How to make a sliding, self-locking, and predator-proof chicken coop door (2020)
83 points
9 hours ago
| 12 comments
| backyardchickens.com
| HN
PaulHoule
9 hours ago
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We have some friends who have a really well-built chicken coop. Sometimes we help them with the birds when they are out of town and bring back eggs.

A while back they had a stump in front of the house with a family of foxes living in it and they pointed a game camera at it.

Night after night they got footage of the fox mama bringing back other people's chickens to feed to her kits.

The moral is, I think, that the well-built chicken coop is a good investment.

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dylan604
8 hours ago
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I would like to compliment the video for being useful to purpose, simple, no annoying TikTok voice over, no voice over at all as it's not necessary, no unnecessary text. It's just a simple here's the thing, here's it working, here's why it works, and here's some detail on how it was built.
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bonoboTP
8 hours ago
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Yes and I would have even seen the video, if a newsletter popup hadn't obscured the entire screen.
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eulgro
4 hours ago
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The channel owner seem to be a non-speaking person so that explains it.
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rossdavidh
2 hours ago
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I don't understand; where is the cloud connection to an LLM agent? I don't even see how you could get Kubernetes or React in this thing.
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dmos62
9 hours ago
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There's something about these basic self-locking/self-unlocking mechanisms that's so satisfying. It's like they exercise my brain in a way it's not used to exercising, like that really good stretch you do sometimes that really hits that spot. Reminds me of knots: I geek out about knots sometimes, and it's just so profoundly weird to think "in knots", I feel like an alien when I'm doing knots, or like my brain is doing cirque-de-soleil-type contortions. I guess this says something about how mundane my usual mental activity is.
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HeyLaughingBoy
8 hours ago
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I love mechanisms. It's amazing how much mechanical complexity we were able to build before the advent of computers. Even more so when you learn how very minor changes like shaving a few degrees off an angle can be the difference between success and failure. As an embedded systems developer, I've been fortunate to work with a number of talented mechanical engineers over the years and come to realize that the complexity that they have to deal with isn't that far from what we have to do in software.

If you want to think in knots, go down the internet rabbit hole of investigating how the knotter in a hay baler works :-)

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bombcar
5 hours ago
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I love how so many mechanisms revolve (hehe) around revolutions - because that's the simplest form of mechanical effort to make and use.

I also love the accuracy you can get if you work on it - I'm thinking things like those giant castle doors weighing multiple tons, but a child can push them open if unbarred.

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Terr_
8 hours ago
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When it comes to theorizing/storytelling about humanity meeting a larger galactic society, there are a lot of concepts about different species-character or specializations. I've always been interested in unusual answers to "what might distinguish us."

For a while now, "brains can think of knots" has been on that list. Imagine some aliens who are generally much smarter than us, but they need computers to indirectly create or solve knots, and textiles were a late- rather than early-invention.

Granted, this seems unlikely, but it's still amusing to consider.

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dmos62
8 hours ago
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Same. I enjoy thinking how different an alien could be, and how I'd discover things that were so constant in my life that I wasn't even aware of them, until someone completely different appeared.
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kriskrunch
1 hour ago
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I need a lock like this to prevent my hyper active toddler from leaving the house through the front door.

It'll be strange to replace my front door with a guillotine slider, but I'm willing to try about anything since I found him half a block away playing in a puddle last week.

I literally just tried to send one text message. Poof he was gone.

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paradox460
5 hours ago
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Several years ago I bought a product that aimed to solve this problem. It was a set of rails, a door, and a controller/motor that would raise and lower the door, via a string.

The door itself has a spring loaded catch at the bottom, which is retracted when the door is lifted, via a little mechanism built into the door. Pull up on the peg, the latch retracts, and you can slide the door open

The controller was the weakest part of this whole assembly. It worked, but was crude and often would lock hens out, like when summer thunderstorms would darken the sky. It just used a light sensor

Last year I replaced the controller with an Esphome device I built, and it's been going strong all summer and winter

https://pdx.su/blog/2025-06-11-how-a-simple-chicken-coop-doo...

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stickfigure
5 hours ago
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Smart chicken coop doors are sub-$100 on Amazon now.

If you want to spend a bit more and don't like "smart" doors, I used one of these for years and was reasonably satisfied: https://chickendoors.com/

In my next coop I think I want something with enough smarts to let me know if it ever fails. That is, it reports status and if the server notices it hasn't gotten a report, I get an alert.

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cbdevidal
3 hours ago
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> That is, it reports status and if the server notices it hasn't gotten a report, I get an alert.

I’m working on exactly that, called SecureCoop. Being in IT the lack of notifications on doors was a huge concern. So I (over-)built redundancies and notifications and server monitoring and clustering.

I’m still working out kinks in the prototype but I hope to be selling later this year. Need to take it to an FCC lab to verify that it doesn’t cause excess interference, and then I can sell.

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brewtide
5 hours ago
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I have a radio controlled chicken door that I control through home assistant via a hack rf. It has a reed switch placed behind the door, and a magnet attached to the door to let you know door status, with failure stating "open".

And then a reminder sent to my phone 10 minutes past dusk to shut the door, if it is still open at that time.

It's rigged but the confirmation is nice.

Edit: most of sensors run by esp32 boards running esphome. Also include a temp sensor etc, fed into home assistant

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riffraff
6 hours ago
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For those who have chicken coops: why do you have separate doors for chicken and people?

My dad used to keep chicken and they just went through the same door and we'd just open it in the morning and close it in the evening.

Other people in my home town have similar arrangements and I feel I'm missing some important thing :)

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bombcar
5 hours ago
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Separate doors make it easier to access without releasing the chickens, if you need to (they're relatively habitual and if they never use the "people door" they won't really try to).

Easier to automate a small door, and control where it goes.

It looks cooler; people like "small doors for small things" - like the half-height garage doors at Walmart for shopping carts.

If small enough, it can reduce at least SOME predator incidents (but this is minor).

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stickfigure
4 hours ago
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The dedicated chicken door can be automated. It's nice to be able to go on vacation, or sleep in, or not suddenly wake up and wonder if you remembered to shut the door.
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qup
6 hours ago
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For me: the chicken door goes into a fenced enclosure to keep the chickens safe from predators.

I don't want to enter the enclosure, so I have my own door to go in and service the coop, fetch the eggs, etc.

The enclosure has a gate when I want to let the chickens out, as well.

Having an enclosure lets me leave the house for a couple days, at least, and not feel like I've imprisoned them.

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koolba
8 hours ago
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Would a fox be able to lift the wood without the hinge lock? Say if it was just tied directly without the hinge to block lifting it.
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Loughla
7 hours ago
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If not a fox, a raccoon can.

Here's my fun everything likes to eat chickens story. When we first built our house, nobody had ever lived within about 2 miles of our farm. There were coyotes everywhere. So I spent a couple years trapping and shooting them after they ate a couple of my chickens. Then came the racoons. They ate some chickens so back to trapping and shooting. Then weasels and minks. Except they could get into the coop through the windows in the wall that were covered in wire and 6' off the ground. So, more traps. Now it's bobcats. Oh, and don't forget the stupid red-tailed hawks and BALD FUCKING EAGLES as well. No trapping or shooting those bastards.

Everything. Everything eats chickens. I'm surprised I haven't seen a damn frog eating one of them.

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Tempest1981
6 hours ago
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I enjoyed this movie:

https://en.wikipedia.org/wiki/The_Biggest_Little_Farm

Similar challenges, but attempts at natural solutions (not easy, so much complexity)

Trailer: https://youtube.com/watch?v=UfDTM4JxHl8

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emmelaich
1 hour ago
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If your interests run bucolic you may be interested in the upcoming 3h documentary "The Valley".

https://thevalleyfilm.au/

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stickfigure
5 hours ago
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It's a super cute movie but I think it's pretty heavily dramatized. The owner is a filmmaker so it was a sort reality TV project from the beginning.

Totally enjoyable watch, but I wouldn't look for real world farming advice here.

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semerda
6 hours ago
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Do you have a rooster to help fight the chaos?
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Loughla
5 hours ago
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Yes but they are usually just the first ones to get eaten. So now we keep a jersey giant to scare off the coons, and a bantam something or other to scare off the hawks/eagles.
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TurdF3rguson
4 hours ago
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The first week after we got chickens my wife comes to me upset and tells me one of them died overnight. Apparently it's covered in slime and neither of us knows what to make of that.

A few days later it happens again. Huh, so she asks some locals what the heck is going on. It turns out a big snake was getting in there and eating the chicken, but then he was too fat to get back out of the coop so he had to barf it up to escape.

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kiddico
7 hours ago
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Jesus. You bought what sounds like a beautiful place and murdered your way to a couple dozen eggs...
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Loughla
5 hours ago
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Bloodlust makes them taste better?
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Terr_
8 hours ago
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I'm not around a lot of foxes, but I imagine so: They both burrow and hunt burrowing prey, so "lift and scrape this obstacle of the way" is in their skillet.
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Terr_
1 hour ago
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*skillset, and now I'm imagining a much darker version of that Disney Robin-Hood cartoon.
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HeyLaughingBoy
7 hours ago
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Probably. I used to have a pet parrot that learned how to open its cage from watching me unlatch it every day.
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turtlebits
6 hours ago
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Probably, but it'd be pretty trivial to add some weight to the door.
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fsckboy
6 hours ago
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what's the chickenwire tunnel at the front door for? only thing i can think of is it lets the chickens see if there's a bird of prey above? but I don't know if that's something chickens are checking. or keeps certain large predators from fiddling with the door (but not large like a bear), but doesn't seem the door should open anyway
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hiroshi3110
6 hours ago
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Blocked by Cloudflare. Anyone else?
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locao
2 hours ago
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Same here. It's getting quite common for me.
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canpan
5 hours ago
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Same. Looking at your username, guessing, you are accessing from Japan too.
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catoc
6 hours ago
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Such a great personal project!

These kind of things is what the ‘www’ was created for - good vibes!

Why riddle it with ads?

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becomevocal
5 hours ago
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It’s an expensive hobby on top of server / service costs to run the site?

Source: myself through wife which is maxed on chickens and has her own site with no ads

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TurdF3rguson
4 hours ago
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It should be profitable from just the eggs (source also wife) unless you're overpaying for server costs
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catoc
5 hours ago
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Fair.

And I my point was I really like the site!

I promise to become lessvocal about the ads.

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