Quantity   Component name
1 × solar panel how much watts do I need?
1 × arduino uno stripped down Just the mega and crystal.
1 × battery Evaluation, Demonstration Kits, Boards and Modules / Evaluation Kits, Boards and Modules
1 × batter charge controller
1 × optical sensor
1 × stepper or gear motor how much torque? what is quiet?
1 × 3d printed housing
1 × magnet for sticking housing to window