How to achieve Better power consumption (operation of automatic chicken coop door)
If you dont want to use arduino.look at the rough sketch 
 if you wish to make this then i would post the exact schematic.

Alarm clock would make an alarm at a preset time.the alarm would trigger a IC555 then that would clock the CD4017 one of the first output of CD4017 would go high and that is given to a diode and the another diode is connected through a limit switch if the door touch the forward limit switch the the motor must be stopped (diodes are wired as AND gate during normal operation the output of gate is 1)