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Bobbit
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Doh, Martha Mist-akes
#25750662 - 01/18/19 04:10 AM (6 years, 14 hours ago) |
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Okay, so I decided to build a Martha.
I have as much 2x4 as I need and 'found' some sticky stretchy plastic (600mm wide) and am going to frame up a room, cover each frame in sticky plastic, then assemble. I found some wire shelves cheap locally, too easy . . .
Room is easy, then comes the issues.
I bought an evaporative cooler, which seems way to big (12L capacity) and the low setting seems kinda high.
I also bought an ultrasonic humidifier (5L capacity)
My problem is controlling these devices. Both of them have no timers on them. When they are turned off and back on, they reset to the off position, so I can't control them by a plug timer.
If I leave the humidifier on all the time, too much wet. If I leave the fan on all the time too much dry.
What if I leave a decent exit vent and have both running all the time? This is intended to be outside . . .
Any thoughts to help out a noob...
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bodhisatta 
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25750703 - 01/18/19 05:14 AM (6 years, 13 hours ago) |
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Sounds like you need a cheaper humidifier that doesn't have the digital crap so you can use it with a timer then
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SumFunGi
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25751141 - 01/18/19 10:42 AM (6 years, 8 hours ago) |
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Get a digital timer for your fan that you can set to whatever you want... and get a humidistat for your humidifier. And put the humidifier outside of the tent and pump over humidity through 1/2” PVC. Highly recommend making the hold in the tent in the top, and towards the back as far as it will go. Reason for this is it will drip a bit of water.... and having it I. The center ( like me, makes the center part of the tent not usable as I don’t want drips of water upping my co tam chances.
I also put a Harvey duty plastic bag on the bottom, elevated the tent with bricks about 6 inches and put a hole through the trash bag so that water does not pool.
Dial it in, it will work better... but so far, my Martha is not nearly as good as a tub. But it does ok with cakes. My journal has my setup I think if you want to look at that.
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SumFunGi
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25751148 - 01/18/19 10:44 AM (6 years, 8 hours ago) |
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Ultrasonic cool mist humidifier. It’s not digital. Has a knob so will work with a timer or humidistat.
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bodhisatta 
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Re: Doh, Martha Mist-akes [Re: SumFunGi]
#25751216 - 01/18/19 11:14 AM (6 years, 7 hours ago) |
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He said it resets to off position when it is given power for the first time. That means its has some sort of digital control. Hence the timer not working for him. Even a digital one wouldn't solve his problem
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Bobbit
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Re: Doh, Martha Mist-akes [Re: bodhisatta]
#25751317 - 01/18/19 12:13 PM (6 years, 6 hours ago) |
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Quote:
bodhisatta said: He said it resets to off position when it is given power for the first time. That means its has some sort of digital control. Hence the timer not working for him. Even a digital one wouldn't solve his problem
Thanks for your reading skills 
Will have to rethink the humidifier. Fun justifying to the wif. Seems like 15mins every 1-2 hours is where peeps end up.
Is there a problem with a constant breeze inside the tent?
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SumFunGi
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25751597 - 01/18/19 02:28 PM (6 years, 4 hours ago) |
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Sorry! I obviously mis-read that. Try returning it for a refund. That should appease wifey.
I like the idea of a constant breeze and may turn mine on for a few days to see how it goes. I have my cakes in a tub with 3 inches of soaked verm... they are “floating” on foil boats. And that tub is in my Martha... I had cakes just in the tent, and they would not fruit... and surprisingly enough, even with 95% RH, still were dried out.. they would pin, but were very pale, and the cake was just dry. Even with misting etc.. I’m gonna try the fan on all the time and see what happens. FAE is the biggest issue in a Martha, in my opinion. The fan may help that.
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Bobbit
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Re: Doh, Martha Mist-akes [Re: SumFunGi]
#25751833 - 01/18/19 04:16 PM (6 years, 2 hours ago) |
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NP! Will try with what I have. Will use perlite/pumice in trays also. Had the idea of having larger pieces on the bottom in 1/2 inch of water also. I could control times initially with the amount of water in the unit.
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Asura
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25752232 - 01/18/19 06:53 PM (6 years, 16 minutes ago) |
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Asura]
#25756897 - 01/20/19 06:13 PM (5 years, 11 months ago) |
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What about this as a contender.
Suggest can control ANY humidifier, though not the one I have . . .
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puff4200
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25756925 - 01/20/19 06:24 PM (5 years, 11 months ago) |
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If you want your controller to be very accurate you should look up hm1500 sensor. The sensor that comes with the inkbirds and whatnot is ok for a bit but its not accurate for long. Just cut the sensor it comes with off, connect the correct wires and your good to go.
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gizmodo
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Re: Doh, Martha Mist-akes [Re: Asura]
#25757103 - 01/20/19 07:37 PM (5 years, 11 months ago) |
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Quote:
Asura said: Turning stuff on and off based on arbitrary time frames is going to be tough. You need a humidity controller.
https://smile.amazon.com/WILLHI-Plug-n-play-Controller-Humidifier-Dehumidifier/dp/B076LMFRHG/ref=sr_1_3?ie=UTF8&qid=1547862732&sr=8-3&keywords=willhi+humidity+controller
Just picked up an inkbird before my first gourmet fruit in a greenhouse set up. Can say that I am completely satisfied knowing its going to be monitored and not just timed.
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Asura
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Re: Doh, Martha Mist-akes [Re: gizmodo]
#25757127 - 01/20/19 07:45 PM (5 years, 11 months ago) |
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Asura]
#25757505 - 01/20/19 10:04 PM (5 years, 11 months ago) |
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Now the problem seems to be to find a humidifier that can be 'controlled'.
All of the commercial units I can find here are too 'clever' to be controlled by turning the power on and off.
I see foggers and floats on amazon, though I'd have to find a local power supply, which shouldn't be too hard.
Does the inkbird allow logging over time?
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gizmodo
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25757542 - 01/20/19 10:25 PM (5 years, 11 months ago) |
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Ultrasonic humidifiers should work. I'm unsure if it allows logging of information anywhere but if it did it would say in the amazon detail of the product. It's pretty informative.
--------------------
One must be mindful to maintain their balance on the slippery earth.
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Edited by gizmodo (01/20/19 10:39 PM)
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Bobbit
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Re: Doh, Martha Mist-akes [Re: gizmodo]
#25760908 - 01/22/19 01:08 PM (5 years, 11 months ago) |
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So where in the martha does one place their humidity sensor?
Top, middle, bottom, intake, outlet?
Any recommendations?
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SumFunGi
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25760921 - 01/22/19 01:20 PM (5 years, 11 months ago) |
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Mine is on the middle rack towards the back of the tent hanging over the shelf.
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Bobbit
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Re: Doh, Martha Mist-akes [Re: SumFunGi]
#25761371 - 01/22/19 05:08 PM (5 years, 11 months ago) |
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Quote:
SumFunGi said: Mine is on the middle rack towards the back of the tent hanging over the shelf.
Where do you have your fan inlet/outlets and humidifier?
I was thinking inlet to the top with humidifier, and outlet at the bottom. It seems spores and moisture are gravity driven.
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TwonkyD
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25761933 - 01/22/19 09:28 PM (5 years, 11 months ago) |
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Twonky's favorite setup is the "donut" humidifier!
These "donut ultrasonic humidifiers" are available for very cheap, and can be run on very little power. They use USB chargers as a power supply, and if you find a decent USB charger with multiple outputs, can be adjusted in number and amperage/voltage to control maximum output. They have no switching internally, so if they're getting power, they're on. Unless the vessel they are in runs out of water, they won't have water level issues, since they float. Brilliantly simple, cheap and effective!
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Bobbit
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Re: Doh, Martha Mist-akes [Re: TwonkyD]
#25773853 - 01/28/19 03:08 AM (5 years, 11 months ago) |
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Found a humidifier locally that will fit the bill. I have a humidity controller coming too ;-) Will control with timer until controller arrives.
Will be running the evaporative cooler 24/7 and measuring humidity.
Nearly finished Martha structure. 1300mm wide x 650mm deep x 2100mm high with 4 shelves 500mm apart. Double skinned for temperature dampening.
Just need to finish the doors, and duct the air and mist. . .
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25798437 - 02/08/19 12:26 AM (5 years, 11 months ago) |
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So,
I have 2 main options.
I'm ducting air from my fan into the top of my Martha to be on 24/7.
I can pipe my humidifier directly into the top of the chamber or into the duct before it enters the chamber.
I'm thinking that wet air in the duct could end up making a problem.
Any suggestions?
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Bobbit] 1
#25800391 - 02/08/19 10:41 PM (5 years, 11 months ago) |
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 And so it is done!
Went with a separate inlet for fog above the evaporative fan.
Running it now for a day or 7 to see how the humidity sensor works and levels go, and how much water it consumes.
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Asura
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Re: Doh, Martha Mist-akes [Re: Bobbit] 1
#25800404 - 02/08/19 10:54 PM (5 years, 11 months ago) |
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I think you should make a bucket fogger:
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Bobbit
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Re: Doh, Martha Mist-akes [Re: gizmodo]
#25800634 - 02/09/19 03:12 AM (5 years, 11 months ago) |
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Quote:
gizmodo said:
Quote:
Asura said: Turning stuff on and off based on arbitrary time frames is going to be tough. You need a humidity controller.
https://smile.amazon.com/WILLHI-Plug-n-play-Controller-Humidifier-Dehumidifier/dp/B076LMFRHG/ref=sr_1_3?ie=UTF8&qid=1547862732&sr=8-3&keywords=willhi+humidity+controller
Just picked up an inkbird before my first gourmet fruit in a greenhouse set up. Can say that I am completely satisfied knowing its going to be monitored and not just timed.
I'm using an inkbird. This is showing the of 89.9% yet the cigar hygrometer is reading 99%? And they are next to each other?!
Looking to buy a logging hygrometer, though it seems that each reads differently...
My GH is 2 x 4ft, and I'm running 1 disc. Will see what happens over the next few days...
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Asura
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Re: Doh, Martha Mist-akes [Re: Bobbit] 1
#25801086 - 02/09/19 09:30 AM (5 years, 11 months ago) |
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You need to calibrate your inkbird sensor. Wrap it in a wet paper towel then close it up in a grocery bag for 1-2 hours. Whatever the final reading it's your "100%". So mine topped out at 91.5 so I set the CA parameter to +9.5%.
My analog and the Inkbird match perfectly.
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gizmodo
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Re: Doh, Martha Mist-akes [Re: Asura]
#25801285 - 02/09/19 10:39 AM (5 years, 11 months ago) |
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--------------------
One must be mindful to maintain their balance on the slippery earth.
Bod's Comprehensive Agar Resource
Gizmodo's Market Stall
Say No To Grow Kits
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Asura]
#25801654 - 02/09/19 01:09 PM (5 years, 11 months ago) |
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Quote:
Asura said: You need to calibrate your inkbird sensor. Wrap it in a wet paper towel then close it up in a grocery bag for 1-2 hours. Whatever the final reading it's your "100%". So mine topped out at 91.5 so I set the CA parameter to +9.5%.
My analog and the Inkbird match perfectly.
Thanks for the tip.
I set the inkbird at 90 with 5% and it goes up to 90, cuts out, drops to 85, and cuts in, so in theory working. . .
I have a digital cigar hygrometer that reports min/max and have placed it top, middle and bottom, and it's reading 99% for both.
There is a light mist permanently in the room. . .
Will try her suggestion and see what happens... Still a few weeks away from needing, so fingers there is time.
EDIT:it appears that RH reporting is impacted by temperature also. I covered the sensor as suggested and the value stabilised around 93.8%, then gradually lowered as the day progressed and the temperature rose.
Edited by Bobbit (02/09/19 02:25 PM)
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Asura]
#25802241 - 02/09/19 07:13 PM (5 years, 11 months ago) |
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Quote:
Asura said: I think you should make a bucket fogger
Hard to find multihead (or single head) foggers here, and as we are 240v harder to source power supply.
It seems that a single disc humidifier can't keep up during the day time, night time is fine. I have a second single disc (not outlet controllable) that I may leave on during the day, topped up by the controllered one.
Will keep an eye on Amazon for a 5 head, as that should suffice. Will also look at local suppliers of transformers.
That setup looks awesome.
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Teonanautical
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25802606 - 02/09/19 10:26 PM (5 years, 11 months ago) |
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Having gone through a similar build recently I came to the unfortunate conclusion that good humidity sensors that function well at RH >90% do not come cheap. I tried three different kinds and eventually dropped the cash on an expensive industrial one. All the others ones were either wildly inaccurate or crapped out after a short period of time. Maybe you will have more luck but that was my conclusion.
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Teonanautical
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For what it's worth here is my post documenting my build and my experience with humidity probes:
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Bobbit
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Quote:
Teonanautical said: For what it's worth here is my post documenting my build and my experience with humidity probes:
WOW, Mac daddy caddy Martha you built!
Looks like I need more mist for mine as it is outdoor and suffers from temperature fluctuations.
It seems that patience is very important for this hobby.
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Asura
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Quote:
Teonanautical said: For what it's worth here is my post documenting my build and my experience with humidity probes:
Dude, that is seriously impressive. I've gotten a lot of help from Blue Helix on my set up as well.
As for the humidity sensor...if you are using the probes with a Willhi or Inkbird controller you can cover the sensor in RTV where the wires come into the sensor (being careful not get any on the important bits of course).
https://www.shroomery.org/forums/showflat.php/Number/22650843#22650843
My probe has lasted a good solid year in demanding situations and is still going strong.
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bodhisatta 
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Quote:
Teonanautical said: For what it's worth here is my post documenting my build and my experience with humidity probes:
What's the advantages you get from the gizmos. I get these results misting once every 3-4 days. Similar size trays on shelving. My climate is dry as hell usually
 
If I'm doing electricity and computer automatic i want it to do a better job than passive automatic
If i did automatic I would just have misters for every tub and a wifi camera. Check it once a day and hit the mist button if needed. But if you're there every 3-4 days to fill the humidifier who cares just mist em yourself
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Asura
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Re: Doh, Martha Mist-akes [Re: bodhisatta] 1
#25803767 - 02/10/19 01:22 PM (5 years, 11 months ago) |
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Nothing really if you are just growing cubes.
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Asura]
#25804048 - 02/10/19 03:59 PM (5 years, 11 months ago) |
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Well now. . . I'm growing oysters, and have found that the sgfc I was using had far to little fae. So I decided to make something biggerer, with a constant fan.
My fan is probably too much for hand missing twice a day.
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silave
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25804221 - 02/10/19 05:52 PM (5 years, 11 months ago) |
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wow that's dedication right there. too bad I don't have the same craftsmanship to build that haha
-------------------- Looking to cultivate and master legal mushroom! Also interested in microscopic research on psychoactive shroom compounds.
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Teonanautical
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Re: Doh, Martha Mist-akes [Re: Asura]
#25807437 - 02/12/19 08:39 AM (5 years, 10 months ago) |
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Quote:
Asura said:
Quote:
Teonanautical said: For what it's worth here is my post documenting my build and my experience with humidity probes:
As for the humidity sensor...if you are using the probes with a Willhi or Inkbird controller you can cover the sensor in RTV where the wires come into the sensor (being careful not get any on the important bits of course).
https://www.shroomery.org/forums/showflat.php/Number/22650843#22650843
My probe has lasted a good solid year in demanding situations and is still going strong.
Wow really? I found that it started to go wonky after a while, reading way off, especially in the higher RHs. I suppose we all have to go through our own learning curve
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Teonanautical
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Re: Doh, Martha Mist-akes [Re: bodhisatta]
#25807443 - 02/12/19 08:46 AM (5 years, 10 months ago) |
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Quote:
bodhisatta said:
What's the advantages you get from the gizmos. I get these results misting once every 3-4 days. Similar size trays on shelving. My climate is dry as hell usually
The only real reason is for growing pans because they need more fresh air than you can get in a tub.
Also - and maybe this is splitting hairs - but refilling a tank every few days is a lot less work than misting a whole bunch of tubs.
I have a plan to build an auxiliary tank connected to the humidifier to extend the capacity of the tank. I'm thinking maybe one of those 5-gallon camping water jugs. That should extend the life to well over a week.
Edited by Teonanautical (02/12/19 08:53 AM)
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Bobbit
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Have you thought to use a ball-cock and mains water?
I am looking to make similar to the Bucket Fogger in post 2, and have the parts coming from China . . . 
Until then, it look like I will be trying my first monos with P.tampanensis in the interim, and trying pumice trays for additional humidity
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Teonanautical
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25811345 - 02/13/19 10:33 PM (5 years, 10 months ago) |
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Quote:
Bobbit said: Have you thought to use a ball-cock and mains water?
Yeah I've thought about a ballcock system. And then I thought about how I'd probably screw it up and end up flooding the place...
Edited by Teonanautical (02/13/19 10:34 PM)
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Bobbit
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Luckily mine is outside... So as long as the electrickery is above the liquidation, should be gravy.
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Fungiii
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25811566 - 02/14/19 01:55 AM (5 years, 10 months ago) |
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Shrumpy
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Re: Doh, Martha Mist-akes [Re: Fungiii]
#25811579 - 02/14/19 02:05 AM (5 years, 10 months ago) |
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are the cheap ebay humidifiers a waste of time?
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Shrumpy]
#25811634 - 02/14/19 02:44 AM (5 years, 10 months ago) |
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Quote:
Shrumpy said: are the cheap ebay humidifiers a waste of time?
I'm no authority, but the room I built is too big, and the fan too strong for a single disc (ultrasonic).
Smaller room, smaller fan, should be fine.
I'm awaiting 5 discs and a transformer, then the room and fan should work nicely!
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Shrumpy
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25811649 - 02/14/19 03:00 AM (5 years, 10 months ago) |
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Shrumpy] 1
#25879172 - 03/17/19 01:02 AM (5 years, 9 months ago) |
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And today all the bits came together . . . Much tidier . . .

Initial tests are positive. As this is outdoors and the tests were later afternoon, will have to see how it performs through the heat of the day.
Fingers crossed (and spawn spawning)
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Asura]
#25881118 - 03/17/19 11:01 PM (5 years, 9 months ago) |
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Quote:
Asura said: you can cover the sensor in RTV where the wires come into the sensor (being careful not get any on the important bits of course).
I have ascetic cure RTV. Won't this cause the wiring to rust? Will find some neutral cure . . .
Thanks again Asura for your very helpful tips. This would have been much more painful without your suggestions (and less painful had I asked first - though where is the fun in that).
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Asura
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25881130 - 03/17/19 11:08 PM (5 years, 9 months ago) |
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I covered mine in the red stuff....the one for making gaskets.
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Asura]
#25881269 - 03/18/19 01:30 AM (5 years, 9 months ago) |
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Did it smell like vinegar?
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Asura
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25881301 - 03/18/19 02:03 AM (5 years, 9 months ago) |
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Asura]
#25881330 - 03/18/19 03:03 AM (5 years, 9 months ago) |
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Yep, thats acetic cure, i guess its hard to see if there is rust on the inside through that stuff! Then again, it is air tight, so no oxygen to 'oxidize' the metal...
I used some (clear) permatex on some lids I made, using screw bands and seals for some ezLC, with the seals upside down. Unfortunately, these seemed impossible to seal against the glass. I pulled tham appart and found both the ring and seal rusting...
Will find some neutralmcure. Doesn't need to be heat resistant.
On another note, the GH dropped to 88% humidity during the hottest part of the day. I'm pretty sure thst this will only be a problem in the middle of summer, which is 9mths away. Plenty of time to secure more disks, and a bigger fan.
Does anyone have any ideas on number of air replacements per hour? Or is that just a horticulture term?
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25927914 - 04/10/19 11:32 PM (5 years, 9 months ago) |
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So my logging hygrometers arrived partway through my first attempt.
Apparently I'm operating between 95 & 99% RH
Is this the range I should be in? I am seeing differing opinions yet too early for experimentation...
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25931495 - 04/12/19 09:43 PM (5 years, 9 months ago) |
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First trays (ever). P.tamps.

6 days after mixing 2:1 with bucketed cvg.
Should I remove the lids and leave them in full humidity? Is 95-99% too high
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25938925 - 04/16/19 09:16 PM (5 years, 8 months ago) |
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So heating. . .
'Don't do it!' I hear you all say. . .
I'm getting temps dropping to 9°C overnight which will continue to fall.
I think I'll use an aquarium heater. Do I heat my humidibucket water or have a separate water container in the the GH?
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Asura
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25938933 - 04/16/19 09:19 PM (5 years, 8 months ago) |
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I think mary fairchilds uses an aquarium heater in a bucket of water on the bottom shelf of her martha. I would be paranoid about heating the water in my humidibucket because I would be afraid of encouraging stuff to grow in there.
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Asura]
#25939306 - 04/17/19 03:57 AM (5 years, 8 months ago) |
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Thanks for the feedback.
I was thinking of 20°C so not exactly warm, yet I hear you on the growth front. As this will only need to run for 4 mths of the year, will try a tray in the bottom and keep measuring temps.
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Bobbit
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Re: Doh, Martha Mist-akes [Re: Bobbit]
#25945003 - 04/20/19 02:41 AM (5 years, 8 months ago) |
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So today I made 2 changes. 1. Added aquarium heater to humidibucket set at 20°C 2. Connected the input to the humidibucket to the GH.
This has stabilised RH. I’m hoping that there is still enough FAE. May try to use the manual calibration to lower the temperature to 17°C
Will see what happens to temps over the next few nights.
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