The present disclosure provides an integrated circuit design method. When a user pushes the control sleeve so that the control sleeve is forced to shift toward the adjusting portion, the user can rotate the control sleeve to simultaneously actuate the adjusting portion, so as to adjust focuses of the left and right lens systems. The conveyor disk has at least one recess at the outer periphery for the reception of at least one grain to be separated via at least one revolution of the conveyor disk. Plants like legal cannabis for medical use can be grown in plant areas near the raceways with very high yields.