In this Instructable I'll be showing how to make an easy automatic chicken coop door opener.

For anyone who keeps chickens, the ever present threat of predator animals like foxes is always a worry. We recently had all of our chickens (4 of them) killed by a fox and as you could imagine it wasn't a pretty sight. Usually when something like this happens its due to human error, like leaving the coop open. I wanted to ensure that this didn't happen again and so started investigating automatic coop doors. There are quite a few on the web, many expensive or just plain complicated. After much searching I finally stumbled across one which seemed like pure genius.

The door is lifted and closed by an electric car antenna which is activated by a timer. Simplicity itself! Electric antenna's are easily available from any car wreckers for next to nothing, and it's a great way to re-use something that just going to be land-fill anyhow!

There are a few versions on the net on how to make this door opener. I noticed though that they all used a couple of computer charges to power the antenna which made it complicated. My version uses a timer and battery and keeps everything simple.

The reason why I have included the word "simple" in the title is this really is an easy build. If you do a quick search on the net you'll see a bunch of builds which either cost a heap or seem really complicated. This project can be done for as little as $20 if you use mains power.

The following Instructable will take you through how to wire-up the timer and antenna and also how to mount to the door.

Your chickens ill thank you!

I've also included a short video of the door in action.(if you are using a mobile, try this link)


Step 1: Things to Gather


1. Electric car antenna - you can get these from your local wreckers if you have one. Alternatively you can get them on eBay

2. Timer - I used this one from eBay

3. Power supply. You can use either a 12v battery or a 12v power source. I went with a 12v battery so if there were any power outages then it would still keep on going. The battery I scavenged was also from the wreckers and only cost me $10

4. Various wires

5. Terminal Strip - eBay

6. Screws.
- Small ones (they need to fit into the C channel
- Larger ones to screw everything together

7. Aluminium C channel - Hardware store

8. Voltage Meter - eBay (optional)

9. Small switch (optional)

10. Solar Panel - eBay

11. Solar regulator - eBay


1. Bench Saw

2. Hot glue

3. Soldering iron

4. Super Glue

5. Drill

Hello I was wondering what the demand on the power display/charge was with or without the small switch you have set up. What were the search details on the switch you have for ebay? Thanks
Hey there,<br>I believe it's about a 10-15mA draw so very minimal. If you really wanted to you could have the LED display on all of the time and it would hardly make a dint in the batteries power reserves
Thanks for the great instructable! It works great. I used a pulley system to reduce the travel distance and strain on the motor. The rope is attached to the tip of the antenna using a rope fastener. Is there any way to make it where the antenna stays up, but doesn't use any power?
<p>I might be completely wrong (correct me if I am) but could you just not mount the antenna at the top and have it need to extend when it closes, which yes will still consume power but will be less because chickens go to bed from sunset to sunrise and if you set the timer right for the shortest night you have it set open for the shortest amount of time.</p>
Yes you can do that (that's what i did), but when the antenna is extended (door closed), it's drawing power. If you're using mains power then this won't be an issue. If however, you use solar, then if you live somewhere where the winters a long, then you might have an issue. Having the antenna extend to open the door means it is drawing power during the day and you should have plenty of sun (hopfully!) to charge your battery.
Great solution! Yeah the antenna drawing power is a slight problem. There probably is a way for it not to draw power when it is extended but it's beyond me. Thinking back, I should have really have made it so the antenna extended to open the door. This way the battery would have kept charged during the day from the solar panel.<br>How are you powering your antenna?
<p>I'm using a solar setup for power. My battery is only 5Ah, I should have gone a little larger, but it work for now. I'm not the best at wiring, it took me a while to figure out my timer. Its not the same one you used. But I was thinking of trying to use a secondary timer to kill the power to the antennae after the door closes. Does that sound possible?</p>
<p>I don't think that would work. The &quot;signal&quot; wire on the antenna needs to have power to it constantly when it is extended, if you added a timer to shut this off, the antenna would just retract. It's kind of like when you start your car and the antenna extends. It stays extended as long as the car is on. Once you turn it off, the power is removed from the signal wire and it retracts.</p>
Probably crazy talk but... What if I ran the ground wire through the second timer? That way it kills the power to it and it stays up.
<p>Yeah it might work. If you did kill the power to either the positive or negative once it was down, then it should stay down. </p><p>Let me know how you go.</p>
<p>Londesoulsurfer &amp; KSpoon1....did you guys have any luck with the new wiring? I'm considering doing something similar with some sort of cutoff switch and another timer so I can extend my battery life, but I'm struggling with how to do it so my door remains in the proper position when it's not receiving voltage from the battery. </p>
<p>I haven't gotten around to adding my second timer. Mosquito's are HELL right now! My plan tough, is to have the second timer kill the main power lead. The timer now is connected to the wire that triggers the antenna. I think that should work. Sorry for the delay getting back to you. Flawless operation thus far!</p>
<p>Did you ever figure out if this would work or not? From my understanding, these antenna take 2 hot wires, one for the antenna itself and one for the motor to extend. What you are talking about is killing the power to the antenna while keeping power to the motor that extends?</p>
<p>I will have an answer this weekend about wiring up both a timer switch and a timer switch relay (like the one in this instructable). I just got my new timer switch yesterday and will install it this weekend.</p><p>My plan is to wire everything up as described in this instructable (except the solar stuff because i don't use solar) and simply put my new timer switch between the battery and the existing timer switch with relay. I plan to let power flow for a couple minutes in the morning and a couple minutes in the evening. With any luck, this will extend my battery life dramatically (hopefully i can go several weeks between charges instead of several days).</p>
<p>OK...I'm pleased to announce that adding a new timer switch on the positive side of the battery terminal is working like a charm.</p><p>I have my 2nd timer switch setup to power on for 1 minute before my door is scheduled to move and it kills the power 1 minute after the antenna starts. </p><p>I know the car antennae do not use a lot of amps when idle, but now I will be using zero amps except for 2 minutes in the morning and 2 minutes in the evening. This ought to greatly increase the duration between battery charges.</p>
<p>Was just browsing through this. Since you have 2 timers running, would it be better to let each run the full operation? Run hot and control through one timer which would extend the antenna. Run just hot through the other timer which would retract the antenna. One runs for 1 minute in the morning, the other runs for 1 minute in the evening and you don't ever have to worry about syncing the two up.</p>
<p>I would like to integrate a photo cell, if that can be done. Does any one know how that can be done and how to wire it? Thanks in advance.</p>
<p>How would you go about hooking this up to grid power? Could you just use a 110v AC to 12v DC converter like this one. <a href="http://www.amazon.com/Schumacher-PC-6-120AC-Power-Converter/dp/B0012BL8LG/ref=sr_1_1?ie=UTF8&qid=1444142136&sr=8-1&keywords=110v+ac+to+12v+dc+converter" rel="nofollow">http://www.amazon.com/Schumacher-PC-6-120AC-Power-...</a></p><p>That one outputs 6 amps DC, would that be too much for the parts you used??</p>
Howdy,<br>Yep there would be no problem using that AC adpater. The battery I use is 7amps so 6 will be fine. I'd probably just use a 1 or 2 amp one though just to be safe.
<p>What is the power requirement for that programmable timer? Some milliamp value? I see it says 'Power consumption:7.5VA (MAX)' on the amazon page.</p><p>I wonder if just an external hard drive adapter would work like this - http://www.amazon.com/Wall-Adapter-Power-Supply-12VDC/dp/B006GEPUYA/ref=sr_1_4?ie=UTF8&amp;qid=1444323242&amp;sr=8-4&amp;keywords=1+amp+ac+dc+adapter</p>
<p>Timer clock operates on self-contained batteries. </p><p>The switch will operate using 12 volts (might even operate on lower voltage, but mine is setup to run off a 12 volt battery).</p>
<p>I just made mine today. I have no electrical background and I used everything you had with the exception of the voltage meter. I did modify my mounting and built it to be within its own cabinet. I need to mount on the outside of my coop to get the height. The cabinet then will be closed with a door to allow access from the outside (not shown in the photo, not attached yet). I also had a few odds and end bracket clamps and an old kids gate screw with the foot to attach to the door (door not attached). My husband had electrical wire extenders to allow more length to attach to the timer. My antenna wires were very short. The white board that I have the timer and regulator attached is removable to allow future modifications or maintenance. Thank you so much for the photos and ideas. My hens will not be much safer since I occasionally forget to close them up. Oh, also, when I need to override and open and close the door, I just cycle through with the manual button. Again, thank you.</p>
<p>That's Awesome! It's good to see that you were able to use the info in the ible' to make it successfully. Means it makes at least some sense :)</p><p>How did you attach the bolt to the end of the antenna? Looks like you have a secure connection. I have had to re-do mine recently as the solder point become weak and broke off. I've done away with the solder altogether now and have drilled a hole into the actual bolt that goes onto the end of the antenna. </p>
<p>My antenna end tip is not rigidly fixed to my door. Due to space, it fits loosely to my door and the antenna keeps extending even when my door is shut and no longer moving. When the door opens, the antenna runs about a foot before it catches the door and begins lifting it. </p>
<p>it is two flat pieces of metal with a hole in the center. I sandwich the antenna between them and run the bolt through. Tighten. It has come out twice but if I epoxy it between the metal pieces, it would not come out. The only thing that happened was they didn't get to run around that day. Sorry for the late reply. </p>
<p>I meant....NOW will be safer</p>
What kind/size battery did you use?
just read what you posted in the comment area about what type of battery you used. I'm using the 7ah battery as well can I use more ah than that<br>
Yep don't see any issue with using a stronger battery. The anntena's are used on cards and the amerage on a car battery is definietly higher. I only used a 7ah so the solar panel would charge the battery.
<p>I'm a bit confused on the wiring. In the drawing of the wiring schematics, there isn't a terminal block. Later on you have the block added to the back, and I'm trying to figure out what you did. Do you have another drawing with the entire breakdown?</p>
<p>The terminal is there just to make life a little easier. You don't have to use it if you don't want to. If you look at the schematic, you can see that there are 2 lots of wire joining to the battery, one from the antenna and one from the timer. Using a terminal means you can join all these wires together.</p>
How heavy can the antenna lift? What size and thickness did your door measure? Have all the parts now except that i plan for using 230v through an led driver tranformer... thanks for your inspiring creativity!
<p>To lighten the load, you might consider adding a counterweight to your door. </p><p>Or use a piece of aluminum or plexiglass. </p><p>Or put your door on some drawer slides. The drawer slides will add weight, but might reduce friction enough so it's easier for the antenna to move the door?</p>
<p>Hey there,</p><p>The antenna's are geared so they should be able to lift a substantial weight. To ensure that the gears last though I would use as light possible material for the door. I used some ply wood, but a sheet of aluminium or thin steel would also be ok.</p><p>Good luck.</p>
<p>Great instructions! I don't have much vertical space above where I plan to install the coop door. Do you think this would work for the door to slide horizontally, or would it rub too much on the bottom C channel?</p>
<p>Hey there,</p><p>i don;t think you'd have any issues with the door sliding horizontally. The antenna will have enough force to easily push the door horizontally. You could add a smaller piece of &quot;C: section to the bottom of the door so it slides easily.</p>
Cool, thanks for the advice!
i would be concerned with bedding getting into the bottom track, you could look at maybe using drawer slides and mounting them near the top of the door. maybe even doubling them up. just a thought.
thanks for the plans it's looks great. what is the amp rating on the battery you went with. I see mostly 7-8 and a few 18s. just curious on what you used. thanks
<p>Anytime.</p><p>The battery is a 12v Century SLA battery which runs on 7ah</p>
<p>Hi there, great project, one which I'm starting at the weekend. Do you have the final wiring schematics including the voltage meter and push button. Sorry to ask such a basic question but I'm new to these things :) Thanks in advance.</p>
<p>Great project. I am starting my project this weekend, first the coop then the door. Do you have the final schematics including the wiring for the voltage meter and the button. Apologies if this is a daft question but I'm certainly no expert at things like this but certainly want to give it a try. Cheers.</p>
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<p>After 6 months, I finally collected all the components to make this project. The final piece was the automatic antenna, which I picked up today at a salvage yard.<br><br>When I got home &amp; connected the antenna to the battery to test it, only the first segment of the mast would extend and retract. If I disconnect and reconnect the battery, I can hear what sounds like a relay clicking on the antenna. <br></p><p>I tried carefully pulling the mast out by hand, and again, the first section extends easily, but the second section will only extend a few inches and I can't pull it out any further without risking destroying the gears. <br><br>When I hooked it back up to the battery to retract, it would still only retract that first section &amp; left the second section extended a few inches.</p><p>I don't know if it makes a difference, but the battery is a sealed 12v lead-acid battery like the kind they use in kids ride-on toys.</p><p>Maybe the battery doesn't have enough amps? Maybe the antenna spent too much time in the salvage yard? (Although it looks almost new.)<br><br>Any suggestions would be greatly appreciated.</p>
<p>UPDATE: I checked the antenna with a new car battery, and the result was the same - it extends about 8 inches and then stops, with the relay clicking. I'm guessing the mast is gunked up from lack of use, or it's just not good any more. </p>
<p>Must be your antenna. I could use a 9v battery to make mine go up and down (albeit slowly!)</p>
I've had no success with the timer, I'm on my fourth, the switching is either freezing the circuitry or the relay, even with spark suppressor and diodes I've soldered inside. <br><br>Any ideas?

About This Instructable


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Bio: I've always liked pulling things apart - it's the putting back together again that I have some issues with.
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