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G'day fellow workshoppers,
Finally got around to designing, building and installing the new auto door for our girls. I was quiet shocked at the price of purchasing a pre-built opener, but I've put together a price list and can understand why these items are expensive. Anyhoo, I will attempt a how-to on this project.
Here are the parts required for the build that I put together. Motor, photocell, double pole double throw relay, timer, transformer, micro/limit switches and an enclosure to put it all in. (The black transformer may be used as an alternative).
I had to make a shaft for the motor so as to lift and lower the door. I decided to use a bolt with a hole drilled in the end to suit the shaft. A couple of very large washers and nuts and a smaller bolt tapped to lock onto the shaft as a key.
Time to put it all together. Wiring is via the diagram attached below. I also decided to install some LED marker lights I had as surplus to come on just prior to dusk and turn off after a couple of hours (photo upside down for some reason). I did a test run at this stage to ensure it worked.
The following is after installing on the coop. The little pulleys allow the door to open/close without binding.
The rope is just plain 'gunline' and is not prone to rotting. I will probably replace this with something more permanent in the future.
Last but not least is the placement of the micro/limit switches which shuts down the motor when either in the raised or lowered position. In this case I used a long bolt and positioned the switches to allow activation.
Here is the wiring diagram. It may look a bit intimidating but it is foolproof.
If anyone wants a PDF version, just let me know. Also if you have any questions, please don't hesitate.
Nearly forgot the price list.
24v DC motor with 48RPM reduction gearbox - $10.80 (ebay)
Photocell - $3.26 (ebay)
Relay - $4.70 (wholesaler)
Timer - Free but can purchase for under $20.00
Transformer - Free but approx $20-30 on ebay
2 x Limit switches - $12.00 (wholesaler)
Enclosure - $32.00 (wholesaler) but can get much cheaper without clear lid.
Cable, connectors and misc stuff - Approx $5-6
Labour not considered (approx 4 hours to put together, test and install).
Considering a pre-made purchased unit costs upwards of $250.00 - $400.00, I think I made the right decision making it myself.
Cheers'n'beers
Daryl
@Lpreciado There are several ways to wire a photocell into your door opener. Here is a very simplified way to do it. I reduced the Photocell down to just a switch for clarity AND because there are a few diffent Photocells out on the market, that to try and predict which one you will choose is impossible. So here it is. Let me know if you have any questions. I also added a Timer/Photocell selection switch. This gives you the option of using the Photocell, a Timer or Manual operation in the timer.
P.S. If or when you buy your photocell and/or timer, post a pic of them and if possible the scematic and I could add it to this scematic to help you wire it up.
@Mouthpear If only I was tech savy to be able to set things like this up. Your a clever fellow.
I'm still battling with setting up another work bench, this one will be mobile when needed and accomodate bench saw, router bench and scroll saw. Then have it all hook up to a remote control *(haven't figured that part out yet) dust extraction unit. 
@Fyastix I am so sorry that I never saw the post of you asking about a parts list.
12V DC
1 Actuator with internal limit switches
1 Double Pole Double Throw Relay
1 Timer TM-615
If you are going to use a 12V DC motor and not an actuator you will also need
2 Diodes
2 Limit Switches.
However I have since rediscovered a better way to wire this. As I was explaining, in another forum, how the door locks and windows worked in a car, it Hit me like a light bulb and turn on like a ton of bricks.
All you need is
2 Timers TM-615 or 1 Timer TM-612
1 Actuator with internal limit switches
The wiring goes like this:
.
If you are going to use a 12V DC motor and not an actuator you will also need
2 Limit Switches.
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