Reverse Countdown Timer

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hand
Posts: 1499
Joined: Sun May 17, 2009 8:42 pm

Re: Reverse Countdown Timer

Post by hand »

Apologies if my suggestion has already been considered and discarded, but why isn't a version of this *the* answer?

https://www.mcmaster.com/7672K54/

This is a reverse countdown timer that you turn to define amount of time you want the appliance off (15 mins - 12 hrs).
No custom electronics, just a drop-in replacement for a switch (but takes a 2 gang box).
Only downside for intended application to my mind is potential noise of operation.

I've shown option with "Hold" capability, but there is an alternate without if young adults can't be trusted!


Switch Type Timer
Timing Adjustment Style Knob
With Override With Override
Number of Circuits Controlled 1
Switch Starting Position Off or On
Switching Current @ Voltage 28 A @ 120 V AC/240 V AC
Horsepower @ Switching Voltage 1 hp @ 120 V AC, 1 hp @ 240 V AC
Set Time 15 min.-12 hrs.
For Outlet Box Type 2 Device (2 Gang)
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TomatoTomahto
Posts: 11124
Joined: Mon Apr 11, 2011 1:48 pm

Re: Reverse Countdown Timer

Post by TomatoTomahto »

hand wrote: Wed Oct 14, 2020 12:31 pm Apologies if my suggestion has already been considered and discarded, but why isn't a version of this *the* answer?

https://www.mcmaster.com/7672K54/
I used to have something similar to time a shower fan, and the negative you mentioned about noise would be a concern; ie, they were loud. Since it’s in a media room, that’s a big downside. I expended a lot of effort in soundproofing the room and installing acoustic panels; I wouldn’t want a ticking windup timer to intrude. I know; first world . . . :oops:

It’s also pretty pricey at $200.

When electrician and carpenter re-emerge, I will get their input. I think perhaps a motion detector to turn off a smart outlet and then a automation routine to start the outlet at 2AM is the easiest.
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BuddyJet
Posts: 609
Joined: Mon Jun 24, 2019 8:56 pm

Re: Reverse Countdown Timer

Post by BuddyJet »

TomatoTomahto wrote: Wed Oct 14, 2020 12:56 pm
hand wrote: Wed Oct 14, 2020 12:31 pm Apologies if my suggestion has already been considered and discarded, but why isn't a version of this *the* answer?

https://www.mcmaster.com/7672K54/
I used to have something similar to time a shower fan, and the negative you mentioned about noise would be a concern; ie, they were loud. Since it’s in a media room, that’s a big downside. I expended a lot of effort in soundproofing the room and installing acoustic panels; I wouldn’t want a ticking windup timer to intrude. I know; first world . . . :oops:

It’s also pretty pricey at $200.

When electrician and carpenter re-emerge, I will get their input. I think perhaps a motion detector to turn off a smart outlet and then a automation routine to start the outlet at 2AM is the easiest.
With timer ticking being an issue, my Intermatic SPDT suggestion would probably not be ideal.

If a fixed 2am restart time is ok, the simple solution is to use a timer like the intermatic st01 timer and program it with a single 2am on time and no off time. Simple touch to front of timer will turn off/on and will turn on a 2 if left off.

I use this setup to turn off a room’s lights if I forget.
People say nothing is impossible. I do nothing all day.
inbox788
Posts: 7597
Joined: Thu Mar 15, 2012 5:24 pm

Re: Reverse Countdown Timer

Post by inbox788 »

OP, have you found a solution?

Below was an idea for using a Lutron MS-OPS6M2 MANUAL OFF OVERRIDE mode. Something you might use in a conference room, but need the lights off for a presentation. https://www.amazon.com/Lutron-MS-OPS6M2 ... B00DZJFN1Y

Got me thinking. A photocell https://www.amazon.com/DEWENWILS-Weathe ... B07KT4R79N for outdoor lighting keeps the lights on all night long and turns off at dawn. You just got to put it in a shoebox and shine a flashlight to recreate dawn to turn off the light (dehumidifier). You could plug the light and the photocell into a power strip, and control the light remotely. I'm surprised I couldn't easily find a light switched controlled timer smart switch kit (that wasn't part of a more complicated Alexa wifi type system). Anyway, the photocell inverts your problem, so it should be easier to find a timer light suppression solution. It would be fairly inexpensive and small to build such a device if there was a market for it. For the most part, just slap an LED next to the photocell or go with a relay.

https://www.homedepot.com/p/Woods-15-Am ... /203638980
https://www.homedepot.com/p/Westek-300- ... /100644817
https://www.homedepot.com/p/Intermatic- ... /310486264

Code: Select all

Was doing something else and came across this device.

Lutron MS-OPS6M2-DV-WH OCCUPANCY SENSOR SWITCH, White
https://www.amazon.com/Lutron-MS-OPS6M2-DV-WH-Multi-Dual-Electrical-Distribution/dp/B00DZJFN1Y
https://www.lutron.com/TechnicalDocumentLibrary/369488.pdf

https://www.amazon.com/TOPGREENER-Infrared-Detector-Required-Occupancy/dp/B082XKTNLW/

I realize the motion detection is reverse of what you want to do, but what was interesting was the low light detection. 

[quote]Auto-ON Options
(MS-OPS and UMS-OPS only)
• Occupancy (default): Auto-ON / Auto-OFF
• Vacancy*: Manual-ON / Auto-OFF
• [b]Low Light: Lights turn on only if needed (if ambient
light is below threshold)
[/b][/quote]

I think there is a mode that can accomplish what you desire, but there are a few limitations. First off, the max power is 3 or 6 amps. Next, the timeout is only up to 30 minutes, though motion might extend the manual off (If you've had the lights at the office turn off and you have to jump up and down and wave your hands to turn them back on, you know what I'm talking about). It's not totally clear if it needs a motion or other trigger to turn on in low light or it's like the outdoor photocell lights. Also, grace period safety algorithm might be kooky for the dehumidifier oddly switched on/off for short periods, but if that's not harmful, and no one is there to hear it, it's like a tree falling.
[quote]Manual Off-While-Occupied Options
(MS-OPS and UMS-OPS only—see Additional Features on page 5 for default setting)
• Enabled
– When the occupancy sensor switch is manually turned off, the occupancy sensor switch will not turn the lights back on automatically while the
room is occupied.
– [b]Once the room is vacated, the Auto-ON feature returns to normal operation after the timeout period has expired.
[/b]– This may be the preference in conference rooms or classrooms while viewing presentations. This feature requires motion to keep the lights off.[/quote]
If more power is needed, there may be other light sensing with manual override motion light switches or other switches. Key is light sensing and manual override. The motion is mostly unused (but you do need it to reset the manual override). I searched very briefly, but didn't come up with one, but I'm guessing it's out there.

If you find some ambient light sensor switch that works, you could always cover the sensor so it's always dark.
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