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 Arp
roving mycophagist
Registered: 04/20/98
Posts: 2,133
Loc: in a van by the river
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 Re: Quest for a fully automatized climate [Re: Erik006]
#8030568 - 02/16/08 09:30 AM (9 months, 13 days ago) |
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phew thanks for the info. won't be trying then
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 poke smot!
cognitive consonance
Registered: 01/08/03
Posts: 4,292
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Re: Quest for a fully automatized climate [Re: Erik006]
#8030934 - 02/16/08 11:39 AM (9 months, 13 days ago) |
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Thanks for your input Erik. I'm still going to work on this sensor since it has applications in horticulture where it would not be subjected to abnormally high humidity.
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cosmoline
expertcontaminationgrower
Registered: 08/11/07
Posts: 170
Last seen: 4 days, 19 hours
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Re: Quest for a fully automatized climate [Re: poke smot!]
#8035618 - 02/17/08 09:39 PM (9 months, 12 days ago) |
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For a cheap, accurate temperature/RH sensor sensirion's SHT11 looks like the way to go. I finally got my sample months after I submitted it. The only problem with this sensor is that is has SMD connections which you really need to have a circuit board to mount it on. I'm going to make a HCL/h202 bath and print some simple ones out. If any of you are also working with this same sensor PM me with interest and I will print out a big batch.
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Buy the ticket, take the ride.
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poke smot!
cognitive consonance
Registered: 01/08/03
Posts: 4,292
Last seen: 3 days, 16 hours
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Re: Quest for a fully automatized climate [Re: cosmoline]
#8036891 - 02/18/08 07:42 AM (9 months, 12 days ago) |
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cosmoline, there are SHT71's which have leads and do not require any smt stuff.
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joesmithjoe
Stranger
Registered: 01/27/05
Posts: 59
Last seen: 4 months, 16 days
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Re: Quest for a fully automatized climate [Re: poke smot!]
#8052081 - 02/21/08 02:12 PM (9 months, 8 days ago) |
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I am really interested in this. I am planing on trying my had at designing a tec. that makes it almost as easy to grow pan as it is to grow cubs. The hardest part is getting the humidity right during fruiting imo so a project like this would cure that problem.
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Be Part of The New Pan Movement!!!
http://www.shroomery.org/forums/showflat.php/Cat/0/Number/7559934/page/0/fpart/1/vc/1
cubies are for kiddies, grow pans!
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cosmoline
expertcontaminationgrower
Registered: 08/11/07
Posts: 170
Last seen: 4 days, 19 hours
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Re: Quest for a fully automatized climate [Re: poke smot!]
#8052232 - 02/21/08 02:56 PM (9 months, 8 days ago) |
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Quote:
poke smot! said:
cosmoline, there are SHT71's which have leads and do not require any smt stuff.
they have leads but are only accurate to 80% rH.
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Buy the ticket, take the ride.
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poke smot!
cognitive consonance
Registered: 01/08/03
Posts: 4,292
Last seen: 3 days, 16 hours
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Re: Quest for a fully automatized climate [Re: cosmoline]
#8052617 - 02/21/08 04:32 PM (9 months, 8 days ago) |
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That is what the data sheet says. They do read up to 99%. With the internal condensation heater it seems these are very close to readings that were obtained using a small digital hygrometer similar to the ones people are using in their terrariums already.
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cosmoline
expertcontaminationgrower
Registered: 08/11/07
Posts: 170
Last seen: 4 days, 19 hours
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Re: Quest for a fully automatized climate [Re: poke smot!]
#8055046 - 02/22/08 01:47 AM (9 months, 8 days ago) |
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Quote:
poke smot! said:
That is what the data sheet says. They do read up to 99%. With the internal condensation heater it seems these are very close to readings that were obtained using a small digital hygrometer similar to the ones people are using in their terrariums already.
Those hydrometers don't use digital humidity sensors, its all analog. If you want real accuracy you gota go digital. I'm gona stick with the sht11 or even better sht10. I already have circuit board layouts and will have them printed this weekend. The best part of using these is that the sht10 is only like 10$ from china and is accurate to 100%. This project is coming along well for me, expect to see good things from me in the future.
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Buy the ticket, take the ride.
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LoWgRoW
Strange
Registered: 09/22/07
Posts: 251
Loc: NYCHITY
Last seen: 3 months, 3 days
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Re: Quest for a fully automatized climate [Re: cosmoline]
#8055468 - 02/22/08 08:22 AM (9 months, 8 days ago) |
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again great work! I can't wait to see how it in action.
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Beauty in things exists in the mind which contemplates them.
Your fortune for today...
Avoid negative people.
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poke smot!
cognitive consonance
Registered: 01/08/03
Posts: 4,292
Last seen: 3 days, 16 hours
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Re: Quest for a fully automatized climate [Re: LoWgRoW]
#8055947 - 02/22/08 10:54 AM (9 months, 7 days ago) |
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If you would like to see something in action check out the automation section of the mushroom growing FAQ. There's some links there to some old threads where I built & tested this sort of thing with marthas, with good results.
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ShibariSmurf
Stranger
Registered: 06/04/07
Posts: 1
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Re: Quest for a fully automatized climate [Re: cosmoline]
#8201492 - 03/27/08 01:07 PM (8 months, 4 days ago) |
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I'm in the final stages of putting together the arduino SHT71 system. My test show that the 71 is accurate within 2% when RH is over 90% (ie. if RH=90% than it reads 88% or 92%) this is within what I'm looking for so it works just fine and is better than the data sheet indicates.
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poke smot!
cognitive consonance
Registered: 01/08/03
Posts: 4,292
Last seen: 3 days, 16 hours
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Re: Quest for a fully automatized climate [Re: ShibariSmurf]
#8202215 - 03/27/08 04:47 PM (8 months, 4 days ago) |
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Be sure you use the internal heater at regular intervals to evaporate condensation! That's what it's there for 
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theratatat
Hobbyist
Registered: 03/09/07
Posts: 204
Last seen: 29 days, 12 hours
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Re: Quest for a fully automatized climate [Re: poke smot!]
#8271706 - 04/11/08 09:48 PM (7 months, 20 days ago) |
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I just thought I would add my two cents to this one, even though its late in the game.
I am actually using the SHT11 for controlling humidity with an ultrasonic transducer. I have attached a screenshot of the web interface I built for it.
As you can see I am able to keep my humidity fairly even with this sensor. I am really happy with this sensor, except for a I had one crap out on me really early and had to send for a new one.
I have indeed wrapped my sensor in tyvek and have had really good luck since then. It doesn't really hurt the response time much.
Cheers
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