Automatic countdown reset timer?
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From: ehsjr on 8 Jul 2010 14:00 BoyntonStu wrote: > On Jul 8, 8:54 am, BoyntonStu <boynton...(a)gmail.com> wrote: > >>On Jul 8, 8:07 am, default <defa...(a)defaulter.net> wrote: >> >> >> >> >>>On Wed, 7 Jul 2010 19:33:48 -0700 (PDT), BoyntonStu >> >>><boynton...(a)gmail.com> wrote: >>> >>>>Problem: >> >>>>Sense a person in a room. >> >>>>Trigger a countdown timer that is preset to a fixed time when a person >>>>is sensed. >> >>>>(A motion detector or a beam breaker is acceptable) >> >>>>The timer will control a 110 VAC device that is normally off. >> >>>>If a different sensor is triggered elsewhere in the house within the >>>>countdown period, reset the timer to the original preset time. >> >>>>Suggestions? >> >>>Sounds like you already have a pretty good idea of what you are doing >>>or want to do. >> >>>A single 555 monostable triggered by an inexpensive off-the-shelf >>>motion detector with an external reset. >> >>>But you are probably leaving something out - like what precision do >>>you want, and does time need to be adjusted with some degree of >>>accuracy and will it change often, how user-friendly, etc.. >>>-- >> >>5 minute time accuracy is fine. >> >>You walk into a room, the motion detector sees you and it sends a >>signal to the timer/controller which activates a 5 Amp 110 Vac circuit >>for let's say 45 minutes.. >> >>If you walk around the room and the sensor sees you again within the >>45 minutes; nothing happens. >> >>Only after the timer counts down will that room sensor reset the >>timer.. >> >>However, If you, or another person goes into another room and its >>sensor detects movement withing the 45 minute countdown, the timer/ >>controller resets to 45 minutes. >> >>Is this clear? > > > Perhaps I made it too complicated. > > All sensor signals will set the timer to 45 minutes. > > IOW After the last sensor detects motion and signals the timer, it > will count down 45 minutes. > > That would make it much simpler. So, any sensed activity first resets the counter to 0, then starts it. When the counter starts, a 5 amp 110 VAC circuit is completed. The counter runs for 45 minutes. If and when 45 minutes is reached on the counter, the 5 amp 110 VAC circuit is opened. You've just described a motion sensor switch with a delayed off. They are commercially available. Here's a link to one: http://www.x10.com/products/x10_ms16a.htm There are many other manufacturers that make motion sensing, delayed off switches that are used to turn the lights on in a room when there is activity, then turn them off x amount of time after the activity stops. Google to check out what's available. Ed
From: BoyntonStu on 9 Jul 2010 08:37 On Jul 8, 2:00 pm, ehsjr <eh...(a)nospamverizon.net> wrote: > BoyntonStu wrote: > > On Jul 8, 8:54 am, BoyntonStu <boynton...(a)gmail.com> wrote: > > >>On Jul 8, 8:07 am, default <defa...(a)defaulter.net> wrote: > > >>>On Wed, 7 Jul 2010 19:33:48 -0700 (PDT), BoyntonStu > > >>><boynton...(a)gmail.com> wrote: > > >>>>Problem: > > >>>>Sense a person in a room. > > >>>>Trigger a countdown timer that is preset to a fixed time when a person > >>>>is sensed. > > >>>>(A motion detector or a beam breaker is acceptable) > > >>>>The timer will control a 110 VAC device that is normally off. > > >>>>If a different sensor is triggered elsewhere in the house within the > >>>>countdown period, reset the timer to the original preset time. > > >>>>Suggestions? > > >>>Sounds like you already have a pretty good idea of what you are doing > >>>or want to do. > > >>>A single 555 monostable triggered by an inexpensive off-the-shelf > >>>motion detector with an external reset. > > >>>But you are probably leaving something out - like what precision do > >>>you want, and does time need to be adjusted with some degree of > >>>accuracy and will it change often, how user-friendly, etc.. > >>>-- > > >>5 minute time accuracy is fine. > > >>You walk into a room, the motion detector sees you and it sends a > >>signal to the timer/controller which activates a 5 Amp 110 Vac circuit > >>for let's say 45 minutes.. > > >>If you walk around the room and the sensor sees you again within the > >>45 minutes; nothing happens. > > >>Only after the timer counts down will that room sensor reset the > >>timer.. > > >>However, If you, or another person goes into another room and its > >>sensor detects movement withing the 45 minute countdown, the timer/ > >>controller resets to 45 minutes. > > >>Is this clear? > > > Perhaps I made it too complicated. > > > All sensor signals will set the timer to 45 minutes. > > > IOW After the last sensor detects motion and signals the timer, it > > will count down 45 minutes. > > > That would make it much simpler. > > So, any sensed activity first resets the counter to 0, > then starts it. When the counter starts, a 5 amp 110 VAC > circuit is completed. The counter runs for 45 minutes. > If and when 45 minutes is reached on the counter, the > 5 amp 110 VAC circuit is opened. You've just described > a motion sensor switch with a delayed off. They are > commercially available. > > Here's a link to one:http://www.x10.com/products/x10_ms16a.htm > > There are many other manufacturers that make motion sensing, > delayed off switches that are used to turn the lights on in > a room when there is activity, then turn them off x amount > of time after the activity stops. Google to check out what's > available. > > Ed Thanks Ed, Good find. A few questions: Can all sensors control the same 110 VAC device? The motion detectors are AAA powered do you know of any hard wired devices? (I can't imagine them hooked to Wally-Mart chargers) Thanks again.
From: ehsjr on 9 Jul 2010 12:22 BoyntonStu wrote: > On Jul 8, 2:00 pm, ehsjr <eh...(a)nospamverizon.net> wrote: > >>BoyntonStu wrote: >> >>>On Jul 8, 8:54 am, BoyntonStu <boynton...(a)gmail.com> wrote: >> >>>>On Jul 8, 8:07 am, default <defa...(a)defaulter.net> wrote: >> >>>>>On Wed, 7 Jul 2010 19:33:48 -0700 (PDT), BoyntonStu >> >>>>><boynton...(a)gmail.com> wrote: >> >>>>>>Problem: >> >>>>>>Sense a person in a room. >> >>>>>>Trigger a countdown timer that is preset to a fixed time when a person >>>>>>is sensed. >> >>>>>>(A motion detector or a beam breaker is acceptable) >> >>>>>>The timer will control a 110 VAC device that is normally off. >> >>>>>>If a different sensor is triggered elsewhere in the house within the >>>>>>countdown period, reset the timer to the original preset time. >> >>>>>>Suggestions? >> >>>>>Sounds like you already have a pretty good idea of what you are doing >>>>>or want to do. >> >>>>>A single 555 monostable triggered by an inexpensive off-the-shelf >>>>>motion detector with an external reset. >> >>>>>But you are probably leaving something out - like what precision do >>>>>you want, and does time need to be adjusted with some degree of >>>>>accuracy and will it change often, how user-friendly, etc.. >>>>>-- >> >>>>5 minute time accuracy is fine. >> >>>>You walk into a room, the motion detector sees you and it sends a >>>>signal to the timer/controller which activates a 5 Amp 110 Vac circuit >>>>for let's say 45 minutes.. >> >>>>If you walk around the room and the sensor sees you again within the >>>>45 minutes; nothing happens. >> >>>>Only after the timer counts down will that room sensor reset the >>>>timer.. >> >>>>However, If you, or another person goes into another room and its >>>>sensor detects movement withing the 45 minute countdown, the timer/ >>>>controller resets to 45 minutes. >> >>>>Is this clear? >> >>>Perhaps I made it too complicated. >> >>>All sensor signals will set the timer to 45 minutes. >> >>>IOW After the last sensor detects motion and signals the timer, it >>>will count down 45 minutes. >> >>>That would make it much simpler. >> >>So, any sensed activity first resets the counter to 0, >>then starts it. When the counter starts, a 5 amp 110 VAC >>circuit is completed. The counter runs for 45 minutes. >>If and when 45 minutes is reached on the counter, the >>5 amp 110 VAC circuit is opened. You've just described >>a motion sensor switch with a delayed off. They are >>commercially available. >> >>Here's a link to one:http://www.x10.com/products/x10_ms16a.htm >> >>There are many other manufacturers that make motion sensing, >>delayed off switches that are used to turn the lights on in >>a room when there is activity, then turn them off x amount >>of time after the activity stops. Google to check out what's >>available. >> >>Ed > > > Thanks Ed, > > Good find. > > A few questions: > > Can all sensors control the same 110 VAC device? Yes. But there is a limited range of 20' according to the info at the url cited above. > > The motion detectors are AAA powered do you know of any hard wired > devices? Yes, there are hard wired motion sensor switches. I've walked into rooms where the lights turn on upon entry - a bit startling the first time that happened - and turn off some time after I've left. Google to find the specs - I don't know what's available in terms of delay off times, area coverage, etc. Ed > > (I can't imagine them hooked to Wally-Mart chargers) > > Thanks again.
From: BoyntonStu on 10 Jul 2010 13:40
On Jul 9, 12:22 pm, ehsjr <eh...(a)nospamverizon.net> wrote: > BoyntonStu wrote: > > On Jul 8, 2:00 pm, ehsjr <eh...(a)nospamverizon.net> wrote: > > >>BoyntonStu wrote: > > >>>On Jul 8, 8:54 am, BoyntonStu <boynton...(a)gmail.com> wrote: > > >>>>On Jul 8, 8:07 am, default <defa...(a)defaulter.net> wrote: > > >>>>>On Wed, 7 Jul 2010 19:33:48 -0700 (PDT), BoyntonStu > > >>>>><boynton...(a)gmail.com> wrote: > > >>>>>>Problem: > > >>>>>>Sense a person in a room. > > >>>>>>Trigger a countdown timer that is preset to a fixed time when a person > >>>>>>is sensed. > > >>>>>>(A motion detector or a beam breaker is acceptable) > > >>>>>>The timer will control a 110 VAC device that is normally off. > > >>>>>>If a different sensor is triggered elsewhere in the house within the > >>>>>>countdown period, reset the timer to the original preset time. > > >>>>>>Suggestions? > > >>>>>Sounds like you already have a pretty good idea of what you are doing > >>>>>or want to do. > > >>>>>A single 555 monostable triggered by an inexpensive off-the-shelf > >>>>>motion detector with an external reset. > > >>>>>But you are probably leaving something out - like what precision do > >>>>>you want, and does time need to be adjusted with some degree of > >>>>>accuracy and will it change often, how user-friendly, etc.. > >>>>>-- > > >>>>5 minute time accuracy is fine. > > >>>>You walk into a room, the motion detector sees you and it sends a > >>>>signal to the timer/controller which activates a 5 Amp 110 Vac circuit > >>>>for let's say 45 minutes.. > > >>>>If you walk around the room and the sensor sees you again within the > >>>>45 minutes; nothing happens. > > >>>>Only after the timer counts down will that room sensor reset the > >>>>timer.. > > >>>>However, If you, or another person goes into another room and its > >>>>sensor detects movement withing the 45 minute countdown, the timer/ > >>>>controller resets to 45 minutes. > > >>>>Is this clear? > > >>>Perhaps I made it too complicated. > > >>>All sensor signals will set the timer to 45 minutes. > > >>>IOW After the last sensor detects motion and signals the timer, it > >>>will count down 45 minutes. > > >>>That would make it much simpler. > > >>So, any sensed activity first resets the counter to 0, > >>then starts it. When the counter starts, a 5 amp 110 VAC > >>circuit is completed. The counter runs for 45 minutes. > >>If and when 45 minutes is reached on the counter, the > >>5 amp 110 VAC circuit is opened. You've just described > >>a motion sensor switch with a delayed off. They are > >>commercially available. > > >>Here's a link to one:http://www.x10.com/products/x10_ms16a.htm > > >>There are many other manufacturers that make motion sensing, > >>delayed off switches that are used to turn the lights on in > >>a room when there is activity, then turn them off x amount > >>of time after the activity stops. Google to check out what's > >>available. > > >>Ed > > > Thanks Ed, > > > Good find. > > > A few questions: > > > Can all sensors control the same 110 VAC device? > > Yes. But there is a limited range of 20' according > to the info at the url cited above. > > > > > The motion detectors are AAA powered do you know of any hard wired > > devices? > > Yes, there are hard wired motion sensor switches. I've walked > into rooms where the lights turn on upon entry - a bit startling > the first time that happened - and turn off some time after I've > left. Google to find the specs - I don't know what's available > in terms of delay off times, area coverage, etc. > > Ed > > > > > (I can't imagine them hooked to Wally-Mart chargers) > > > Thanks again. The auto room light is fine for that room. The ghoal to is to have all the detectors in all the rooms control a single appliance elsewhere in the house. I believe that the X10 system with an appliance receiver will do the job. Many thanks |