DIY egg incubator and hatcher

For some time now I’ve been idly contemplating the possibility of making my own incubator and hatcher for (primarily) chicken eggs as I’ve never been completely happy with the performance of my commercially-produced ones.

What I’m thinking of for the incubator is a cabinet-style unit for the incubator with four trays for a dozen eggs each, the trays being rocked back and forth slowly so the eggs don’t need turning. The cabinet should be insulated and perhaps have a “double glazed” door on the front. Heating would be done using nichrome wire, and humidity controlled by allowing water to drip onto a sponge or into some sort of open container.
To keep the temperature even throughout the cabinet a fan would circulate the air from the top to the bottom. Vents would be required to allow circulation of air to the outside in the event that the air inside is too warm or humid.

I have it in my head that the heating could be controlled by an Arduino using 1-wire temperature sensors placed around the cabinet. It could also manage the humidity, again using 1-wire sensors and perhaps drive a peristaltic pump to add water from an external reservoir to increase humidity if necessary. I’m not sure if the vents could be controlled by the Arduino as well, but it may well be possible. There could be an LCD display giving temperature/RH information as well as showing a countdown to when the eggs need moving to the hatcher, an alarm for temperature/RH being out of bounds and any other problems I think of and a menu system for selecting pre-programmed profiles for eggs from different birds.

The cabinet shell may need to be made from wood, but I’d aim to 3D-print as much of the rest as possible including egg trays, dividers, fan ducting, parts for the pump and so on. Perhaps the cabinet could be plastic. I’ll have to see what dimensions of plastic sheet are available.

I’ve not really thought too much about the hatcher yet, but one thing I’d like to incorporate into that is a “hatch cam”, so perhaps one of the newer Raspberry Pi models with wifi might work better for controlling that. I don’t imagine it will be too dissimilar to the incubator though, but with a clear lid this time.

Time for some rough sketches I think…

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Swimming, 19th December 2018

Another session swimming with my daughter today, and we both did pretty well. I reduced my recovery time for today’s set by five seconds and completed it relatively comfortably, though I was getting quite tired for the last two or three.

Same set tomorrow and if that also goes well then I’ll reduce the recovery time further.

USRPT distance this year: 82,300m
Total distance this year: 185,800m

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Swimming, 18th December 2018

Good day, today. For the first time I managed a full set, though far slower than I want — probably somewhere around 14 minutes slower. I can at least start working on improving the times now though, and I shall start on that tomorrow if circumstances allow.

USRPT distance this year: 81,100m
Total distance this year: 184,000m

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Swimming, 17th December 2018

Today I went to the pool with my daughter so she could also do some training. I’m almost back up to the full distance I would normally expect to do now, though still a little on the slow side. Hopefully I can make inroads on that this week.

USRPT distance this year: 79,900m
Total distance this year: 182,200m

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Building an observatory. Construction #32

The weather this weekend was quite wet and windy, but I managed to get out early(-ish 🙂 on Sunday to start fixing the northern gable in place. Everything went quite nicely to plan in terms of rolling the roof over the warm room and fixing everything from a ladder with the exception of the rain that started to fall once I’d done about half the job. I decided to stick with it and finish off, finally getting the roof closed up again about five minutes before very heavy rain started (though I was already soaked at this point anyhow). I also found an old door to temporarily prop in place to keep most of the rain out of the doorway.

The photograph below was taken well before sunset, believe it or not. The sky was just so dark.

Next steps are to get the ducting for the wiring to the piers into place under the floor, get the lower sections of the piers themselves in place and put insulation between the joists in the warm room. Once that is all done I can start putting the floor down.

[Edit: some additional photos taken during the day to show progress]

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Swimming, 14th December 2018

Well, swimming five days in a row now. That’s a first for this year I think. Perhaps it demonstrates how much fitness I’ve lost by having three weeks off 🙁

Anyhow, same stuff as yesterday, but happily I’m not feeling as tired this evening. Maybe it’s having an effect at last. Two days off over the weekend now whilst I decide what to do next week.

USRPT distance this year: 78,650m
Total distance this year: 180,550m

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Swimming, 13th December 2018

Same story for today as previous days this week. Just getting used to swimming again.

USRPT distance this year: 77,650m
Total distance this year: 179,150m

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Building an observatory. Construction #31

A little more progress yesterday evening…

I’d measured up for the north-east gable once, but when I came to check the measurements over they clearly couldn’t be right. The pitch of the roof wasn’t anywhere near the same as the southern end and that worked out fine. So I measured everything once again, this time clamping bits of scrap timber into place to give me marks to work from. My second set of measurements came out to within a couple of millimetres of those for the south-west gable, which pleased me greatly given how such a large roof frame was welded together sitting on saw-horses on my drive.

Happy with the measurements I cut the final sections of OSB to close off the gable and they’re now sitting inside the observatory waiting to be fitted this weekend. They’d best be right, as all I have left of the 20sqm of OSB that I bought or had sitting around to use on the roof is in small pieces that probably wouldn’t even cover 1sqm.

I’ve decided to try to avoid climbing onto the warm room roof to do most of the fitting. I reckon if I open the roof about 1/3rd of the way then I can hold the OSB in position and fix most of it from a ladder propped against the end wall of the warm room. If I struggle to reach the ridge then I’ll push it closed and just do the last few screws from the warm room roof. Saturday isn’t looking too clever at the moment weather-wise (again) unless I can get up and out there at the crack of dawn, which really isn’t me. On the plus side, the rain all appears to be coming in on southerly winds, so if I can’t get the membrane on until Sunday the OSB should still stay dry.

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Swimming, 12th December 2018

Another easier session today, but still building up from the previous one. It must have been harder, too — I could feel the heat being generated in my lats as I was driving home afterwards.

USRPT distance this year: 76,650m
Total distance this year: 177,750m

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Swimming, 11th December 2018

Another session to get back into swimming again today. Slightly better than yesterday perhaps, but still astonishingly hard work.

USRPT distance this year: 75,650m
Total distance this year: 176,350m

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