designed by David Johnson, P.E.
Last Updated on:
Monday, December 25, 2017 02:06 PM
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Chicken Coop Door
Opener with Timer
March 18, 2013
I received an email from a guy in
Australia who was trying to build a chicken coop system. He was planning on using
a conventional garage door mechanism to open and close the 6 doors to the coop.
The commercial door opener opened and closed the doors with a single pushbutton.
He wanted to install a standard 220vac powered timer so he could open the doors in the
morning and close them at night. He was not sure how to perform this function.
I suggested the circuit shown below.
It uses an off-the-shelf AC to DC power
adapter, a pulse generator circuit and a reed relay. The relay contacts are wired in
parallel with the door opener pushbutton. Every time the timer turns on the power
adapter, the relay would activate for about a second or two. When the timer turns off,
the capacitor C1 is discharged. I suggested a 12v power adapter and a reed relay with
a 1K coil resistance. For 120vac systems, a 120vac timer and a 120vac powered adapter
would be needed.
Drawing Below to view PDF version of Schematic