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#1
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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 |
#2
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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 |
#3
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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 |
#4
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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? |
#5
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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. |
#6
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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. |
#8
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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 | | | Voice480)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 |
#9
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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 |
#10
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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 |
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