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Post by z on Jul 9, 2009 23:29:53 GMT -5
Hi everyone. How far have you guys every automated a terrarium? I'm planning on automating everything except the occasional watering, and I'm looking for some suggestions.
My current plan is to use a microcontroller plus some sensors to control things like lights, humidifiers, fans, etc. I also have a plan drawn out with pumps and a reservoir that makes it so that I don't have to water my plants or refill my fogger. All I have to do is refill the reservoir every once in a while.
I am currently programming the software, which is quite easy. The hard part is getting the microcontroller to control big things like power outlets. Is there an electrician out there that is experienced with this and can direct me to the correct relay switch for the job? (preferably one that I can order online or find at a hobby shop) Thanks!
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Post by briar on Jul 9, 2009 23:40:16 GMT -5
A PLC (programmable logic controller) is the easiest method, they are the standard for process control in industry.
There are some very inexpensive models now... but you will need the dedicated software for programming
Most use simple ladder logic. On this side of the pond Allan Bradley is the standard (expensive) on the other side of the pond it's Siemen's
With no more inputs and outputs then you need even an older AB SLC100 would do the trick
If you are looking for a relay card for a computer then try electronickits.com
HTH's Butch
edit: fix typo in url
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Post by z on Jul 10, 2009 0:01:44 GMT -5
Hmm, the relay card sounds interesting. I did a quick search, and if I am imagining it correctly, then it could be what I am looking for. I will do a quick search at my local electronics shop tomorrow for what you suggested. Thanks for the help .
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Post by briar on Jul 10, 2009 10:32:56 GMT -5
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Post by lloyd on Jul 10, 2009 11:43:27 GMT -5
I do all that myself from "scratch". There are very inexpensive "solid-state" relays which are really easy to use. 5V logic signals can control 110VAC. They are very well insulated-no shock hazard to low voltage side if connected properly.
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Post by z on Jul 10, 2009 15:43:29 GMT -5
I went to my local electronics store today and had a look around. Turns out that these solid-state relays are exactly what I am looking for.
I didn't pick any up though, they were pretty expensive (like $10 each) so I'm going to plan everything out and do some calculations before I buy any.
Thanks guys!
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Post by lloyd on Jul 10, 2009 22:17:05 GMT -5
$10 each seems a bit pricey. Check Supremelectronics on College St. Toronto.
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Post by z on Jul 12, 2009 0:57:59 GMT -5
I live on College, but I cannot seem to find that store. What major intersection is it on?
I usually go to Creatron for electronic components.
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Post by lloyd on Jul 12, 2009 8:14:40 GMT -5
Creatron is good but I go there last or just to browse (only place for SMT). For instance I saw a USB scope at Creatron and bought a better one for much less direct from China. First I go to: www.honson.com/ (used to be Supremelectronics-great store near you) www.activesurplus.com/ (also a great place-I pick up lots of lab & electronic stuff there.) Above All Surplus (often good for odds and ends if you're around) Surplus Electronics 602 Bloor Street W. 416-588-8119 Also if you have to take the TTC it's often cheaper to order from Futurlec online (Thailand). Here's their solid state relays (reasonable price). www.futurlec.com/RelSS.shtml
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Post by z on Jul 12, 2009 21:40:10 GMT -5
I will check out honson the next time I go shopping for parts, although I am still in the planning stages. First, I need to see if my cooling system can cool down the tank to 10 degrees C.
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