How do I make an automatic door opener/closer for a chicken coop that opens in daylight, and closes at night?
The trouble is, one night I forgot to close the door into the coop and they all got eaten by a fox.
I've seen automatic opening/closing devices for sale, but they're really expensive.
An example of these devices can be found on http://www.axt-electronic.de/index1.htm
Any help greatly appreciated.