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Last Updated on: Friday, November 17, 2017 06:32 AM

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More Timer Circuits
 

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.

Click on Drawing Below to view PDF version of Schematic

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