I need to make a light mover for my vivarium. Instead of using two lights-one on each side-I want one light on a trolly to move back and forth, over and over again, with a pause of approx. 10 to 30 minutes on each far side, I have two large plants on each side of the cage that need the most intense light. It doesn't have to pause at each end, but it would be ideal if it could. Remember the motor needs a second or two delay before switching polarity so it won't damage the motor. My diagram shows the easiest thing that I could come up with, but I would rather make a timer circuit or something. The 30 rpm gearmotor is 12 VDC and less than 2 amps. Thanks in advance for any help.