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gray

Registered: 03/07/15
Posts: 127
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Re: Raspberry Pi Controlled Mini Greenhouse [Re: 36fuckin5]
#21846318 - 06/23/15 02:49 PM (8 years, 7 months ago) |
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Quote:
36fuckin5 said: You don't want your RH that high all the time. Dropping to 70-80% once in a while is a good thing, as it lets evaporation happen, which starts pinning.
Thanks. I'll add a humidity schedule so it's possible to specify humidity cycles, x minutes at y humidity, z minutes at t humidity, etc.
Edited by gray (06/23/15 03:28 PM)
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gray

Registered: 03/07/15
Posts: 127
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Re: Raspberry Pi Controlled Mini Greenhouse [Re: MycoRunner]
#21847023 - 06/23/15 06:12 PM (8 years, 7 months ago) |
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Quote:
MycoRunner said: I've been thinking about using my Pi for automation too, but until now I was too intimidated to try it. Can the raspberry pi switch the relay by itself from the GPIO? And what is the circuit on the relay's input? Nice work!
No, at least not that particular relay. The GPIO output is 3.3V and that relay needs at least 4V to switch it. That is what that little circuit is, it's allowing a 3.3V output to switch a 5V line (off the PI) which in turn switches the relay. I'll post the details as soon as I get chance.
If you had a relay which was switchable via 3.3V that little circuit wouldn't be required.
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Srirachi
Mold Hand



Registered: 10/18/05
Posts: 11,411
Loc: Fare Thee Well.
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Re: Raspberry Pi Controlled Mini Greenhouse [Re: gray]
#21847577 - 06/23/15 08:16 PM (8 years, 7 months ago) |
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eatyualive
Eat's You Alive :)



Registered: 08/17/01
Posts: 19,026
Loc: In Your Head
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Re: Raspberry Pi Controlled Mini Greenhouse [Re: gray]
#21847588 - 06/23/15 08:19 PM (8 years, 7 months ago) |
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gray

Registered: 03/07/15
Posts: 127
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Re: Raspberry Pi Controlled Mini Greenhouse [Re: Srirachi]
#21848660 - 06/24/15 01:00 AM (8 years, 7 months ago) |
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Quote:
Srirachi said: I rebuilt a timer-based IR heat controller with a PID and SSRs recently and they were 3V "coil" http://www.ebay.com/itm/Solid-State-Relay-Module-SSR-25DA-25A-250V-3-32V-DC-Input-24-380VAC-Output-KN-/321625626679?pt=LH_DefaultDomain_0&hash=item4ae2619837
Ah, nice. I couldn't find cheap 3v solid state here in the UK. Perhaps I didn't look hard enough. :/ Those relays you have would be great for the Pi. Cheap too!
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quetzel
Stranger

Registered: 07/17/16
Posts: 63
Last seen: 6 years, 7 months
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Re: Raspberry Pi Controlled Mini Greenhouse [Re: gray]
#23630783 - 09/09/16 09:57 PM (7 years, 4 months ago) |
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Did something similar with a raspberry. Unfortunately both my cheap ebay AM temperature/humidity sensors seemed to be shit and give temp but no humidity. I think they are defective. Their reputation doesn't seem to be very good. High humidity probably kills them fast too.
As an alternative I just brute force it with some crontabs. Run 400cfm fan every hour to douche chamber. Run humidifier and circulating fan afterwards and then twice more in an hour to keep humidity up. Fiddle with times, fiddle with humidifier settings.
Haven't killed the oysters yet.
Is your humidity sensor still working? Have you had to replace it? I'm starting to think that humidity is voodoo anyway and any measurement above 70% is suspect unless you paid $100 for the sensor.
I have light, circulating fan, venting fan, and humidifier all controlled by sainsmart 4 port relay. Wiring was pretty straight forward.
I have a circulating fan in the chamber, I run it when I'm venting and when I'm humidifying in the hope of stirring things up. Was running it all the time but bad things happened.


Bought the same 20A relay. Will use it for the heater when winter gets here. Also need one for the pasteurizer when I figure out how to make the steam generator.
On the raspberry pi scale of difficulty I rate this about a 2. Slightly harder than trivial. I'm just happy that I didn't have to do it with an arduino because I would still be working on it. As an added bonus I can play music with the pi while I'm working on the chamber .
Downside... I probably need to buy two of everything because if something blows up I'm fucked.
I expect to be eating oysters in a week. Once I'm sure I haven't created an oyster death machine I will pack the fucker with 240 pounds of straw and see what happens.
I have bigger hopes for the raspberry pi pasteurizer. It will measure temps of the substrate and steam chamber and eliminate all guesswork. Log in with the cell phone, start the cycle and go have a beer. Nothing left to do until it cools and gets unloaded.
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