Author Topic: Just installed my new temperature and humidity controllers  (Read 724 times)

Offline MAK

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Just installed my new temperature and humidity controllers
« on: February 15, 2014, 12:21:06 PM »
Hello,

I wanted to show off my new temperature and humidity controller.  This was a fun DYI project.  Seems to be working good.

Dave


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Offline graysalchemy

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Re: Just installed my new temperature and humidity controllers
« Reply #1 on: February 15, 2014, 03:08:20 PM »
Nice set up.  :)

I have a temp controller but no humidity controller. :(

Did you use one of these and an stc100 for temp control?

Offline MAK

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Re: Just installed my new temperature and humidity controllers
« Reply #2 on: February 15, 2014, 03:34:20 PM »
Nice set up.  :)

I have a temp controller but no humidity controller. :(

Did you use one of these and an stc100 for temp control?


Exactly.   I have a humidifier on the bottom of the refrigerator connected to an extension cord that is wired to the controller.  I have it set between 80% - 85%.   So far it seems to be working fine.   

Can I expect an unforeseen problem? 

Offline graysalchemy

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Re: Just installed my new temperature and humidity controllers
« Reply #3 on: February 15, 2014, 03:51:27 PM »
I may get one of them they look quite good and cheap as chips.  :)

Online John@PC

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Re: Just installed my new temperature and humidity controllers
« Reply #4 on: February 16, 2014, 09:33:17 AM »
Great job on the project Dave.  For anyone who may not have the knowledge or desire to DIY we do make (here in SC, USA) and sell fully-wired ready to use systems (temperature and humidity) and also have just started offering a 2-stage (2 relay) controller for people who have their caves in unheated areas.  Like you we use the WH8040 humidity along with WH7016's temperture controllers and buy them direct from Willhi in Shengzing.  Originally we had a "dual" unit with both (temp and %RH) controllers in one box but found the cost wasn't that much more than for separate "boxes", and there were several advantages like using the temp controller for other applications like heating milk and cooking sous vide.   I won't go into any more detail for fear of the forum advertising police knocking at my door  :o but for those that are interested there is more info on the links.  A picture of my DIY / DIFO (Do-it-yourself and Do-it-for-others :)) controllers on my cave set up are attached. 


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Offline retrojim

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Re: Just installed my new temperature and humidity controllers
« Reply #5 on: May 15, 2014, 12:50:15 PM »
Nice job!

I'm using an old small wine fridge for my cheese cave, and it doesn't have any temp or humidity displays. Since one of my other hobbies is electronics I looked through my junk drawer and found enough parts to build a temperature and humidity display using a DHT22 temp/humidity sensor. First thing I noticed was that my wine fridge was running too warm, so now I've got it down to 55 degrees F.

The next problem I need to solve is humidity. Putting a container with a wet sponge in the bottom of the fridge is wildy inconsistent depending on where I put the sensor, but I have't seen it get over 60%. My solution is to raid my junk drawer again for a small fan that I will place over the sponge container to circulate the moist air. I have a fan that runs pretty gently so it shouldn't disturb any mold cultures. Once I get the humidity up I'm going to attempt some St. Marcellin. I've only aged hard cheeses in the cave so far, mostly waxed cheddars.

Since I'm using a small AVR micro controller for the sensor and display I'm going to hook up the fan to it as well so the micro controller can turn the fan on if the humidity drops below a set point.

Total material cost of this project was $0 since I had all the parts lying around, but if I had to buy them it wouldn't be much more than $20. The most expensive part is the 2 line backlit LCD display at about $10. If I really want to get fancy I could hook up an IO pin on the micro controller to an AC relay, put the fridge on high, and let the controller cycle the power on and off to control temperature too, but I don't think I need to do that yet.

I love it when my hobbies cross pollenate!

--Jim