Solar panel tracker and limit switches?

I ordered a 12 volt solar tracking chip with 4 sensors, one on the left, two in the middle and third on the right. This will be the sensor for a homemade solar tracker with one dc motor salvaged from printer. The circuit board has two leads + and - for motor and two for power. Problem is i may want to limit the motion from turning to far to the right as the sun sets or from having it turn 360 twisting the motor when it repositions. It should stop when it hits the switch but allow the motor to turn back the way it was so it wont twist the wires when the morning sun rises. I dont think it needs to reposition it self to the start automatically since the left sensor should do it as described in listing but if it doesnt, how would i make it reposition at start point?