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OfflineImperius
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Registered: 12/23/15
Posts: 88
Last seen: 6 years, 4 months
Digital timers...
    #23730359 - 10/12/16 07:16 AM (7 years, 3 months ago)

Most cheapo digital timers have up to 20 on/off settings.

I've never owned one so I can't determine whether that is enough "programmability" or not for an ultrasonic in a martha-type GH.

I'm predicting it will need to be on for about 15min per hour. Sooooo....

On/off cycles:

Monday:

1.
ON  - 6:00 - 6:15 (24 hour cycle start)
OFF - 6:15 - 7:00

2.
ON  - 7:00 - 7:15
OFF - 7:15 - 8:00

...

24.
ON  - 5:00 - 5:15
OFF - 5:15 - 6:00 (24 hour cycle complete)

Et cetera, you need 24 cycles for monday alone, let alone all the other days in the week. Am I correct in thinking that one needs a 7x24 (168) setting timer for this? Or am I misinterpreting how on/off cycles are counted?

Thanks


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Offlinedrake89
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Re: Digital timers... [Re: Imperius]
    #23730576 - 10/12/16 09:05 AM (7 years, 3 months ago)

google recycling timers, grasshopper.  there's models starting around $40-60 on ebay.  for $150-200 you can get yourself a nice little greenhouse/hydroponics controller.


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Invisiblesolarity
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Re: Digital timers... [Re: drake89]
    #23730879 - 10/12/16 11:02 AM (7 years, 3 months ago)

I bought something like this for a different application that runs 1min every 30mins. Been working great for over a year, in fact it controls a 3ph 100A relay so lots of electrical noise. Less than $5. In fact a box for it cost more!

Edit sorry wrong item This one


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Edited by solarity (10/12/16 11:36 AM)


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Offlinedrake89
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Re: Digital timers... [Re: solarity]
    #23730922 - 10/12/16 11:16 AM (7 years, 3 months ago)



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Offlinekatbusa
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Re: Digital timers... [Re: drake89]
    #23730971 - 10/12/16 11:34 AM (7 years, 3 months ago)

If your looking for a cycle timer that will last. I use this one
Titan Controlls

If you are looking for one thay will turn on when the temp hits a certain point look into greenhouse fan controllers like this one:

Fan controller

You can also do the same thing with a greenhouse humidity controller. However they can get pricey.


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OfflineImperius
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Registered: 12/23/15
Posts: 88
Last seen: 6 years, 4 months
Re: Digital timers... [Re: katbusa]
    #23733143 - 10/13/16 04:44 AM (7 years, 3 months ago)

Thanks for the advice.

But it appears I was mistaken. The store guy said those 20 settings are limited to a period of 24 hours.

I thought it was weekly, so if I used up all 20 settings for monday, I'd have none left for tuesday, for example. But he assures me that I can program up to 20 for each day. Which means that such a device is quite sufficient for this type of job, no (yet far from ideal, of course)?

Those cycle timers y'all recommended are a wee bit more expensive. They probably last longer and are more accurate, and compared to analog timers, allow for shorter intervals.


Edited by Imperius (10/13/16 05:36 AM)


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Offlineshroombasa
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Registered: 05/02/15
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Re: Digital timers... [Re: Imperius]
    #23733747 - 10/13/16 11:03 AM (7 years, 3 months ago)

45 minutes off at a time is an eternity for high FAE species.  A cheap 15-minute interval, analog rotary timer would be better IMO.


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Offlinechristopherandrews
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Registered: 06/25/20
Posts: 1
Last seen: 3 years, 7 months
Re: Digital timers... [Re: solarity]
    #26781251 - 06/25/20 06:20 AM (3 years, 7 months ago)

Quote:

solarity said:
I bought something like this for a different application that runs 1min every 30mins. Been working great for over a year, in fact it controls a 3ph 100A relay so lots of electrical noise. Less than $5. In fact a box for it cost more!

Edit sorry wrong item This one






thanks for the recommendation.


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