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InvisibleJavadog
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Timer thread
    #14308401 - 04/17/11 07:32 PM (12 years, 10 months ago)

Hello,

I find that I am needing a much better timer than any
that I have found so far if I am going to succeed in
dialing in my GH.

The search engine is not as useful here, as I need data
on devices available for purchase now.

I need Make and model.  URLs to sellers would be a big plus.

This is something that the entire community can benefit from.

I can recommend this timer from Home Depot for certain uses:

http://www.homedepot.com/h_d1/N-5yc1v/R-100685854/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053

It has the little mechanical swiches, 48 of them, and allows
any number of on/offs, but no period less than 1/2 hour.

These timers are dirt cheap, and they work.  They are
perfect for controlling the 12/24 schedule of lights.

I know that this has been asked before, and by me as well,
but I am hoping for more specific data.

It has been recommended that I build what I need from
parts.  This sort of response will do the community good
if sufficiently detailed plans are included.

In any case, thank you for the kind attention.

Take care,

JD

P.S. If this plays out as I hope, then growers will be
able to post back with those units they have found, and
this way this thread will represent a picture of what
models are still currently available, as we go along.


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OfflineRogerRabbitM
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Re: Timer thread [Re: Javadog]
    #14308715 - 04/17/11 08:36 PM (12 years, 10 months ago)

What you're looking for is a cycle timer.
RR


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InvisibleJavadog
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Re: Timer thread [Re: RogerRabbit]
    #14309079 - 04/17/11 09:27 PM (12 years, 10 months ago)

You know RR, I just may have to land on one of those,
in spite of the price.  If it does what I need, then it
will have been worth it.

What I really need is not a timer that defines what
happens over a 24-hour period only.  I need to define
what happens over just one hour, and for this cycle to
repeat each hour.

You see, I got a high quality fogger, and find that I
only need it on for about 5 minutes an hour.  The 30/30
schedule of my Vicks is serious overkill if the fogger
is used as well.

Thank you for taking the time.

JD


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Re: Timer thread [Re: Javadog]
    #14309422 - 04/17/11 10:25 PM (12 years, 10 months ago)

http://shop.reptilegeeks.com/749-mistking-seconds-timer.html

Haven't compared this to the above post, but it's an option. Saw it posted somewhere around here before.

Edited by conformist (04/18/11 07:14 AM)

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InvisibleJavadog
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Re: Timer thread [Re: conformist]
    #14309670 - 04/17/11 11:26 PM (12 years, 10 months ago)

That is a very flexible timer, but it only supports 8 events.

Thank you for sharing!

JD


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Invisiblebiologys
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Re: Timer thread [Re: Javadog]
    #14309792 - 04/17/11 11:54 PM (12 years, 10 months ago)


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Re: Timer thread [Re: Javadog]
    #14309799 - 04/17/11 11:55 PM (12 years, 10 months ago)

yo whats up javadog, just popping in.

I got my cycle timer on ebay.  free shipping :smile:


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Re: Timer thread [Re: dmonkey1]
    #14309802 - 04/17/11 11:56 PM (12 years, 10 months ago)



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InvisibleJavadog
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Re: Timer thread [Re: dmonkey1]
    #14309904 - 04/18/11 12:25 AM (12 years, 10 months ago)

Hey DM,

It does look like "cycle timer" is the operative phrase here.

5 mins on then 55 mins off == a cycle that I'd like to try.

Thank you all for sharing!

JD


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OfflinePrimal Call
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Re: Timer thread [Re: Javadog]
    #14310143 - 04/18/11 01:39 AM (12 years, 10 months ago)

just wanted to add that I use the one JD linked in the OP. if you don't need a "cycle timer," that one is fantastic! oh, and it has 2 plugs if that is not clear by the image.

:peace:


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Re: Timer thread [Re: Primal Call]
    #14310243 - 04/18/11 02:17 AM (12 years, 10 months ago)

you can always plug a 6 outlet expander into it :smile:


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InvisibleGzaajhom
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Re: Timer thread [Re: dmonkey1]
    #14310574 - 04/18/11 06:25 AM (12 years, 10 months ago)

I've been wondering, for short cycles (for example, 1 min on 5 min off), couldn't you use a LM555 set astable, connected to a relay and have it when low to turn the relay on, and when high the relay is off? Times could be adjusted using variable resistors. I'm not an expert on this kind of stuff but was wondering if anyone who knows a little more could clarify on this idea. This would only cost about $10 but I must be missing something.


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InvisibleJavadog
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Re: Timer thread [Re: Gzaajhom]
    #14310750 - 04/18/11 07:46 AM (12 years, 10 months ago)

Good data, thank you.

DM: I checked the timer RR suggested and it does suggest
a 15 Amp limit, so there are limits to the number of power bars
that one can attach to it. ;0)

...and I googling up just what a "LM555 set astable" is right now.

Take care,

JD


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Re: Timer thread [Re: Gzaajhom]
    #14310894 - 04/18/11 08:31 AM (12 years, 10 months ago)

Quote:

Gzaajhom said:
I've been wondering, for short cycles (for example, 1 min on 5 min off), couldn't you use a LM555 set astable, connected to a relay and have it when low to turn the relay on, and when high the relay is off? Times could be adjusted using variable resistors. I'm not an expert on this kind of stuff but was wondering if anyone who knows a little more could clarify on this idea. This would only cost about $10 but I must be missing something.




Absolutely.
The tricky and expensive part is the high power relays, then wiring it safely.
The logic is trivial, the chip does the work and it comes with a chart to say which variable resistors to use.

Haven't worked with 555 in years, but I think you'll actually want a 556 dual timer for this particular application.


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Re: Timer thread [Re: Doc_T]
    #14313213 - 04/18/11 04:32 PM (12 years, 10 months ago)

Quote:

    Quote:
    Gzaajhom said:
    I've been wondering, for short cycles (for example, 1 min on 5 min off), couldn't you use a LM555 set astable, connected to a relay and have it when low to turn the relay on, and when high the relay is off? Times could be adjusted using variable resistors. I'm not an expert on this kind of stuff but was wondering if anyone who knows a little more could clarify on this idea. This would only cost about $10 but I must be missing something.



Absolutely.
The tricky and expensive part is the high power relays, then wiring it safely.
The logic is trivial, the chip does the work and it comes with a chart to say which variable resistors to use.

Haven't worked with 555 in years, but I think you'll actually want a 556 dual timer for this particular application





Yeah I think you would want to have two 555 timers (or one 556).  The first one would send a single pulse approximately every 5min that would turn on the second one set to be on for about 1min.  You could have variable resistors to change the Capacitor charge times so you could adjust the duty cycles of each of the timers.  (555 setups are not very accurate due to variations in the external capacitors but for the purpose of turning on a fan/light it would be fine.) 

The mains relay would be hooked up to the output of the second 555 timer and turn on the outlet.  (with a diode for protection and maybe a transistor to source enough current to turn it on...although 555's can put out about 200mA which may be enough to turn on a smaller relay)


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Re: Timer thread [Re: diegotheslinger]
    #14313979 - 04/18/11 09:22 PM (12 years, 10 months ago)

This is really neat stuff guys, but my following of this
would require a pictorial tek of such detail as to amaze.

Fun stuff though, and I will google the idea when I get time.

I am thinking that a cycle timer will have to do.

(expensive! ...but they will work)

Take care,

JD


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Re: Timer thread [Re: diegotheslinger]
    #14314008 - 04/18/11 09:27 PM (12 years, 10 months ago)

For those that want to muck about with this kind of thing, I recommend an arduino, an lcd and a powerswitchtail.

This way you can control up to 10 amps AC with a limitless degree of resolution, all for about the price of one of those repeat cycle timers (and much less soldering).

I have mine tied to a temp/rh sensor, im experimenting with full auto "smart" chambers.




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Re: Timer thread [Re: SuperPuma]
    #14314024 - 04/18/11 09:31 PM (12 years, 10 months ago)

That arduino is more money, but more versatile. There's a million great teks out there, check Instructables.


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InvisibleJavadog
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Re: Timer thread [Re: SuperPuma]
    #14314065 - 04/18/11 09:38 PM (12 years, 10 months ago)

These posts will make this thread useful for the forum.

Thank you!

(now I am sure that an auduino thread and a 555 thread
will be required to detail these things, but it is good
to have them named)

Thank you all,

JD


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Re: Timer thread [Re: RogerRabbit]
    #14314344 - 04/18/11 10:22 PM (12 years, 10 months ago)

Quote:

RogerRabbit said:
What you're looking for is a cycle timer.
RR




I like these ones


found here..slightly less than RR's suggestion and more versatile
cycle timer link

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