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I made one for my birds.

 

i used a light sensitive switch from maplins which can be run to be normally opened and normally closed depending on how you wire it up. This was wired in to a DPDT relay which would alternate the running of an electric motor (also from maplins) to open and close the doors. Each loop from the relay to the motor was wired in to a switch at the top and at the bottom of the sliding door to cut the motor once the door was either closed or open. The only problem i encountered was my door being made of slate which would cause the motor to relax once it reached the top switch and making the circuit again meaning my door bounced in the up position. To counter this i fitted a latching relay to be activated the up switch cutting the power to the motor and staying cut. Then the bottom switch would reactivate that relay when the door closed which didnt matter as that particular circuit had been broken by the light sensitive switch.

 

This worked really well through the summer but when it got dark i found i was locking my ducks out all the time as they dont mind the dark so i abandoned it and have just bolstered up my run and leave the door open all the time now.

 

If you make the door out of somehting light, like thin sheet of aluminium it would work fine without the latching relay and would be quite a simple circuit.(i'll draw one up in cad at lunch n post it somewhere). I wasnt going to dismantle my house to change the door though.

 

that cost me about £30 to make although i did buy a soldering iron and a load of wire which you may already have. I ran it all off a car battery that i had spare but you could easily run it off a an old 12v charger plugged in to your mains.

 

Jon

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