couple of CD40110BE ICs which are exactly what you
want, they are cascadable up-down decade counters with separate up and
down inputs, with 7-segment decoder-driver built in. They are not so
popular any more but TI still makes them and Digi-Key has zillions
(hundreds, anyway) in stock at about $1 each.

You need resistors to limit the current to the CC readouts, and you
might need a bounceless pushbutton circuit on the inputs. The latter
can be made with an SPDT switch and cross-coupled CMOS inverters, with
no other parts needed. You also need a Reset button or else power-on
reset.

Spehro Pefhany · Aug 2, 2005

On Tue, 2 Aug 2005 14:02:21 +1200, the renowned "Ken Taylor"
<ken123@xtra.co.nz> wrote:

Don't tell me you actually *read* the book?
Ken

Sure did, pretty much in one sitting. I always wonder what interesting
stuff the author might have left out for whatever reasons, but that's
another story. ;-) Thanks for the pointer.

For the OP:

Here's a slightly arcane fragment of midrange PIC code from Dimitry
Kiryashov for increment of a packed BCD number (the PIC does not have
a decimal adjust instruction so you have to write code to correct
using the DC (digit carry) flag): reg is some arbitrary byte in the
current ram bank.

incf reg,F
movlw 0x66
addwf reg,F
skpndc
andlw 0xF0
skpnc
andlw 0x0F
subwf reg,F

The zero flag is valid at the end so you can use that to indicate when
a carry should take place if you have multiple bytes

And for decrement:

movlw 0x01
subwf reg,W
skpdc
xorlw 0x06
skpc
xorlw 0x60
movwf reg

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

Fred Bloggs · Aug 2, 2005

I need to build a 2 digit (00-99) up/down counter.

the system must have an "count up" button and a "count down" button.

when the "count up" button is pressed the counter must add 1 tot it's
current amount
similar for "count down" ...

somebody is operating the count up, and someone else is operating the count
down button, to monitor a production process. Every time an order comes in,
a person presses the "count up" button. someone else produces the order, and
when ready presses the "count down" button

this way everyone can see how many more oders are "pending" ...

I'm sure there is a simple solution for this, but I haven't found it yet

The 40110 idea seems best, and the circuit would look something like this:
View in a fixed-width font such as Courier.

common
cathode
+-CD40110B-+ +---------+
--- | | | |
+---o o-+ +---------|RST a|-R---| |
| sw1 | UP | | | | a |
| | +---+ | | b|-R---| --- |
| +--|OS1|---|--------->CKUP | | | | |
| +---+ | | c|-R---| f| |b |
| +---+ | | | | --- |
| +--|OS2|---|--------->CKDN d|-R---| e| g | |
| | +---+ | | | | | |c |
| --- | DWN | |___ e|-R---| --- |
+---o o-+ | +----|TEN | | d |
| sw2 | | | f|-R---| |
--- | | | | | |
/// | +----|LEN g|-R---| |
| | | | +----+----+
| --- | | |
| /// |BRW CRY | ---
| +----------+ ///
| | |
| | |
VDD | +-------+ |
| | | |
| --- | | +---------+
+---o o---+ | | common
sw3 | | | cathode
| | | +-CD40110B-+ +---------+
+---+ | | | | | | |
+--|OS3|--+---------|RST a|-R---| |
| +---+ | | | | | a |
| RST | | | b|-R---| --- |
| | +-->CKUP | | | | |
| | | c|-R---| f| |b |
| | | | | --- |
| +----->CKDN d|-R---| e| g | |
| | | | | |c |
| |___ e|-R---| --- |
| +-----|TEN | | d |
| | | f|-R---| |
| | | | | |
| +-----|LEN g|-R---| |
| | | | +----+----+
| --- | | |
| /// |BRW CRY | ---
| +----------+ ///
| |
| |
+---------------------+

SW1 UP COUNT MOMENTARY NORMALLY OPEN

SW2 DOWN COUNT MOMENTARY NORMALLY OPEN

SW3 RESET MOMENTARY NORMALLY OPEN

OS1,OS2 DEBOUNCE ONE-SHOTS

OS3 RESET ONE-SHOT

OS1,OS2 DEBOUNCE ONE-SHOT CKTS (2)

VDD
|
+---------+---+
| | |
| +------------LM555
[100K] | VDD RST |
| | |
| | |
| | OUT |-----> output
from >--[470]---+---|THRESH |
switch | | |
+---|TRIG DIS |
| | |
| | CON |
| | |
=== | GND |
0.47U| +---------------+
| |
| |
+-----------+
|
---
///

OS3 RESET ONE-SHOT CKT

+----------+
| |
--- |
/// +-------CD4013
| SET |
| |
VDD>----|D Q|------+--[10K]--> output
| | |
| | [100K]
from >---------->CK | |
BRW | _| |
| Q|--||--+
| RST | 0.1U |
+-----------+ |
| |
| |
+---[1M]-----+

+---------+
| |
| +-------CD4013
| | SET |
| | |
+---|D Q|-
| | |
| | |
+--->CK |
| | _|
| | Q|-
| | RST |
| +-----------+
| |
+---------+
|
---
///

For VDD=5V supply make display R=220 ohms, for VDD=12V use R=1K.

Ken Taylor · Aug 2, 2005

"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote in message
news:d1lue1pa56h95gestqh6f2o1jckmhbrncb@4ax.com...

On Tue, 2 Aug 2005 14:02:21 +1200, the renowned "Ken Taylor"
ken123@xtra.co.nz> wrote:

Don't tell me you actually *read* the book?
Ken

Sure did, pretty much in one sitting. I always wonder what interesting
stuff the author might have left out for whatever reasons, but that's
another story. ;-) Thanks for the pointer.

For the OP:

Here's a slightly arcane fragment of midrange PIC code from Dimitry
Kiryashov for increment of a packed BCD number (the PIC does not have
a decimal adjust instruction so you have to write code to correct
using the DC (digit carry) flag): reg is some arbitrary byte in the
current ram bank.

incf reg,F
movlw 0x66
addwf reg,F
skpndc
andlw 0xF0
skpnc
andlw 0x0F
subwf reg,F

The zero flag is valid at the end so you can use that to indicate when
a carry should take place if you have multiple bytes

And for decrement:

movlw 0x01
subwf reg,W
skpdc
xorlw 0x06
skpc
xorlw 0x60
movwf reg

Best regards,
Spehro Pefhany
--
Glad you enjoyed it. We had a great time on the island, and I had a lot of

fun rebuilding a telco. I'm off to Pitcairn Island in a few weeks to look at
their infrastructure - fun in the sun!

Anyhoo, many moons ago I built a chess timer based on one of the 74C92x
family (I forget which one now), which is essentially the same idea. However
by the time you put all the glue bits next to any of these 74xxx family
chips to get a display counter going, you may as well use a PIC which can
then do 'other stuff' as it is required (and it will be).

One thing I'd be dubious about in an application such as the OP is looking
at is what happens when both orderer and picker push a button at the same
time, or maybe you want to have several people doing either or each task and
therefore increase the risk of simultaneous events. Having done a much
larger system (full inventory tracking as well as pick-list functionality),
I can appreciate the need for an orderly and predictable handling of such
events..

Cheers.

Ken

Fred Bloggs · Aug 3, 2005

One thing I'd be dubious about in an application such as the OP is looking
at is what happens when both orderer and picker push a button at the same
time,

In the extremely unlikely event the orderer and picker press their
switches within 0.0000001 seconds of each other, the result will be that
a count *may* not register for one of them but not both. Both users have
visual feedback by way of the display, so that the orderer is expecting
either an increment or stay the same, and a lost count would mean he/she
sees a decrement. My, my, my, ooh and ahhh, what a catastrophe, he/she
merely re-presses the momentary. The case of picker expecting either
decrement or stay the same seeing an increment is likewise the same.

or maybe you want to have several people doing either or each task and
therefore increase the risk of simultaneous events.

Ehhh big deal- then each switch registers with a task latch that is
sequentially serviced by a simple scan circuit and cleared afterwards-
nothing insurmountable there.

Having done a much
larger system (full inventory tracking as well as pick-list functionality),
I can appreciate the need for an orderly and predictable handling of such
events..

IOW, something that is conceptually simple....

Jonathan Kirwan · Aug 3, 2005

On Wed, 03 Aug 2005 10:56:30 GMT, Fred Bloggs <nospam@nospam.com>
wrote:

IOW, something that is conceptually simple....

.... becomes yet another microcontroller project.

Jon

manually operated 2 digit up/down counter

scarlet

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