Step 3: Install PC fan into cooler

This is a 'forced air' type incubator, which mostly means there won't be cold and hot spots inside the incubator. You don't need much of a fan to accomplish this: a simple PC core fan will do the job nicely.

I have used a hot glue gun to attach square legos to the back side of my fan, as spacers, so the fan isn't smack up against the wall of the cooler. You might use a bit of the leftover styrofoam from the lid, if you like, instead. For this fan, I have tried attaching it to the wall with bits of wire hanger. I find this allows a lot of vibration and thus more noise than necessary, but I have not yet found a tape that will stick to styrofoam, so there you go. You can experiment with how to best attach the fan to the wall. I like to attach mine so it blows across/above the light bulb, moving the warmed air.

Cut the jack off the end of the power cords on the fan. Poke a hole through the wall of the cooler, just large enough to run the wires through to the outside. Strip the ends of the red and black wires, about 1/2".

For power, you need a 12V transformer. Any old 12V 'wall wart' transformer will do: I have used one from a long-defunct baby monitor, and one from a phone charger. Cut the jack off and separate the two halves of the wire (You will end up with black and black with white stripe, or similar). Separate the two a few and strip the ends about 1/2".

Plain black goes to red; black with white stripe, goes to black. Yellow is ground and gets nothing, although you may wish to just put a bit of electrical tape over the end anyway. Twist the stripped wires together and cover with wire nuts or with electrical tape. Plug in and test. It should run smoothly and near-silently.

This is a great Instructable, but you need to add a main image of the final project to the intro step. Please do that and leave me a message when you have so that we can publish your work. Thanks!
<p>hi, boss I failed to get a Styrofoam ice chest in my country, can I use ice cooler that has the outer part made from plastic (the outer part of it is made from plastics)?</p>
I think anything that's insulated and can hold a steady temperature will work. I now recommend buying an actual incubator disk thermostat, as it will hold a much more precise temperature than a water heater thermostat, but I did manage to hatch eggs using the water heater one.
Would you suggest using a dimmer switch
I don&rsquo;t know if this is still an active article or not, but will try. --- A lot of very good information. I am wondering, if when calibrating a hydrometer using the method of a saturated salt/water solution, how accurate will this be at various temperatures, especially around 100 degrees F. TNX
The honest answer is, I don't know. I now use an electronic hygrometer/thermometer (like Oregon Scientific) - the kind you'd use inside your own house. I try to incubate around 30-35% humidity until the last 3 days, when I bump it up to about 70%. I get very good hatches from local eggs that have not been shipped. My suspicion is that as long as you're in the ballpark, healthy eggs will hatch. There must be a great deal of variation in nature, after all - temperature and humidity both.
Would it matter if you put the lamp and fan on the lid vs the side?
I think the important thing is to have the light bulb not touch the window, the walls, or the lid. The higher the bulb, the more the air will have to be forced back down to where the eggs are. Whatever else you do, make sure the temperature is stabilized at as close to 99.5 for at least a day inside your 'water wiggler' on top of an egg carton or however you choose to incubate the eggs *before* you put any eggs in. The temperature near the lid will always be higher as the heat rises significantly.<br><br>I have never tried putting the bulb on the lid.I can't think of a good reason not to.
I like this instructable because since i made one of these i made over 40 chickens and still hatching ducks!!!!!
What did the internal temperature of the water wriggler range from?
I have seen the internal temperature of the wiggler range between 97F and 102F without harm to the chicks. I aim for as close to 99.5F as possible. Put the wiggler at the same level as the eggs (I have even laid it on top of the eggs). If you lay the wiggler on the floor of the incubator, but use the egg-carton method of incubation, so some eggs are tilted up and some down, you'll find that the temperature in the wiggler registers as much as 2 degrees less than the eggs are getting a few inches higher. It's really amazing how much of a difference a couple of inches make, even with the fan blowing in the incubator. I have toyed with the idea of trying to make the fan blow down at an angle but have not accomplished it yet. Anyway, if the wiggler is at the same level as the eggs, it will record the correct internal temperature for the eggs at that elevation in the incubator.
I know what your saying. What I actually did was raise the platform for the eggs up a couple inches and lowered the fan to match the height of the platform. By doing this I also increased space for more eggs. It was a double win.
Hi, I've been working on my incubator for a couple of days now and am having a problem with the temperature fluctuating from as low as 93.3 clear up to 103.3, bad thermostat? (i'v tried placing it behind and infront of the aluminum and still have problems)
Which kind of thermostat are you using, the 'lower thermostat' for a water heater, or a disc thermostat designed for incubators? I eventually gave up on the water heater thermostat because of similar temperature swings and wired in a disc thermostat:<br><br>https://www.gqfmfg.com/store/comersus_viewItem.asp?idProduct=147#<br><br>I find as long as the thermostat INSIDE THE WIGGLER stays between 98F and 102F (but ideally as close to 99 as possible - I mean, brief spikes to 102 have NOT killed my whole hatch), it's okay. I've hatched 6 or 8 broods out now using the same incubator but with the disc thermostat.<br><br>The more water mass you have inside the incubator, be it the water tray underneath for humidity, a couple of small bottles of drinking water, or a larger quantity of eggs, the more stable the temperatures are going to be. I've been experiencing problems with the end of hatch, as I take chicks out and the reduction in mass inside the incubator seems to confuse things. I have now 3 different indoor-outdoor thermostats with probes inside the single wiggler. They each register slightly different temps, and I average the 3.<br><br>However, a 10 degree fluctuation definitely needs adjustment and possibly a better thermostat.
You've only done one duck? Wouldn't it make sense to hatch as many as you can even if you just sell them? I'm definitely going to make one of these. I and a neighbor have been discussing buying one to share but this would be so much more convenient and cost effective. Thankyou very much!
Hi there I have 1 rooster and 11 hens and there all laying and i'm eating them and I had an idea and I was thinking breed for money. Awesome<br>
on the wire floor add 4 inches to the width and length after your measurements, that will add the 2 inch fold .
Doesn't the humidity cause problems with the electrical items (fan/light fixture/etc)?
I can only tell you that I have never yet run into humidity problems. But most of the time the humidity is 50-60%. It only gets a little higher during hatching. I imagine that the humidity is higher in many parts of the United States all summer long, and I have never heard of problems with electrical fixtures there either.<br><br>You're more likely to run into humidity problems in the eggs themselves - too much humidity through the incubation process, and the chicks won't hatch properly. Or they may drown when they pip internally (break into the air cell, which by hatching should take up at least 1/4 of the volume of the egg). If the humidity in the incubator is too high, the moisture in the egg won't evaporate adequately, and the air cell won't be large enough. The chick will drown when it tries to breathe.<br><br>
hi i don,t have any account pro please send me this pdf file to saeed.bahman@gmail.com thanks
Fantastic instructable. One of the best I've ever read. Well done.
Thank you. I just finished hatching out my second batch of the year in this incubator and am picking up eggs from a friend to start another. I need to make a change to it though: I have given up on the water-heater thermostat and now am using the GQF wafer thermostat for the Hovabator incubator: http://www.gqfmfg.com/store/comersus_viewItem.asp?idProduct=98# It holds a far steadier temperature with less fussing. I wish I'd just splurged for it before.
&nbsp;What's up with the bag around the temp probe? Maybe I missed it but I couldn't figure it out.
Hi, that's actually a &quot;water wiggler&quot; toy, meant to simulate an egg. The probe goes into the wiggler; the water in the wiggler reaches and sustains the desired temperature; then you know the content of&nbsp;your eggs will also reach and sustain&nbsp;the desired temprature.&nbsp; You can also purchase &quot;eggs&quot; on Ebay that will perform the same task. People have done all sorts of creative things, like blow the contents out of a real egg, fill it with dishwashing liquid, seal the ends with the temperature probe inside, and put that into their incubator....<br /> <br /> I found that water wiggler toy at a local specialty toy store, but they can be purchased in many places, such as local WalMarts.
You should an egg carton to hold your eggs in, so that they are staying straight and not harming your specimen.
leaving it straight up the whole time WILL&nbsp;HARM&nbsp;IT.<br /> <br /> u have to turn the eggs a few times a day at least<br /> <br />
However! You can put the eggs in an egg carton, small end down, and put a block of styrofoam or what-have-you under one row of eggs (that is, along one long side), and then under the other, at least twice a day. This accomplishes the same thing as 'turning them', and&nbsp; there is no chance you might accidentally drop an egg (as does happen sometimes when you turn by hand). Also, moving the blocks can be done quickly with little heat loss to the incubator, versus the time needed to turn each individual egg.<br /> <br /> I have successfully hatched eggs using this method of tilting the eggs from side to side.
I've spent ages recently looking at creating an incubator, your's is a good example and I'm sure works well. I'm now somewhat obsessed.<br /> I've decided to over-engineer mine as much as possible with automatic thermostat control, fans etc. I work from 6am until 7pm away from home, so want to automate as much of the process as possible. I also want to make it large enough to use as a small brooder as the controlled temperature and seem a good idea.<br /> I'm also going to try and build an automatic egg turner, which is where I'm struggling. I think some Arduino experts may be able to help. Have you any thoughts on automatic turners and how to go about it? They'd make a great addition to any DIY Bator.
I'm afraid I don't know anything about making an auto-turner, but they've been discussed (right down to gear ratios et al) on backyardchickens.com in the 'incubating and hatching eggs' forum. With my own eggs, I just turned them by hand morning and evening, and got a 50% hatch rate from shipped eggs (which is average, regardless of what incubator/turning method you use).<br /> <br /> Good luck!
I did look on backyardchickens.com but they all seem to be talking about much larger systems.<br /> I have come up with a cunning plan however, which involves a servo motor with a simple controller that tells it to tilt one way, wait 4 hours, then tilt the other way.<br /> Now all I need to do is learn electronics, soldering, PIC programming and fabrication of the egg turner. EASY!
Thank you so much for this instuctable!&nbsp;I am so glad that i found this site.<br /> I&nbsp;have been looking for a 'how to' on making a cheap incubator, and this is just perfect!&nbsp;I think i am going to make this (i just have to ask my dad, but i think he will say yes). Thank you for putting pictures up with your step by step instuctions, if you didnt then i would be very lost.<br /> Beautiful job, keep up the good work!
You're very welcome. the first one I made, working from less detailed instructions / zero pictures, took me HOURS. I&nbsp;hope this will only take you a couple of hours, and not cost much.

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