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| DIY timers http://byap.backyardmagazines.com/forum/viewtopic.php?f=8&t=568 |
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| Author: | Nova [ Sep 20th, '06, 16:37 ] |
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Jaycar have an electronic timer switch for about $30 (can switch 10A). Not sure how it copes with 15min on/15 min off though. Nova |
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| Author: | steve [ Sep 20th, '06, 16:39 ] |
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got a link nova? |
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| Author: | veggie boy [ Sep 20th, '06, 17:16 ] |
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Arlec have a digital timer that is avaiable at Kmart. Problem is it only has 10 on/off programs - not enough for what I need to do. I expect the one available at ageofaquariums would be the same. When I get the time I will start playing around with autosyphons, though would not use on unless I was sure it was going to operate all the time. |
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| Author: | steve [ Sep 20th, '06, 18:02 ] |
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If people were confident in a little soldering its actually quite an easy circuit to make a variable on / off cycle timer, but i'd hate it if anyone got electrocuted................ Correct me if i'm wrong, but in our flood and drain setups we don't really care for a 24 hour clock, we just want an ON period of X minutes and and OFF period of X minutes, repeated for ever. Yes? less than 10 components |
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| Author: | Daniel [ Sep 20th, '06, 18:03 ] |
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Jaycar, as in Jaycar electronics in the city? Do they have a website, or just a store? |
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| Author: | steve [ Sep 20th, '06, 18:06 ] |
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www.jaycar.com.au they ave multiple stores in multiple states Actually i think they have a kit based around the 555 timer chip (which is what i was thinking with the last post) Now that would be a safer option for people to dabble in. |
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| Author: | steve [ Sep 20th, '06, 18:07 ] |
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This is the one i was talking about, i think............ VB, ill move these posts to a new section very soon |
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| Author: | steve [ Sep 20th, '06, 18:09 ] |
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This is a better one........... http://www.jaycar.com.au/productView.as ... &SUBCATID= and i have the book with the kit description and build instructions. I can "make these available" to people...................... |
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| Author: | veggie boy [ Sep 20th, '06, 19:20 ] |
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Quote: Correct me if i'm wrong, but in our flood and drain setups we don't really care for a 24 hour clock, we just want an ON period of X minutes and and OFF period of X minutes, repeated for ever. Yes?
Spot on Steve. Ability for the on and off times to be different, but that is basically it. Also, woudl want to be able to adjust if changes to the system change the cycle times. At present, if I was able to, I'd have my timer running 15 mins on and 30 mins off. |
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| Author: | steve [ Sep 20th, '06, 19:24 ] |
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that second link kit would do it easily. i'm fairly sure its based around a micro processor, so will have to dig up the book to see if the periods can be extended. If its based on a 555 timer chip (don't think so) then this is no problem |
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| Author: | simmo_77 [ Sep 20th, '06, 20:11 ] |
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Nice link Steve... I've already got the arlec digital one but it is a real pain to program, and if it starts giving me greif I will have a crack at that. VB, that's hilarious, I haven't had a go at growing anything illicit, just yet anyways  , but I find myself elaborating on WHY I am buying stuff whenever I go to hydroponics shops. They must hear lots of "cover stories" every day of the week....
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| Author: | bundaberg kid [ Sep 20th, '06, 20:31 ] |
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steve wrote: that second link kit would do it easily. i'm fairly sure its based around a micro processor, so will have to dig up the book to see if the periods can be extended. If its based on a 555 timer chip (don't think so) then this is no problem
Ya sure this one would do the trick?....... wouldnt it be positive/negative edge triggered (ie thermo fans/windows staying active after the ignition is TURNED off, this being the trigger to set the on delay/ off delay functions of this particular timer) making it dependant on some sort of input to turn it on |
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| Author: | steve [ Sep 20th, '06, 21:22 ] |
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You are correct for the first mode, which is monostable (oneshot) the second mode is astable (multivibrator) KEEP IT CLEAN AM Will try and dig up the book tomorrow
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| Author: | creative1 [ Sep 20th, '06, 22:07 ] |
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Those digital timers are crap when the power goes off. |
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| Author: | steve [ Sep 21st, '06, 05:44 ] |
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 ?? C1, um when the power goes out the timers have nothing to to time anyway...................and the commercial ones have battery backup for the date/time, the DIY one is simple based on a repetative time base so it doesn't matter. 
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