Digital Clock With Timer
 

Group.

I need a 24 hour countdown timer such as the CANUK118 - Digital Clock With
Timer (http://www.electronickits.com/kit/co.../canck118.htm). The
additional feature I need is the ability to shut off the timer circuit at
(say 13:00 hours), in advance of the final countdown time of (say 14:00
hours), and have the timer circuit reset automatically to the desired final
countdown time of 14:00 hours, 24 hours later. Said another way, if the
countdown time is set to activate the relay circuit at 14:00 hours and the
timer is disengaged at 13:00 hours, I don't want to have to wait until
14:01 hours to reactivate the timer circuit to avoid the relay from being
activated at 14:00 hours or 60 minuets later.

Can anyone help with this issue? Any help, guidance or referrals will be
appreciated.

Regards,

Bob

Digital Clock With Timer
 

"rt003119" schreef in bericht
m...
Group.

I need a 24 hour countdown timer such as the CANUK118 - Digital Clock With
Timer (http://www.electronickits.com/kit/co.../canck118.htm).
The additional feature I need is the ability to shut off the timer circuit
at (say 13:00 hours), in advance of the final countdown time of (say 14:00
hours), and have the timer circuit reset automatically to the desired
final countdown time of 14:00 hours, 24 hours later. Said another way, if
the countdown time is set to activate the relay circuit at 14:00 hours and
the timer is disengaged at 13:00 hours, I don't want to have to wait
until 14:01 hours to reactivate the timer circuit to avoid the relay from
being activated at 14:00 hours or 60 minuets later.

Can anyone help with this issue? Any help, guidance or referrals will be
appreciated.

Regards,

Bob


You can use a weekclock for that. On this clocks you can set one or more
alarms for every day of the week. If you cancel todays alarm(s) you can keep
tomorrows alarms active or even change them at will.

petrus bitbyter

Digital Clock With Timer
 

"petrus bitbyter" wrote
in message ll.nl...

"rt003119" schreef in bericht
m...
Group.

I need a 24 hour countdown timer such as the CANUK118 - Digital Clock With
Timer (http://www.electronickits.com/kit/co.../canck118.htm).
The additional feature I need is the ability to shut off the timer circuit
at (say 13:00 hours), in advance of the final countdown time of (say 14:00
hours), and have the timer circuit reset automatically to the desired
final countdown time of 14:00 hours, 24 hours later. Said another way, if
the countdown time is set to activate the relay circuit at 14:00 hours and
the timer is disengaged at 13:00 hours, I don't want to have to wait
until 14:01 hours to reactivate the timer circuit to avoid the relay from
being activated at 14:00 hours or 60 minuets later.

Can anyone help with this issue? Any help, guidance or referrals will be
appreciated.

Regards,

Bob

You can use a weekclock for that. On this clocks you can set one or more
alarms for every day of the week. If you cancel todays alarm(s) you can keep
tomorrows alarms active or even change them at will.

petrus bitbyter

Sake's alive, I can do this on my Cell Phone. It's not even a very
fancy one either, a Motorola W175g. I can set a daily alarm, and then
cancel it before it goes off and still have tomorrow's alarm set.

So, unless you're building this for the fun of the project, WHY?

Bill

Digital Clock With Timer
 

On Fri, 23 Oct 2009 12:02:37 -0400, "rt003119"
wrote:

Group.

I need a 24 hour countdown timer such as the CANUK118 - Digital Clock With
Timer (http://www.electronickits.com/kit/co.../canck118.htm). The
additional feature I need is the ability to shut off the timer circuit at
(say 13:00 hours), in advance of the final countdown time of (say 14:00
hours), and have the timer circuit reset automatically to the desired final
countdown time of 14:00 hours, 24 hours later. Said another way, if the
countdown time is set to activate the relay circuit at 14:00 hours and the
timer is disengaged at 13:00 hours, I don't want to have to wait until
14:01 hours to reactivate the timer circuit to avoid the relay from being
activated at 14:00 hours or 60 minuets later.

---
you'll need a few things: a SPST NO relay, (a reed relay would be fine)
a CD4001B, a 24 hour timer which you can build using three CD40103B
down-counters, an NPN like a 2N2222 and some resistors.

Here's how it would work:

First, you momentarily place SW2 into the TIMER OFF position and then
return it to the TIMER ON position. What happens when you put SW2 in
the TIMER OFF position is that it sets a latch which starts the 24 hour
timer and turns on the transistor.

The transistor, in turn, energizes the relay which connects the LM8560
TIMER OFF pin to the positive supply, disabling the timer until the 24
hour timer times out.

When that happens the latch will be reset, the 24 hour timer will stop,
and the relay will be de-energized, disconnecting the TIMER OFF pin from
the positive rail, thus enabling the timer.

Want a schematic?

Digital Clock With Timer
 

On Fri, 23 Oct 2009 12:02:37 -0400, "rt003119" wrote:

Group.

I need a 24 hour countdown timer such as the CANUK118 - Digital Clock With
Timer (http://www.electronickits.com/kit/co.../canck118.htm). The
additional feature I need is the ability to shut off the timer circuit at
(say 13:00 hours), in advance of the final countdown time of (say 14:00
hours), and have the timer circuit reset automatically to the desired final
countdown time of 14:00 hours, 24 hours later. Said another way, if the
countdown time is set to activate the relay circuit at 14:00 hours and the
timer is disengaged at 13:00 hours, I don't want to have to wait until
14:01 hours to reactivate the timer circuit to avoid the relay from being
activated at 14:00 hours or 60 minuets later.

Can anyone help with this issue? Any help, guidance or referrals will be
appreciated.

Regards,

Bob


So you want an alarm that goes off at a time you want, say 12:30 hours, but if
you hit cancel, it will not go off that day, but the next? I guess it will go
off every day at that time if you don't touch it?

You need a logic latch to kill the alarm until the clock hits midnight, and then
restores it, that's all. You can change the alarm time now because the clock
alarm is "killed" untill midnight.

If you don't want it to go off every day, but just delay one day, you need
another latch to make sure the alarm only goes once and then kills the "alarm
on" setting.

Digital Clock With Timer
 

On Fri, 23 Oct 2009 14:54:47 -0500, John Fields
wrote:

On Fri, 23 Oct 2009 12:02:37 -0400, "rt003119"
wrote:

Group.

I need a 24 hour countdown timer such as the CANUK118 - Digital Clock With
Timer (http://www.electronickits.com/kit/co.../canck118.htm). The
additional feature I need is the ability to shut off the timer circuit at
(say 13:00 hours), in advance of the final countdown time of (say 14:00
hours), and have the timer circuit reset automatically to the desired final
countdown time of 14:00 hours, 24 hours later. Said another way, if the
countdown time is set to activate the relay circuit at 14:00 hours and the
timer is disengaged at 13:00 hours, I don't want to have to wait until
14:01 hours to reactivate the timer circuit to avoid the relay from being
activated at 14:00 hours or 60 minuets later.

---
you'll need a few things: a SPST NO relay, (a reed relay would be fine)
a CD4001B, a 24 hour timer which you can build using three CD40103B
down-counters, an NPN like a 2N2222 and some resistors.

Here's how it would work:

First, you momentarily place SW2 into the TIMER OFF position and then
return it to the TIMER ON position. What happens when you put SW2 in
the TIMER OFF position is that it sets a latch which starts the 24 hour
timer and turns on the transistor.

The transistor, in turn, energizes the relay which connects the LM8560
TIMER OFF pin to the positive supply, disabling the timer until the 24
hour timer times out.

When that happens the latch will be reset, the 24 hour timer will stop,
and the relay will be de-energized, disconnecting the TIMER OFF pin from
the positive rail, thus enabling the timer.

Want a schematic?

---
Thinking about it a little bit more leads me to believe that the reed
relay can be replaced with a transistor, making the circuit smaller,
faster, better, cheaper.

Win, win, so I'm hooked...

I'll post a schematic tomorrow just for the fun of working through it.

Digital Clock With Timer
 

On Fri, 23 Oct 2009 19:05:04 -0400, wrote:

On Fri, 23 Oct 2009 12:02:37 -0400, "rt003119" wrote:

Group.

I need a 24 hour countdown timer such as the CANUK118 - Digital Clock With
Timer (http://www.electronickits.com/kit/co.../canck118.htm). The
additional feature I need is the ability to shut off the timer circuit at
(say 13:00 hours), in advance of the final countdown time of (say 14:00
hours), and have the timer circuit reset automatically to the desired final
countdown time of 14:00 hours, 24 hours later. Said another way, if the
countdown time is set to activate the relay circuit at 14:00 hours and the
timer is disengaged at 13:00 hours, I don't want to have to wait until
14:01 hours to reactivate the timer circuit to avoid the relay from being
activated at 14:00 hours or 60 minuets later.

Can anyone help with this issue? Any help, guidance or referrals will be
appreciated.

Regards,

Bob


So you want an alarm that goes off at a time you want, say 12:30 hours, but if
you hit cancel, it will not go off that day, but the next? I guess it will go
off every day at that time if you don't touch it?

You need a logic latch to kill the alarm until the clock hits midnight, and then
restores it, that's all. You can change the alarm time now because the clock
alarm is "killed" untill midnight.

---
I don't think he's asking for a way to change the alarm time, in real
time, since that's easy enough to do with the kit.

What I think he wants is a way to override the alarm from the time the
override was issued and then release the override 24 hours later.
---

If you don't want it to go off every day, but just delay one day, you need
another latch to make sure the alarm only goes once and then kills the "alarm
on" setting.

---
As I see it, he only needs one latch which is set when the override is
issued and then reset when the 24 hour timer times out.

Digital Clock With Timer
 

On Fri, 23 Oct 2009 21:12:15 -0500, John Fields
wrote:

On Fri, 23 Oct 2009 19:05:04 -0400, wrote:

On Fri, 23 Oct 2009 12:02:37 -0400, "rt003119" wrote:

Group.

I need a 24 hour countdown timer such as the CANUK118 - Digital Clock With
Timer (http://www.electronickits.com/kit/co.../canck118.htm). The
additional feature I need is the ability to shut off the timer circuit at
(say 13:00 hours), in advance of the final countdown time of (say 14:00
hours), and have the timer circuit reset automatically to the desired final
countdown time of 14:00 hours, 24 hours later. Said another way, if the
countdown time is set to activate the relay circuit at 14:00 hours and the
timer is disengaged at 13:00 hours, I don't want to have to wait until
14:01 hours to reactivate the timer circuit to avoid the relay from being
activated at 14:00 hours or 60 minuets later.

Can anyone help with this issue? Any help, guidance or referrals will be
appreciated.

Regards,

Bob


So you want an alarm that goes off at a time you want, say 12:30 hours, but if
you hit cancel, it will not go off that day, but the next? I guess it will go
off every day at that time if you don't touch it?

You need a logic latch to kill the alarm until the clock hits midnight, and then
restores it, that's all. You can change the alarm time now because the clock
alarm is "killed" untill midnight.

---
I don't think he's asking for a way to change the alarm time, in real
time, since that's easy enough to do with the kit.

What I think he wants is a way to override the alarm from the time the
override was issued and then release the override 24 hours later.
---

[snip]

Or make it just kill "next occurrence" ??

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

With Half My Brain Tied Behind My Back
Still More Clever Than Mr.Prissy Pants

Digital Clock With Timer
 

On Fri, 23 Oct 2009 19:20:56 -0700, Jim Thompson
wrote:

On Fri, 23 Oct 2009 21:12:15 -0500, John Fields
wrote:

On Fri, 23 Oct 2009 19:05:04 -0400, wrote:

On Fri, 23 Oct 2009 12:02:37 -0400, "rt003119" wrote:

Group.

I need a 24 hour countdown timer such as the CANUK118 - Digital Clock With
Timer (http://www.electronickits.com/kit/co.../canck118.htm). The
additional feature I need is the ability to shut off the timer circuit at
(say 13:00 hours), in advance of the final countdown time of (say 14:00
hours), and have the timer circuit reset automatically to the desired final
countdown time of 14:00 hours, 24 hours later. Said another way, if the
countdown time is set to activate the relay circuit at 14:00 hours and the
timer is disengaged at 13:00 hours, I don't want to have to wait until
14:01 hours to reactivate the timer circuit to avoid the relay from being
activated at 14:00 hours or 60 minuets later.

Can anyone help with this issue? Any help, guidance or referrals will be
appreciated.

Regards,

Bob


So you want an alarm that goes off at a time you want, say 12:30 hours, but if
you hit cancel, it will not go off that day, but the next? I guess it will go
off every day at that time if you don't touch it?

You need a logic latch to kill the alarm until the clock hits midnight, and then
restores it, that's all. You can change the alarm time now because the clock
alarm is "killed" untill midnight.

---
I don't think he's asking for a way to change the alarm time, in real
time, since that's easy enough to do with the kit.

What I think he wants is a way to override the alarm from the time the
override was issued and then release the override 24 hours later.
---

[snip]

Or make it just kill "next occurrence" ??

---
Yup.

That was the plan I outlined and, after that, to allow the next
occurrence to trigger the alarm transparently if it hadn't been
overridden as well.


JF

Digital Clock With Timer
 

On Fri, 23 Oct 2009 19:07:00 -0500, John Fields
wrote:


---
Thinking about it a little bit more leads me to believe that the reed
relay can be replaced with a transistor, making the circuit smaller,
faster, better, cheaper.

Win, win, so I'm hooked...

I'll post a schematic tomorrow just for the fun of working through it.

---
Hmm...

Ran into a snag, but I ought to have it worked out today, so I'll post
the circuit when that happens.

JF