The blinds are moved up and down using servo motor. The motors are optoisolated using 4N35 isolaters and powered by a ULN2003A Darlington Array. The stepper motors are used because of their accuracy since the blinds are expected to stop at specific positions depending on the user's previous preferences. They both drive a single gear that increases the torque in the system, allowing shades to be reaised smoothly. Spools are used to roll up the string that holds the window shade. Pulleys are used to redirect the force of the pulling so that the single gear and rod are able to raise and lower the shade. The string goes through the holes of the original window shade frame, so that its outside appearance looks exactly like a normal window shade.
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