We started out with some cute baby chicks (5 to be exact) in late March. Well that lead to building a 4'x4'x4' chicken coop, which lead to me opening and closing the door every day to let them in and out............. It got old quick so I figured there had to be a better way. I searched this website for options. I'm frugal (i.e. CHEAP) so I wanted a very inexpensive way to make the door open and close automatically. I saw all the $200+ options and thought NO WAY! I finally found some people and some videos on Youtube that show how to make an automatic door with an electronic car antenna. I got an antenna (actually two of them - one for a spare) at a junk yard for $10 bucks. I figured it was worth a try. I also had a couple power supplies that were no longer in use that happen to be 12VDC (one is 1.2 amps, the other 1.3 amps). I rigged it all up as this person shows in great detail https://www.backyardchickens.com/a/automatic-pop-hole-opener The nice thing about this is that the antenna must be able to feel when the door stops, so the motor that drives the antenna stops as well. The antenna DOESN'T have to extend the full distance. It will stop and turn off when it feels the pressure of the door stopping. You can see that in my video. I modified his plans a bit - My door goes horizontally and my power supplies are different from his. I couldn't find any power supplies like is ANYWHERE! Fortunately I had a couple of my own from stuff that must have been thrown out or died. I cut the tip off the end of the antenna and crimped on a terminal ring connector. All the wires are hidden inside protective wire wrap (just incase the chickens decide to peck at the wires! I made this video just a couple hours ago and then decided to make one more modification to my plan - I now have a night light plugged into the timer that will turn on when the door closes and off when it opens. Now I will be able to see from the house to verify that the door actually closes. So at about 10PM the door should close and in the morning at about 6AM it should open. We will see what happens............ Seems like a good investment of $5 bucks and about 3 hours putting it all together. On top of that I'm not an engineer or builder. I just looked at the other guys plans (link above) and figured out how to make this work in my coop. It's so easy ANYONE can do it! Here's a link to my video from inside the coop: And here's a link to the video of the door closing at it's "close time" and the night light turning on from outside of the coop: The door worked great tonight. It closed a couple minutes after 10PM and the night light inside the coop turned on! Looks like a winner and will make my life easier!